Renesas HD6473318CG16 Single-chip microcomputer Datasheet

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Hitachi Single-Chip Microcomputer
H8/3318
H8/3318
HD6473318, HD6433318
Hardware Manual
ADE-602-097A
Rev. 2.0
3/6/03
Hitachi, Ltd.
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s
patent, copyright, trademark, or other intellectual property rights for information contained in
this document. Hitachi bears no responsibility for problems that may arise with third party’s
rights, including intellectual property rights, in connection with use of the information
contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you
have received the latest product standards or specifications before final design, purchase or
use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability.
However, contact Hitachi’s sales office before using the product in an application that
demands especially high quality and reliability or where its failure or malfunction may directly
threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear
power, combustion control, transportation, traffic, safety equipment or medical equipment for
life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi
particularly for maximum rating, operating supply voltage range, heat radiation characteristics,
installation conditions and other characteristics. Hitachi bears no responsibility for failure or
damage when used beyond the guaranteed ranges. Even within the guaranteed ranges,
consider normally foreseeable failure rates or failure modes in semiconductor devices and
employ systemic measures such as fail-safes, so that the equipment incorporating Hitachi
product does not cause bodily injury, fire or other consequential damage due to operation of
the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document
without written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi
semiconductor products.
Preface
The H8/3318 comprises high-performance microcontrollers with a fast H8/300 CPU core and a set
of on-chip supporting functions optimized for embedded control. These include ROM, RAM,
three types of timers, a programmable timing pattern controller, data transfer unit (with 256-byte
DPRAM function), parallel buffer interface, serial communication interface, A/D converter, I/O
ports, and other functions needed in control system configurations, so that compact, highperformance systems can be implemented easily. The H8/3318 includes the H8/3318, with 60kbyte ROM and 4-kbyte RAM.
A ZTAT™ (Zero Turn Around Time) version of the H8/3318 is also available, with userprogrammable PROM, providing a quick and flexible response under all sorts of production
conditions, even for applications with frequently-changing specifications.
This manual describes the hardware of the H8/3318. Refer to the H8/300 Series Programming
Manual for a detailed description of the instruction set.
Contents
Section 1
1.1
1.2
1.3
Overview ............................................................................................................ 1
Overview ............................................................................................................................ 1
Block Diagram.................................................................................................................... 5
Pin Assignments and Functions.......................................................................................... 6
1.3.1 Pin Arrangement ................................................................................................... 6
1.3.2 Pin Assignments in Each Operating Mode ........................................................... 8
1.3.3 Pin Functions......................................................................................................... 12
Section 2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
CPU......................................................................................................................
Overview ............................................................................................................................
2.1.1 Features .................................................................................................................
2.1.2 Address Space .......................................................................................................
2.1.3 Register Configuration ..........................................................................................
Register Descriptions..........................................................................................................
2.2.1 General Registers ..................................................................................................
2.2.2 Control Registers...................................................................................................
2.2.3 Initial Register Values ...........................................................................................
Data Formats ......................................................................................................................
2.3.1 Data Formats in General Registers........................................................................
2.3.2 Memory Data Formats ..........................................................................................
Addressing Modes..............................................................................................................
2.4.1 Addressing Mode ..................................................................................................
2.4.2 Calculation of Effective Address ..........................................................................
Instruction Set ....................................................................................................................
2.5.1 Data Transfer Instructions .....................................................................................
2.5.2 Arithmetic Operations ...........................................................................................
2.5.3 Logic Operations ...................................................................................................
2.5.4 Shift Operations ....................................................................................................
2.5.5 Bit Manipulations..................................................................................................
2.5.6 Branching Instructions ..........................................................................................
2.5.7 System Control Instructions..................................................................................
2.5.8 Block Data Transfer Instruction............................................................................
CPU States..........................................................................................................................
2.6.1 Overview ...............................................................................................................
2.6.2 Program Execution State .......................................................................................
2.6.3 Exception-Handling State......................................................................................
2.6.4 Power-Down State ................................................................................................
Access Timing and Bus Cycle............................................................................................
2.7.1 Access to On-Chip Memory (RAM and ROM)....................................................
19
19
19
20
20
21
21
21
22
23
24
25
26
26
28
32
34
36
37
38
40
45
47
48
50
50
51
51
52
52
52
i
2.7.2
Access to On-Chip Register Field and External Devices...................................... 54
Section 3
57
57
57
57
58
60
61
3.1
3.2
3.3
3.4
MCU Operating Modes and Address Space............................................
Overview ............................................................................................................................
3.1.1 Mode Selection......................................................................................................
3.1.2 Mode and System Control Registers .....................................................................
System Control Register (SYSCR) ....................................................................................
Mode Control Register (MDCR)........................................................................................
Address Space Map in Each Operating Mode....................................................................
Section 4
4.1
4.2
4.3
4.4
Exception Handling ........................................................................................
Overview ............................................................................................................................
Reset ...................................................................................................................................
4.2.1 Overview ...............................................................................................................
4.2.2 Reset Sequence......................................................................................................
4.2.3 Disabling of Interrupts after Reset ........................................................................
Interrupts ............................................................................................................................
4.3.1 Overview ...............................................................................................................
4.3.2 Interrupt-Related Registers ...................................................................................
4.3.3 External Interrupts.................................................................................................
4.3.4 Internal Interrupts..................................................................................................
4.3.5 Interrupt Handling .................................................................................................
4.3.6 Interrupt Response Time .......................................................................................
4.3.7 Precaution..............................................................................................................
Note on Stack Handling......................................................................................................
Section 5
5.1
5.2
ii
63
63
63
63
63
66
66
66
68
71
71
72
77
78
79
Data Transfer Unit .......................................................................................... 81
Overview ............................................................................................................................ 81
5.1.1 Features ................................................................................................................. 81
5.1.2 Block Diagram ...................................................................................................... 85
5.1.3 Input and Output Pins............................................................................................ 86
5.1.4 Register Configuration .......................................................................................... 87
Register Descriptions.......................................................................................................... 89
5.2.1 I/O Control Register (IOCR)................................................................................. 90
5.2.2 Data Transfer Control Registers A, B, and C (DTCRA, DTCRB, DTCRC)........ 92
5.2.3 Data Transfer Address Register H (DTARH) ....................................................... 95
5.2.4 Data Transfer Address Registers A, B, and C (DTARA, DTARB, DTARC) ...... 96
5.2.5 Reload Address Registers A, B, and C (RLARA, RLARB, RLARC).................. 97
5.2.6 Compare Address Register B (CPARB) ............................................................... 97
5.2.7 Serial/Timer Control Register (STCR) ................................................................. 98
5.2.8 DPRAM Data Registers (DPDRWH, DPDRWL, DPDRRH, DPDRRL) ............ 99
5.2.9 DPRAM Data Register Read Query (DPDRRQ).................................................. 102
5.2.10 Parallel Communication Control/Status Register (PCCSR) ................................. 102
5.3
5.4
5.2.11 System Control Register (SYSCR) ....................................................................... 107
Operation ............................................................................................................................ 108
5.3.1 DTU Operation...................................................................................................... 108
5.3.2 DTU and PBI Initialization ................................................................................... 115
5.3.3 I/O Transfer Operations ........................................................................................ 116
5.3.4 Buffer Query in DPRAM Mode............................................................................ 120
5.3.5 Operation in DPRAM Bound Buffer Mode .......................................................... 122
5.3.6 Operation in DPRAM Direct Word Mode ............................................................ 129
5.3.7 Operation in Handshake Mode.............................................................................. 133
Application Notes............................................................................................................... 140
5.4.1 DTU and PBI Processing Time ............................................................................. 140
Section 6
6.1
6.2
6.3
Wait-State Controller ..................................................................................... 143
Overview ............................................................................................................................ 143
6.1.1 Features ................................................................................................................. 143
6.1.2 Block Diagram ...................................................................................................... 143
6.1.3 Input/Output Pins .................................................................................................. 144
6.1.4 Register Configuration .......................................................................................... 144
Register Description ........................................................................................................... 144
6.2.1 Wait-State Control Register (WSCR) ................................................................... 144
Wait Modes ........................................................................................................................ 146
Section 7
7.1
7.2
7.3
7.4
Clock Pulse Generator ................................................................................... 149
Overview ............................................................................................................................ 149
7.1.1 Block Diagram ...................................................................................................... 149
7.1.2 Wait-State Control Register (WSCR) ................................................................... 149
Oscillator Circuit ................................................................................................................ 150
7.2.1 Connecting an External Crystal ............................................................................ 150
7.2.2 Input of External Clock Signal.............................................................................. 152
Duty Adjustment Circuit .................................................................................................... 154
Prescaler ............................................................................................................................. 154
Section 8
8.1
8.2
8.3
I/O Ports ............................................................................................................. 155
Overview ............................................................................................................................ 155
Port 1 .................................................................................................................................. 159
8.2.1 Overview ............................................................................................................... 159
8.2.2 Register Configuration and Descriptions .............................................................. 161
8.2.3 Pin Functions in Each Mode ................................................................................. 162
8.2.4 Input Pull-Up Transistors...................................................................................... 164
Port 2 .................................................................................................................................. 165
8.3.1 Overview ............................................................................................................... 165
8.3.2 Register Configuration and Descriptions .............................................................. 167
8.3.3 Pin Functions in Each Mode ................................................................................. 168
iii
8.3.4 Input Pull-Up Transistors...................................................................................... 170
8.4 Port 3 .................................................................................................................................. 171
8.4.1 Overview ............................................................................................................... 171
8.4.2 Register Configuration and Descriptions .............................................................. 172
8.4.3 Pin Functions in Each Mode ................................................................................. 173
8.4.4 Input Pull-Up Transistors...................................................................................... 175
8.5 Port 4 .................................................................................................................................. 176
8.5.1 Overview ............................................................................................................... 176
8.5.2 Register Configuration and Descriptions .............................................................. 177
8.5.3 Pin Functions in Each Mode ................................................................................. 178
8.6 Port 5 .................................................................................................................................. 183
8.6.1 Overview ............................................................................................................... 183
8.6.2 Register Configuration and Descriptions .............................................................. 183
8.6.3 Pin Functions in Each Mode ................................................................................. 185
8.7 Port 6 .................................................................................................................................. 186
8.7.1 Overview ............................................................................................................... 186
8.7.2 Register Configuration and Descriptions .............................................................. 187
8.7.3 Pin Functions in Each Mode.................................................................................. 188
8.8 Port 7 .................................................................................................................................. 196
8.8.1 Overview ............................................................................................................... 196
8.8.2 Register Configuration and Descriptions .............................................................. 197
8.9 Port 8 .................................................................................................................................. 198
8.9.1 Overview ............................................................................................................... 198
8.9.2 Register Configuration and Descriptions .............................................................. 199
8.9.3 Pin Functions in Each Mode ................................................................................. 200
8.10 Port 9 .................................................................................................................................. 206
8.10.1 Overview ............................................................................................................... 206
8.10.2 Register Configuration and Descriptions .............................................................. 207
8.10.3 Pin Functions in Each Mode ................................................................................. 208
8.11 Application Notes............................................................................................................... 211
8.11.1 Processing when Ports are Not Used .................................................................... 211
Section 9
9.1
9.2
iv
16-Bit Free-Running Timer 0 ...................................................................... 213
Overview ............................................................................................................................ 213
9.1.1 Features ................................................................................................................. 213
9.1.2 Block Diagram ...................................................................................................... 214
9.1.3 Input and Output Pins............................................................................................ 215
9.1.4 Register Configuration .......................................................................................... 216
Register Descriptions.......................................................................................................... 217
9.2.1 Free-Running Counter (FRC)................................................................................ 217
9.2.2 Output Compare Registers A and B (OCRA and OCRB) .................................... 218
9.2.3 Input Capture Registers A to D (ICRA to ICRD) ................................................. 218
9.2.4 Timer Interrupt Enable Register (TIER) ............................................................... 220
9.3
9.4
9.5
9.6
9.7
9.2.5 Timer Control/Status Register (TCSR) ................................................................. 222
9.2.6 Timer Control Register (TCR) .............................................................................. 225
9.2.7 Timer Output Compare Control Register (TOCR) ............................................... 227
CPU Interface ..................................................................................................................... 229
Operation ............................................................................................................................ 232
9.4.1 FRC Incrementation Timing ................................................................................. 232
9.4.2 Output Compare Timing ....................................................................................... 234
9.4.3 FRC Clear Timing................................................................................................. 235
9.4.4 Input Capture Timing............................................................................................ 235
9.4.5 Timing of Input Capture Flag (ICF) Setting ......................................................... 238
9.4.6 Setting of Output Compare Flags A and B (OCFA and OCFB) ........................... 239
9.4.7 Setting of FRC Overflow Flag (OVF) .................................................................. 240
Interrupts ............................................................................................................................ 240
Sample Application ............................................................................................................ 241
Application Notes............................................................................................................... 242
Section 10 16-Bit Free-Running Timer 1 ...................................................................... 247
10.1 Overview ............................................................................................................................ 247
10.1.1 Features ................................................................................................................. 247
10.1.2 Block Diagram ...................................................................................................... 248
10.1.3 Input and Output Pins............................................................................................ 249
10.1.4 Register Configuration .......................................................................................... 249
10.2 Register Descriptions.......................................................................................................... 250
10.2.1 Free-Running Counter (FRC)................................................................................ 250
10.2.2 Output Compare Registers A and B (OCRA and OCRB) .................................... 250
10.2.3 Input Capture Register (ICR) ................................................................................ 251
10.2.4 Timer Control Register (TCR) .............................................................................. 251
10.2.5 Timer Control/Status Register (TCSR) ................................................................. 253
10.3 CPU Interface ..................................................................................................................... 256
10.4 Operation ............................................................................................................................ 259
10.4.1 FRC Incrementation Timing ................................................................................. 259
10.4.2 Output Compare Timing ....................................................................................... 261
10.4.3 FRC Clear Timing................................................................................................. 261
10.4.4 Input Capture Timing............................................................................................ 262
10.4.5 Timing of Input Capture Flag (ICF) Setting ......................................................... 263
10.4.6 Setting of FRC Overflow Flag (OVF) .................................................................. 263
10.5 Interrupts ............................................................................................................................ 264
10.6 Sample Application ............................................................................................................ 264
10.7 Application Notes............................................................................................................... 265
Section 11 8-Bit Timers ...................................................................................................... 271
11.1 Overview ............................................................................................................................ 271
11.1.1 Features ................................................................................................................. 271
v
11.2
11.3
11.4
11.5
11.6
11.1.2 Block Diagram ...................................................................................................... 272
11.1.3 Input and Output Pins............................................................................................ 273
11.1.4 Register Configuration .......................................................................................... 273
Register Descriptions.......................................................................................................... 274
11.2.1 Timer Counter (TCNT) ......................................................................................... 274
11.2.2 Time Constant Registers A and B (TCORA and TCORB) .................................. 274
11.2.3 Timer Control Register (TCR) .............................................................................. 275
11.2.4 Timer Control/Status Register (TCSR) ................................................................. 278
11.2.5 Serial/Timer Control Register (STCR) ................................................................. 280
Operation ............................................................................................................................ 281
11.3.1 TCNT Incrementation Timing .............................................................................. 281
11.3.2 Compare-Match Timing........................................................................................ 283
11.3.3 External Reset of TCNT........................................................................................ 285
11.3.4 Setting of TCSR Overflow Flag (OVF) ................................................................ 285
Interrupts ............................................................................................................................ 286
Sample Application ............................................................................................................ 286
Application Notes............................................................................................................... 287
11.6.1 Contention between TCNT Write and Clear......................................................... 287
11.6.2 Contention between TCNT Write and Increment ................................................. 288
11.6.3 Contention between TCOR Write and Compare-Match ....................................... 289
11.6.4 Contention between Compare-Match A and Compare-Match B.......................... 290
11.6.5 Incrementation Caused by Changing of Internal Clock Source............................ 290
Section 12 Programmable Timing Pattern Controller................................................ 293
12.1 Overview ............................................................................................................................ 293
12.1.1 Features ................................................................................................................. 293
12.1.2 Block Diagram ...................................................................................................... 294
12.1.3 TPC Pins................................................................................................................ 295
12.1.4 Registers................................................................................................................ 296
12.2 Register Descriptions.......................................................................................................... 297
12.2.1 Port 1 Data Direction Register (P1DDR).............................................................. 297
12.2.2 Port 1 Data Register (P1DR) ................................................................................. 297
12.2.3 Port 2 Data Direction Register (P2DDR).............................................................. 297
12.2.4 Port 2 Data Register (P2DR) ................................................................................. 298
12.2.5 Next Data Register A (NDRA) ............................................................................. 298
12.2.6 Next Data Register B (NDRB).............................................................................. 300
12.2.7 Next Data Enable Register 1 (NDER1) ................................................................ 302
12.2.8 Next Data Enable Register 2 (NDER2) ................................................................ 303
12.2.9 TPC Output Control Register (TPCR) .................................................................. 303
12.2.10 TPC Output Mode Register (TPMR) .................................................................... 306
12.3 Operation ............................................................................................................................ 308
12.3.1 Overview ............................................................................................................... 308
12.3.2 Output Timing ....................................................................................................... 309
vi
12.3.3 Normal TPC Output .............................................................................................. 310
12.3.4 Non-Overlapping TPC Output .............................................................................. 312
12.4 Application Notes............................................................................................................... 314
12.4.1 Operation of TPC Output Pins .............................................................................. 314
12.4.2 Note on Non-Overlapping Output......................................................................... 314
Section 13 Watchdog Timer .............................................................................................. 317
13.1 Overview ............................................................................................................................ 317
13.1.1 Features ................................................................................................................. 317
13.1.2 Block Diagram ...................................................................................................... 318
13.1.3 Register Configuration .......................................................................................... 318
13.2 Register Descriptions.......................................................................................................... 319
13.2.1 Timer Counter (TCNT) ......................................................................................... 319
13.2.2 Timer Control/Status Register (TCSR) ................................................................. 319
13.2.3 Register Access ..................................................................................................... 321
13.3 Operation ............................................................................................................................ 322
13.3.1 Watchdog Timer Mode ......................................................................................... 322
13.3.2 Interval Timer Mode ............................................................................................. 323
13.3.3 Setting the Overflow Flag ..................................................................................... 323
13.4 Application Notes............................................................................................................... 324
13.4.1 Contention between TCNT Write and Increment ................................................. 324
13.4.2 Changing the Clock Select Bits (CKS2 to CKS0) ................................................ 324
13.4.3 Recovery from Software Standby Mode ............................................................... 324
Section 14 Serial Communication Interface ................................................................. 325
14.1 Overview ............................................................................................................................ 325
14.1.1 Features ................................................................................................................. 325
14.1.2 Block Diagram ...................................................................................................... 326
14.1.3 Input and Output Pins............................................................................................ 327
14.1.4 Register Configuration .......................................................................................... 328
14.2 Register Descriptions.......................................................................................................... 329
14.2.1 Receive Shift Register (RSR)................................................................................ 329
14.2.2 Receive Data Register (RDR) ............................................................................... 329
14.2.3 Transmit Shift Register (TSR) .............................................................................. 329
14.2.4 Transmit Data Register (TDR).............................................................................. 330
14.2.5 Serial Mode Register (SMR)................................................................................. 330
14.2.6 Serial Control Register (SCR)............................................................................... 332
14.2.7 Serial Status Register (SSR).................................................................................. 335
14.2.8 Bit Rate Register (BRR)........................................................................................ 338
14.2.9 Serial/Timer Control Register (STCR) ................................................................. 348
14.2.10 Serial Communication Mode Register (SCMR) ................................................... 348
14.3 Operation ............................................................................................................................ 350
14.3.1 Overview ............................................................................................................... 350
vii
14.3.2 Asynchronous Mode ............................................................................................. 352
14.3.3 Synchronous Mode................................................................................................ 365
14.4 Interrupts ............................................................................................................................ 371
14.5 Application Notes............................................................................................................... 372
Section 15 A/D Converter .................................................................................................. 375
15.1 Overview ............................................................................................................................ 375
15.1.1 Features ................................................................................................................. 375
15.1.2 Block Diagram ...................................................................................................... 376
15.1.3 Input Pins .............................................................................................................. 377
15.1.4 Register Configuration .......................................................................................... 378
15.2 Register Descriptions.......................................................................................................... 379
15.2.1 A/D Data Registers A to D (ADDRA to ADDRD) .............................................. 379
15.2.2 A/D Control/Status Register (ADCSR) ................................................................ 380
15.2.3 A/D Control Register (ADCR).............................................................................. 382
15.3 CPU Interface ..................................................................................................................... 383
15.4 Operation ............................................................................................................................ 384
15.4.1 Single Mode (SCAN = 0)...................................................................................... 384
15.4.2 Scan Mode (SCAN = 1) ........................................................................................ 386
15.4.3 Input Sampling and A/D Conversion Time .......................................................... 388
15.4.4 External Trigger Input Timing .............................................................................. 389
15.5 Interrupts ............................................................................................................................ 390
15.6 Usage Notes........................................................................................................................ 390
Section 16 RAM .................................................................................................................... 395
16.1 Overview ............................................................................................................................ 395
16.1.1 Block Diagram ...................................................................................................... 395
16.1.2 RAM Enable Bit (RAME) in System Control Register (SYSCR)........................ 396
16.2 Operation ............................................................................................................................ 396
16.2.1 Expanded Modes (Modes 1 and 2)........................................................................ 396
16.2.2 Single-Chip Mode (Mode 3) ................................................................................. 396
16.3 Application Notes............................................................................................................... 397
16.3.1 Note on Initial Values ........................................................................................... 397
Section 17 ROM .................................................................................................................... 399
17.1 Overview ............................................................................................................................ 399
17.1.1 Block Diagram ...................................................................................................... 400
17.2 PROM Mode (H8/3318)..................................................................................................... 401
17.2.1 PROM Mode Setup ............................................................................................... 401
17.2.2 Socket Adapter Pin Assignments and Memory Map ............................................ 401
17.3 Programming...................................................................................................................... 403
17.3.1 Programming and Verification.............................................................................. 404
17.3.2 Notes on Programming.......................................................................................... 408
viii
17.3.3 Reliability of Programmed Data ........................................................................... 408
17.3.4 Erasing Data .......................................................................................................... 409
17.4 Handling of Windowed Packages ...................................................................................... 410
17.4.1 Glass Erasing Window.......................................................................................... 410
17.4.2 Handling after Programming ................................................................................ 410
17.4.3 84-Pin LCC Package ............................................................................................. 410
Section 18 Power-Down State .......................................................................................... 411
18.1 Overview ............................................................................................................................ 411
18.1.1 System Control Register (SYSCR) ....................................................................... 412
18.2 Sleep Mode......................................................................................................................... 413
18.2.1 Transition to Sleep Mode ...................................................................................... 413
18.2.2 Exit from Sleep Mode ........................................................................................... 413
18.3 Software Standby Mode ..................................................................................................... 413
18.3.1 Transition to Software Standby Mode .................................................................. 413
18.3.2 Exit from Software Standby Mode........................................................................ 414
18.3.3 Clock Settling Time for Exit from Software Standby Mode ................................ 414
18.3.4 Sample Application of Software Standby Mode................................................... 415
18.3.5 Application Note ................................................................................................... 415
18.4 Hardware Standby Mode.................................................................................................... 416
18.4.1 Transition to Hardware Standby Mode ................................................................. 416
18.4.2 Recovery from Hardware Standby Mode.............................................................. 416
18.4.3 Timing Relationships ............................................................................................ 417
Section 19 Electrical Specifications ................................................................................ 419
19.1 Absolute Maximum Ratings............................................................................................... 419
19.2 Electrical Characteristics.................................................................................................... 419
19.2.1 DC Characteristics ................................................................................................ 419
19.2.2 AC Characteristics ................................................................................................ 429
19.2.3 A/D Converter Characteristics .............................................................................. 437
19.3 MCU Operational Timing .................................................................................................. 438
19.3.1 Bus Timing............................................................................................................ 438
19.3.2 Control Signal Timing .......................................................................................... 439
19.3.3 16-Bit Free-Running Timer Timing...................................................................... 441
19.3.4 8-Bit Timer Timing ............................................................................................... 442
19.3.5 Serial Communication Interface Timing............................................................... 443
19.3.6 I/O Port Timing ..................................................................................................... 444
19.3.7 Timing Pattern Controller Timing ........................................................................ 444
19.3.8 DPRAM Timing.................................................................................................... 445
19.3.9 External Clock Output Timing.............................................................................. 449
Appendix A CPU Instruction Set .................................................................................... 451
A.1
Instruction Set List ............................................................................................................. 451
ix
A.2
A.3
Operation Code Map .......................................................................................................... 459
Number of States Required for Execution.......................................................................... 461
Appendix B Register Field................................................................................................ 467
B.1
B.2
Register Addresses and Bit Names .................................................................................... 467
Register Descriptions.......................................................................................................... 472
Appendix C I/O Port Block Diagrams ........................................................................... 532
C.1
C.2
C.3
C.4
C.5
C.6
C.7
C.8
C.9
Port 1 Block Diagram.........................................................................................................
Port 2 Block Diagram.........................................................................................................
Port 3 Block Diagram.........................................................................................................
Port 4 Block Diagrams .......................................................................................................
Port 5 Block Diagrams .......................................................................................................
Port 6 Block Diagrams .......................................................................................................
Port 7 Block Diagram.........................................................................................................
Port 8 Block Diagrams .......................................................................................................
Port 9 Block Diagrams .......................................................................................................
532
533
534
535
537
540
546
547
552
Appendix D Pin States........................................................................................................ 559
D.1
Port States in Each Mode ................................................................................................... 559
Appendix E
Timing of Transition to and Recovery from Hardware
Standby Mode ............................................................................................... 561
Appendix F
Product Code Lineup.................................................................................. 562
Appendix G Package Dimensions ................................................................................... 563
x
Revisions and Additions in this Edition
Page
Item
All
H8/3315 deleted
8 to 11
Table 1.2 Pin Assignments in Each Operating Mode
Amended
13
Table 1.3 Pin Functions
Operating mode control
amended
57
3.1.1 Mode Selection
Description added
61
Figure 3.1 H8/3318 Address Space Map
Mode 1 amended
81 to 141
Section 5 Data Transfer Unit
Totally amended
144
6.2.1 Wait-State Control Register (WSCR)
Bit 4 initial value and
Read/Write specification
amended
149
7.1.2 Wait-State Control Register (WSCR)
Bit 4 initial value and
Read/Write specification
amended
203
Figure 8.20 Pin Functions in Mode 3 (Port 8)
Amended
211
8.11 Application Notes
Added
234
Figure 9.6 Timing of Output Compare A
Amended
261
Figure 10.5 Timing of Output Compare A
Amended
311
Figure 12.5 Normal TPC Output Example (Five-Phase
Pulse Output)
Amended
319
13.2.2 Timer Control/Status Register (TCSR)
Notes added and
amended
326
Figure 14.1 Block Diagram of Serial Communication
Interface
Amended
335
14.2.7 Serial Status Register (SSR), Bit 7
Description added
336
14.2.7 Serial Status Register (SSR), Bit 6
Description added
338 to 347 Table 14.3 Examples of BRR Settings in Asynchronous
Mode (When ø P = ø)
Revision
Totally amended
Table 14.6 Examples of BRR Settings in Synchronous
Mode (When ø P = ø/2)
356
Figure 14.5 Sample Flowchart for Transmitting Serial
Data
Description added
361
Figure 14.8 Example of SCI Receive Operation
(8-Bit Data with Parity and One Stop Bit)
Amended
364
Figure 14.11 Example of SCI Receive Operation
(Eight-Bit Data with Multiprocessor Bit and One Stop Bit)
Amended
Page
Item
Revision
369
Figure 14.16 Example of SCI Receive Operation
Amended
370
Figure 14.17 Sample Flowchart for Serial Transmitting
and Receiving
Note added
390 to 394 15.6 Usage Notes
Totally amended
397
16.3 Application Notes
Added
409
Figure 17.6 Recommended Screening Procedure
Amended, note added
431
Table 19.8 Control Signal Timing
Amended
439
Figure 19.5 Basic Bus Cycle (with 1 Wait State) in
Expanded Modes (Modes 1, 2)
Amended
448
Figure 19.23 Receive Timing in Handshake Mode
Amended
477
B.2 Register Descriptions
SSR—Serial Status Register
Description added
495
B.2 Register Descriptions
WSCR—Wait-State Control Register
Amended
526
B.2 Register Descriptions
DTCRB—Data Transfer Control Register B
Amended
528
B.2 Register Descriptions
DTCRC—Data Transfer Control Register C
Amended
558
Figure C.9 (g) Port 9 Block Diagram (Pin P97)
Amended
562
Appendix F Product Code Lineup
Added
563 to 566 Appendix G Package Dimensions
Amended
Section 1 Overview
1.1
Overview
The H8/3318 consists of single-chip microcomputer units (MCUs) featuring an H8/300 CPU core
and a complement of on-chip supporting modules implementing a variety of system functions.
The H8/300 CPU is a high-speed processor with an architecture featuring powerful bitmanipulation instructions, ideally suited for realtime control applications. The on-chip supporting
modules implement peripheral functions needed in system configurations. These include ROM,
RAM, three types of timers (16-bit free-running timers, 8-bit timers, and a watchdog timer), a
programmable timing pattern controller (TPC), a data transfer unit (DTU) with a parallel buffer
interface (PBI) supporting a 256-byte DPRAM function, a serial communication interface (SCI),
an A/D converter, and I/O ports.
The H8/3318 can operate in single-chip mode or in two expanded modes, depending on the
requirements of the application. The H8/3318 is available in a masked ROM version, or a ZTAT*
version with electrically programmable ROM that can be programmed at the user site.
Note: * ZTAT is a trademark of Hitachi, Ltd.
Table 1.1 lists the features of the H8/3318
1
Table 1.1
Features
Item
Description
CPU
Two-way general register configuration
•
Eight 16-bit registers, or
•
Sixteen 8-bit registers
High-speed operation
•
Maximum clock rate: 16 MHz/5 V, 12 MHz/4 V, and 10 MHz/3 V (ø clock)
•
Add/subtract: 125 ns (16 MHz operation), 167 ns (12 MHz operation), and
200 ns (10 MHz operation)
•
Multiply/divide: 875 ns (16 MHz operation), 1167 ns (12 MHz operation),
and 1400 ns (10 MHz operation)
Streamlined, concise instruction set
•
Instruction length: 2 or 4 bytes
•
Register-register arithmetic and logic operations
•
MOV instruction for data transfer between registers and memory
Instruction set features
Memory
Data transfer
unit (DTU)
(4 channels)
16-bit freerunning timer
(2 channels)
2
•
Multiply instruction (8 bits × 8 bits)
•
Divide instruction (16 bits ÷ 8 bits)
•
Bit-accumulator instructions
•
Register-indirect specification of bit positions
•
60-kbyte ROM
•
4-kbyte RAM
•
1 channel for PBI transfer (single address)
•
1 channel for I/O transfer (dual address)
•
2 channels for either PBI or I/O transfer
•
One 16-bit free-running counter per channel (can also count external
events)
•
Two output-compare lines per channel
•
Channel 0: four input capture lines (can be buffered)
•
Channel 1: one input capture line
Table 1.1
Features (cont)
Item
Description
8-bit timer
(2 channels)
Each channel has
•
One 8-bit up-counter (can also count external events)
•
Two time constant registers
•
Maximum 16-bit pulse output, using FRT as time base
•
Up to four 4-bit pulse output groups (or one 16-bit group, or two 8-bit
groups)
•
Non-overlap mode available
•
Output data can be transferred by DTU
Watchdog timer
(WDT)
(1 channel)
•
Overflow or NMI interrupt can reset the chip
•
Also usable as interval timer
Serial
communication
interface (SCI)
(2 channels)
•
Asynchronous or synchronous mode (selectable)
•
Full duplex: can transmit and receive simultaneously
•
On-chip baud rate generator
A/D converter
•
10-bit resolution
•
Eight channels: single or scan mode (selectable)
•
Start of A/D conversion can be externally triggered
•
Sample-and-hold function
•
58 input/output lines (16 of which can drive LEDs)
•
Eight input-only lines
•
Nine external interrupt lines: NMI, IRQ0 to IRQ7
•
33 on-chip interrupt sources
•
Expanded mode with on-chip ROM disabled (mode 1)
•
Expanded mode with on-chip ROM enabled (mode 2)
•
Single-chip mode (mode 3)
•
Sleep mode
•
Software standby mode
•
Hardware standby mode
•
On-chip oscillator
Programmable
timing pattern
controller (TPC)
I/O ports
Interrupts
Operating
modes
Power-down
modes
Other features
3
Table 1.1
Item
Features (cont)
Description
Series lineup
Model
Product Name
5 V Version
(16 MHz)
4 V Version
(12 MHz)
3 V Version
(10 MHz)
H8/3318 ZTAT
HD6473318CG16
H8/3318
4
Package
ROM
HD6473318CG16
84-pin windowed
LCC (CG-84)
PROM
HD6473318CP16
HD6473318CP16
84-pin PLCC
(CP-84)
HD6473318F16
HD6473318F16
80-pin QFP
(FP-80A)
HD6473318TF16
HD6473318TF16
80-pin TQFP
(TFP-80C)
HD6433318CP16
HD6433318CP12
HD6433318VCP10 84-pin PLCC
(CP-84)
HD6433318F16
HD6433318F12
HD6433318VF10
80-pin QFP
(FP-80A)
HD6433318TF16
HD6433318TF12
HD6433318VTF10
80-pin TQFP
(TFP-80C)
Mask
ROM
1.2
Block Diagram
Address bus
Data bus (high)
Port 9
Serial
communication
interface
(2 channels)
8-bit timer
(2 channels)
10-bit
A/D converter
(8 channels)
P40/TMCI0/XDDB0
P41/TMO0/XDDB1
P42/TMRI0/XDDB2
P43/TMCI1/XDDB3
P44/TMO1/XDDB4
P45/TMRI1/XDDB5
P46/FTOA1/XDDB6
P47/FTOB1/XDDB7
P30/D0/DDB0
P31/D1/DDB1
P32/D2/DDB2
P33/D3/DDB3
P34/D4/DDB4
P35/D5/DDB5
P36/D6/DDB6
P37/D7/DDB7
P80/RS0
P81/RS1
P82/RS2
P83/WRQ/XRDY
P84/TxD1/IRQ3/XWE
P85/RxD1/IRQ4
P86/SCK1/IRQ5/XOE
Data transfer
unit, DPRAM
function
16-bit
free-running
timer
(2 channels)
Port 4
Port 3
Timing pattern
controller
P90/ADTRG/IRQ2
P91/IRQ1/XCS
P92/IRQ0
P93/RD/CS
P94/WR/OE
P95/AS/RDY
P94/ø
P97/WAIT/WE
Port 8
Port 1
Watchdog
timer
Port 7
P77/AN7
P76/AN6
P75/AN5
P74/AN4
P73/AN3
P72/AN2
P71/AN1
P70/AN0
AVCC
AVSS
P60/FTCI/ETMCI0
P61/FTOA0
P62/FTIA/FTI
P63/FTIB/ETMRI0
P64/FTIC/ETMO0
P65/FTID/ETMCI1
P66/FTOB0/IRQ6/ETMRI1
P67/IRQ7/ETMO1
RAM
ROM
Port 2
P20/A8/TP8
P21/A9/TP9
P22/A10/TP10
P23/A11/TP11
P24/A12/TP12
P25/A13/TP13
P26/A14/TP14
P27/A15/TP15
Data bus (low)
Port 6
P10/A0/TP0
P11/A1/TP1
P12/A2/TP2
P13/A3/TP3
P14/A4/TP4
P15/A5/TP5
P16/A6/TP6
P17/A7/TP7
CPU
H8/300
Port 5
P50/TxD0
P51/RxD0
P52/SCK0
Clock pulse
generator
XTAL
EXTAL
RES
STBY
NMI
MD0
MD1
VCC
VCC
VSS
VSS
VSS
VSS
VSS
VSS *
VSS
Figure 1.1 shows a block diagram of the H8/3318.
Note: * CP-84 and CG-84 only.
Figure 1.1 Block Diagram
5
1.3
Pin Assignments and Functions
1.3.1
Pin Arrangement
P86/SCK1/IRQ5/XOE
P85/RxD1/IRQ4
P84/TxD1/IRQ3/XWE
P83/WRQ/XRDY
P82/RS2
P81/RS1
P80/RS0
VSS
P37/D7/DDB7
VSS
P36/D6/DDB6
P35/D5/DDB5
P34/D4/DDB4
P33/D3/DDB3
P32/D2/DDB2
P31/D1/DDB1
P30/D0/DDB0
P10/A0/TP0
P11/A1/TP1
P12/A2/TP2
P13/A3/TP3
Figure 1.2 shows the pin arrangement of the CP-84 and CG-84 packages. Figure 1.3 shows the pin
arrangement of the FP-80A and TFP-80C packages.
11 10 9 8 7 6 5 4 3 2 1 84 83 82 81 80 79 78 77 76 75
RES
XTAL
EXTAL
MD1
MD0
NMI
STBY
VCC
P52/SCK0
P51/RxD0
P50/TxD0
VSS
VSS
P97/WAIT/WE
P96/ø
P95/AS/RDY
P94/WR/OE
P93/RD/CS
P92/IRQ0
P91/IRQ1/XCS
P90/ADTRG/IRQ2
12
74
13
73
14
72
15
71
16
70
17
69
18
68
19
67
20
66
21
65
22
64
23
63
24
62
25
61
26
60
27
59
28
58
29
57
30
56
31
55
54
32
P14/A4/TP4
P15/A5/TP5
P16/A6/TP6
P17/A7/TP7
VSS
P20/A8/TP8
P21/A9/TP9
P22/A10/TP10
P23/A11/TP11
P24/A12/TP12
VSS
P25/A13/TP13
P26/A14/TP14
P27/A15/TP15
VCC
P47/FTOB1/XDDB7
P46/FTOA1/XDDB6
P45/TMRI1/XDDB5
P44/TMO1/XDDB4
P43/TMCI1/XDDB3
P42/TMRI0/XDDB2
P60/FTCI/ETMCI0
P61/FTOA0
P62/FTIA/FTI
P63/FTIB/ETMRI0
P64/FTIC/ETMO0
P65/FTID/ETMCI1
P66/FTOB0/IRQ6/ETMRI1
P67/IRQ7/ETMO1
VSS
AVCC
P70/AN0
P71/AN1
P72/AN2
P73/AN3
P74/AN4
P75/AN5
P76/AN6
P77/AN7
AVSS
P40/TMCI0/XDDB0
P41/TMO0/XDDB1
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
Figure 1.2 Pin Arrangement (CP-84 and CG-84, Top View)
6
P86/SCK1/IRQ5/XOE
P85/RxD1/IRQ4
P84/TxD1/IRQ3/XWE
P83/WRQ/XRDY
P82/RS2
P81/RS1
P80/RS0
VSS
P37/D7/DDB7
P36/D6/DDB6
P35/D5/DDB5
P34/D4/DDB4
P33/D3/DDB3
P32/D2/DDB2
P31/D1/DDB1
P30/D0/DDB0
P10/A0/TP0
P11/A1/TP1
P12/A2/TP2
P13/A3/TP3
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61
RES
XTAL
EXTAL
MD1
MD0
NMI
STBY
VCC
P52/SCK0
P51/RxD0
P50/TxD0
VSS
P97/WAIT/WE
P96/ø
P95/AS/RDY
P94/WR/OE
P93/RD/CS
P92/IRQ0
P91/IRQ1/XCS
P90/ADTRG/IRQ2
1
60
2
59
3
58
4
57
5
56
6
55
7
54
8
53
9
52
10
51
11
50
12
49
13
48
14
47
15
46
16
45
17
44
18
43
19
42
41
20
P14/A4/TP4
P15/A5/TP5
P16/A6/TP6
P17/A7/TP7
VSS
P20/A8/TP8
P21/A9/TP9
P22/A10/TP10
P23/A11/TP11
P24/A12/TP12
P25/A13/TP13
P26/A14/TP14
P27/A15/TP15
VCC
P47/FTOB1/XDDB7
P46/FTOA1/XDDB6
P45/TMRI1/XDDB5
P44/TMO1/XDDB4
P43/TMCI1/XDDB3
P42/TMRI0/XDDB2
P60/FTCI/ETMCI0
P61/FTOA0
P62/FTIA/FTI
P63/FTIB/ETMRI0
P64/FTIC/ETMO0
P65/FTID/ETMCI1
P66/FTOB0/IRQ6/ETMRI1
P67/IRQ7/ETMO1
AVCC
P70/AN0
P71/AN1
P72/AN2
P73/AN3
P74/AN4
P75/AN5
P76/AN6
P77/AN7
AVSS
P40/TMCI0/XDDB0
P41/TMO0/XDDB1
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Figure 1.3 Pin Arrangement (FP-80A and TFP-80C, Top View)
7
1.3.2
Pin Assignments in Each Operating Mode
Table 1.2 lists the assignments of the pins of the CP-84, CG-84, FP-80A, and TFP-80C packages
in each operating mode.
Table 1.2
Pin Assignments in Each Operating Mode
Expanded Modes
Pin No.
Mode 1
Single-Chip Mode
Mode 2
Mode 3
CP-84
CG-84
PBI
FP-80A
Enabled
TFP-80C (DPME = 1)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Enabled
(DPME = 1)
PROM
Mode
1
71
D6
D6
D6
P36
DDB6
EO6
2
—
VSS
VSS
VSS
VSS
VSS
VSS
3
72
D7
D7
D7
P37
DDB7
EO7
4
73
VSS
VSS
VSS
VSS
VSS
VSS
5
74
RS 0
P80
P80
P80
RS 0
NC
6
75
RS 1
P81
P81
P81
RS 1
NC
7
76
RS 2
P82
P82
P82
RS 2
NC
8
77
WRQ/XRDY P83
P83
P83
WRQ
NC
9
78
XWE
P84/TxD1/
IRQ3
P84/TxD1/
IRQ3
P84/TxD1/
IRQ3
P84/TxD1/
IRQ3
NC
10
79
P85/RxD1/
IRQ4
P85/RxD1/
IRQ4
P85/RxD1/
IRQ4
P85/RxD1/
IRQ4
P85/RxD1/
IRQ4
NC
11
80
XOE
P86/SCK1/
IRQ5
P86/SCK1/
IRQ5
P86/SCK1/
IRQ5
P86/SCK1/
IRQ5
NC
12
1
RES
RES
RES
RES
RES
VPP
13
2
XTAL
XTAL
XTAL
XTAL
XTAL
NC
14
3
EXTAL
EXTAL
EXTAL
EXTAL
EXTAL
NC
15
4
MD1
MD1
MD1
MD1
MD1
VSS
16
5
MD0
MD0
MD0
MD0
MD0
VSS
17
6
NMI
NMI
NMI
NMI
NMI
EA9
18
7
STBY
STBY
STBY
STBY
STBY
VSS
19
8
VCC
VCC
VCC
VCC
VCC
VCC
20
9
P52/SCK0
P52/SCK0
P52/SCK0
P52/SCK0
P52/SCK0
NC
Note: Pins marked NC should be left unconnected.
For details on PROM mode, refer to 17.2, PROM Mode.
8
Table 1.2
Pin Assignments in Each Operating Mode (cont)
Expanded Modes
Pin No.
Mode 1
Single-Chip Mode
Mode 2
Mode 3
CP-84
CG-84
PBI
FP-80A
Enabled
TFP-80C (DPME = 1)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Enabled
(DPME = 1)
PROM
Mode
21
10
P51/RxD0
P51/RxD0
P51/RxD0
P51/RxD0
P51/RxD0
NC
22
11
P50/TxD0
P50/TxD0
P50/TxD0
P50/TxD0
P50/TxD0
NC
23
12
VSS
VSS
VSS
VSS
VSS
VSS
24
—
VSS
VSS
VSS
VSS
VSS
VSS
25
13
WAIT
WAIT
WAIT
P97
WE
NC
26
14
ø
ø
ø
P96/ø
P96/ø
NC
27
15
AS
AS
AS
P95
RDY
NC
28
16
WR
WR
WR
P94
OE
NC
29
17
RD
RD
RD
P93
CS
NC
30
18
P92/IRQ0
P92/IRQ0
P92/IRQ0
P92/IRQ0
P92/IRQ0
PGM
31
19
XCS
P91/IRQ1
P91/IRQ1
P91/IRQ1
P91/IRQ1
EA15
32
20
P90/IRQ2/
ADTRG
P90/IRQ2/
ADTRG
P90/IRQ2/
ADTRG
P90/IRQ2/
ADTRG
P90/IRQ2/
ADTRG
EA16
33
21
P60/ETMCI0/ P60/FTCI
FTCI
P60/FTCI
P60/FTCI
P60/FTCI
NC
34
22
P61/FTOA0
P61/FTOA0
P61/FTOA0
P61/FTOA0
P61/FTOA0
NC
35
23
P62/FTIA/
FTI
P62/FTIA/
FTI
P62/FTIA/
FTI
P62/FTIA/
FTI
P62/FTIA/
FTI
NC
36
24
P63/ETMRI0/ P63/FTIB
FTIB
P63/FTIB
P63/FTIB
P63/FTIB
VCC
37
25
P64/ETMO0/
FTIC
P64/FTIC
P64/FTIC
P64/FTIC
P64/FTIC
VCC
38
26
P65/ETMCI1/ P65/FTID
FTID
P65/FTID
P65/FTID
P65/FTID
NC
39
27
P66/ETMRI1/ P66/FTOB0/
FTOB0/IRQ6 IRQ6
P66/FTOB0/
IRQ6
P66/FTOB0/
IRQ6
P66/FTOB0/
IRQ6
NC
40
28
P67/ETMO1/
IRQ7
P67/IRQ7
P67/IRQ7
P67/IRQ7
NC
P67/IRQ7
Note: Pins marked NC should be left unconnected.
For details on PROM mode, refer to 17.2, PROM Mode.
9
Table 1.2
Pin Assignments in Each Operating Mode (cont)
Expanded Modes
Pin No.
Mode 1
Single-Chip Mode
Mode 2
Mode 3
CP-84
CG-84
PBI
FP-80A
Enabled
TFP-80C (DPME = 1)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Enabled
(DPME = 1)
PROM
Mode
41
—
VSS
VSS
VSS
VSS
VSS
VSS
42
29
AVCC
AVCC
AVCC
AVCC
AVCC
VCC
43
30
P70/AN0
P70/AN0
P70/AN0
P70/AN0
P70/AN0
NC
44
31
P71/AN1
P71/AN1
P71/AN1
P71/AN1
P71/AN1
NC
45
32
P72/AN2
P72/AN2
P72/AN2
P72/AN2
P72/AN2
NC
46
33
P73/AN3
P73/AN3
P73/AN3
P73/AN3
P73/AN3
NC
47
34
P74/AN4
P74/AN4
P74/AN4
P74/AN4
P74/AN4
NC
48
35
P75/AN5
P75/AN5
P75/AN5
P75/AN5
P75/AN5
NC
49
36
P76/AN6
P76/AN6
P76/AN6
P76/AN6
P76/AN6
NC
50
37
P77/AN7
P77/AN7
P77/AN7
P77/AN7
P77/AN7
NC
51
38
AVSS
AVSS
AVSS
AVSS
AVSS
VSS
52
39
XDDB0
P40/TMCI0
P40/TMCI0
P40/TMCI0
P40/TMCI0
NC
53
40
XDDB1
P41/TMO0
P41/TMO0
P41/TMO0
P41/TMO0
NC
54
41
XDDB2
P42/TMRI0
P42/TMRI0
P42/TMRI0
P42/TMRI0
NC
55
42
XDDB3
P43/TMCI1
P43/TMCI1
P43/TMCI1
P43/TMCI1
NC
56
43
XDDB4
P44/TMO1
P44/TMO1
P44/TMO1
P44/TMO1
NC
57
44
XDDB5
P45/TMRI1
P45/TMRI1
P45/TMRI1
P45/TMRI1
NC
58
45
XDDB6
P46/FTOA1
P46/FTOA1
P46/FTOA1
P46/FTOA1
NC
59
46
XDDB7
P47/FTOB1
P47/FTOB1
P47/FTOB1
P47/FTOB1
NC
60
47
VCC
VCC
VCC
VCC
VCC
VCC
61
48
A15
A15
P27/A 15 /TP15
P27/TP15
P27/TP15
CE
62
49
A14
A14
P26/A 14 /TP14
P26/TP14
P26/TP14
EA14
63
50
A13
A13
P25/A 13 /TP13
P25/TP13
P25/TP13
EA13
64
—
VSS
VSS
VSS
VSS
VSS
VSS
65
51
A12
A12
P24/A 12 /TP12
P24/TP12
P24/TP12
EA12
66
52
A11
A11
P23/A 11 /TP11
P23/TP11
P23/TP11
EA11
Note: Pins marked NC should be left unconnected.
For details on PROM mode, refer to 17.2, PROM Mode.
10
Table 1.2
Pin Assignments in Each Operating Mode (cont)
Expanded Modes
Pin No.
Mode 1
Single-Chip Mode
Mode 2
Mode 3
CP-84
CG-84
PBI
FP-80A
Enabled
TFP-80C (DPME = 1)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Disabled
(DPME = 0)
PBI
Enabled
(DPME = 1)
PROM
Mode
67
53
A10
A10
P22/A 10 /TP10
P22/TP10
P22/TP10
EA10
68
54
A9
A9
P21/A 9/TP9
P21/TP9
P21/TP9
OE
69
55
A8
A8
P20/A 8/TP8
P20/TP8
P20/TP8
EA8
70
56
VSS
VSS
VSS
VSS
VSS
VSS
71
57
A7
A7
P17/A 7/TP7
P17/TP7
P17/TP7
EA7
72
58
A6
A6
P16/A 6/TP6
P16/TP6
P16/TP6
EA6
73
59
A5
A5
P15/A 5/TP5
P15/TP5
P15/TP5
EA5
74
60
A4
A4
P14/A 4/TP4
P14/TP4
P14/TP4
EA4
75
61
A3
A3
P13/A 3/TP3
P13/TP3
P13/TP3
EA3
76
62
A2
A2
P12/A 2/TP2
P12/TP2
P12/TP2
EA2
77
63
A1
A1
P11/A 1/TP1
P11/TP1
P11/TP1
EA1
78
64
A0
A0
P10/A 0/TP0
P10/TP0
P10/TP0
EA0
79
65
D0
D0
D0
P30
DDB0
EO0
80
66
D1
D1
D1
P31
DDB1
EO1
81
67
D2
D2
D2
P32
DDB2
EO2
82
68
D3
D3
D3
P33
DDB3
EO3
83
69
D4
D4
D4
P34
DDB4
EO4
84
70
D5
D5
D5
P35
DDB5
EO5
Note: Pins marked NC should be left unconnected.
For details on PROM mode, refer to 17.2, PROM Mode.
11
1.3.3
Pin Functions
Table 1.3 gives a description of the function of each pin.
Table 1.3
Pin Functions
Pin No.
Type
Symbol
CP-84
CG-84
FP-80A
TFP-80C
I/O
Name and Function
Power
VCC
19, 60
8, 47
I
Power: Connected to the power supply.
Connect both VCC pins to the system
power supply.
VSS
2, 4, 23,
24, 41,
64, 70
12, 56,
73
I
Ground: Connected to ground (0 V).
Connect all V SS pins to system ground
(0 V).
XTAL
13
2
I
Crystal: Connected to a crystal
oscillator. The crystal frequency should
be the same as the desired system
clock frequency. When an external
clock is input from the EXTAL pin, an
inverse-phase clock should be input to
the XTAL pin.
EXTAL
14
3
I
External crystal: Connected to a
crystal oscillator or external clock. The
frequency of the external clock should
be the same as the desired system
clock frequency. See section 7.2,
Oscillator Circuit, for examples of
connections to a crystal and external
clock.
ø
26
14
O
System clock: Supplies the system
clock to peripheral devices.
RES
12
1
I
Reset: A low input causes the chip to
reset.
STBY
18
7
I
Standby: A transition to hardware
standby mode (a power-down state)
occurs when a low input is received at
the STBY pin.
Address
bus
A15 to A 0
61 to 63,
65 to 69,
71 to 78
48 to 55,
57 to 64
O
Address bus: Address output pins.
Data bus
D7 to D0
3, 1,
84 to 79
72 to 65
I/O
Data bus: 8-bit bidirectional data bus.
Clock
System
control
12
Table 1.3
Pin Functions (cont)
Pin No.
Type
Symbol
CP-84
CG-84
FP-80A
TFP-80C
I/O
Name and Function
Bus control
WAIT
25
13
I
Wait: Requests the CPU to insert wait
states into the bus cycle when an
external address is accessed.
RD
29
17
O
Read: Goes low to indicate that the
CPU is reading an external address.
WR
28
16
O
Write: Goes low to indicate that the
CPU is writing to an external address.
AS
27
15
O
Address strobe: Goes low to indicate
that there is a valid address on the
address bus.
NMI
17
6
I
Non-maskable interrupt: Highestpriority interrupt request. The NMIEG bit
in the system control register
determines whether the interrupt is
recognized at the rising or falling edge
of the NMI input.
IRQ0 to
IRQ7
30 to 32,
9 to 11,
39, 40
18 to 20,
78 to 80,
27, 28
I
Interrupt request 0 to 7: Maskable
interrupt request pins.
MD1,
MD0
15
16
4
5
I
Mode: Input pins for setting the MCU
operating mode according to the table
below.
These pins must not be changed during
MCU operation.
Interrupt
signals
Operating
mode
control
MD1
MD0
Mode
Description
0
0
Mode 0
Setting
prohibited
0
1
Mode 1
Expanded mode
with on-chip
ROM disabled
1
0
Mode 2
Expanded mode
with on-chip
ROM enabled
1
1
Mode 3
Single-chip
mode
13
Table 1.3
Pin Functions (cont)
Pin No.
Type
Symbol
CP-84
CG-84
FP-80A
TFP-80C
I/O
Name and Function
16-bit freerunning
timer (FRT)
FTCI
33
21
I
FRT counter clock input: Input pin for
an external clock signal for the freerunning counter (FRC) in FRT0 and
FRT1.
FTOA0,
FTOA1
34
58
22
45
O
FRT output compare A: Output pin for
output compare A in FRT0 and FRT1.
FTOB0,
FTOB1
39
59
27
46
O
FRT output compare B: Output pin for
output compare B in FRT0 and FRT1.
FTIA,
FTI
35
35
23
23
I
FRT input capture A: Input pin for
input capture A in FRT0, input pin for
input capture in FRT1.
FTIB
36
24
I
FRT input capture B: Input pin for
input capture B in FRT0.
FTIC
37
25
I
FRT input capture C: Input pin for
input capture C in FRT0.
FTID
38
26
I
FRT input capture D: Input pin for
input capture D in FRT0.
TMO0,
TMO1
53
56
40
43
O
8-bit timer output (channels 0 and 1):
Compare-match output pins for the 8-bit
timers.
TMCI0,
TMCI1
52
55
39
42
I
8-bit timer counter clock input
(channels 0 and 1): External clock
input pins for the 8-bit timer counters.
TMRI0,
TMRI1
54
57
41
44
I
8-bit timer counter reset input
(channels 0 and 1): Inputs at these
pins reset the 8-bit timer counters.
ETMO0,
ETMO1
37
40
25
28
O
8-bit timer output (channels 0 and 1):
Compare-match output pins for the 8-bit
timers.
ETMCI0,
ETMCI1
33
38
21
26
I
8-bit timer counter clock input
(channels 0 and 1): External clock
input pins for the 8-bit timers.
ETMRI0,
ETMRI1
36
39
24
27
I
8-bit timer counter reset input
(channels 0 and 1): Inputs at these
pins reset the 8-bit timer counters.
8-bit timer
8-bit timer
(pins used
in expanded
modes when
PBI is
enabled)
14
Table 1.3
Pin Functions (cont)
Pin No.
CP-84
CG-84
FP-80A
TFP-80C
I/O
Name and Function
TP 15 to
Programmable timing TP 0
pattern
controller
(TPC)
61 to 63,
65 to 69,
71 to 78
48 to 55,
57 to 64
O
TPC output 15 to 0: Pulse output pins.
Serial communication
interface
(SCI)
TxD0,
TxD1
22
9
11
78
O
Transmit data (channels 0 and 1):
Data output pins for the serial
communication interface.
RxD0,
RxD1
21
10
10
79
I
Receive data (channels 0 and 1):
Data input pins for the serial
communication interface.
SCK 0,
SCK 1
20
11
9
80
I/O
Serial clock (channels 0 and 1):
Input/output pins for the serial clock.
AN 7 to
AN 0
50 to 43
37 to 30
I
Analog input: Analog signal input pins
for the A/D converter.
ADTRG
32
20
I
A/D trigger: External trigger input for
starting the A/D converter.
AVCC
42
29
I
Analog reference voltage: Reference
voltage pin for the A/D converter. If the
A/D converter is not used, connect AVCC
to the system power supply. Refer to
section 19, Electrical Specifications.
AVSS
51
38
I
Analog ground: Ground pin for the A/D
converter. Connect to system ground
(0 V).
DDB7 to
DDB0
3, 1,
84 to 79
72 to 65
I/O
DPRAM data bus: 8-bit bidirectional
data bus for DPRAM access by an
external CPU.
CS
29
17
I
Chip select: Chip select input pin for
selecting DPRAM.
RS 2 to
RS 0
7 to 5
76 to 74
I
Register select: Address input pins for
accessing DPRAM.
OE
28
16
I
Output enable: Output enable input pin
for reading DPRAM.
WE
25
13
I
Write enable: Write enable input pin for
writing to DPRAM.
Type
A/D
converter
Dual-port
RAM
(DPRAM)
Symbol
15
Table 1.3
Pin Functions (cont)
Pin No.
Type
Symbol
CP-84
CG-84
FP-80A
TFP-80C
I/O
Name and Function
Dual-port
RAM
(DPRAM)
RDY
27
15
O
Ready: Ready output pin for sending
interrupt requests to an external CPU.
NMOS open-drain output.
WRQ
8
77
O
Wait request: Output pin for sending
wait requests to an external CPU.
XDDB7 to
XDDB0
59 to 52
46 to 39
I/O
DPRAM data bus: 8-bit bidirectional
data bus for DPRAM access by an
external CPU.
XCS
31
19
I
Chip select: Chip select input pin for
selecting DPRAM.
RS 2 to
RS 0
7 to 5
76 to 74
I
Register select: Address input pin for
accessing DPRAM.
XOE
11
80
I
Output enable: Output enable input pin
for reading DPRAM.
XWE
9
78
I
Write enable: Write enable input pin for
writing to DPRAM.
WRQ/
XRDY
8
77
O
Ready/wait request: Output pin for
sending interrupt requests to an
external CPU.
P17 to P1 0
71 to 78
57 to 64
I/O
Port 1: An 8-bit input/output port with
programmable MOS input pull-ups and
LED driving capability. The direction of
each bit can be selected in the port 1
data direction register (P1DDR).
P27 to P2 0
61 to 63,
65 to 69
48 to 55
I/O
Port 2: An 8-bit input/output port with
programmable MOS input pull-ups and
LED driving capability. The direction of
each bit can be selected in the port 2
data direction register (P2DDR).
P37 to P3 0
3, 1,
84 to 79
72 to 65
I/O
Port 3: An 8-bit input/output port with
programmable MOS input pull-ups. The
direction of each bit can be selected in
the port 3 data direction register
(P3DDR).
Dual-port
RAM
(DPRAM)
(pin functions
in expanded
modes when
PBI is
enabled)
I/O ports
16
Table 1.3
Pin Functions (cont)
Pin No.
Type
Symbol
CP-84
CG-84
FP-80A
TFP-80C
I/O
Name and Function
I/O ports
P47 to P4 0
59 to 52
46 to 39
I/O
Port 4: An 8-bit input/output port. The
direction of each bit can be selected in
the port 4 data direction register
(P4DDR).
P52 to P5 0
20 to 22
9 to 11
I/O
Port 5: A 3-bit input/output port. The
direction of each bit can be selected in
the port 5 data direction register
(P5DDR).
P67 to P6 0
40 to 33
28 to 21
I/O
Port 6: An 8-bit input/output port. The
direction of each bit can be selected in
the port 6 data direction register
(P6DDR).
P77 to P7 0
50 to 43
37 to 30
I
Port 7: An 8-bit input port.
P86 to P8 0
11 to 5
80 to 74
I/O
Port 8: A 7-bit input/output port. The
direction of each bit can be selected in
the port 8 data direction register
(P8DDR).
P97 to P9 0
25 to 32
13 to 20
I/O
Port 9: An 8-bit input/output port. The
direction of each bit (except for P9 6) can
be selected in the port 9 data direction
register (P9DDR).
17
Section 2 CPU
2.1
Overview
The H8/300 CPU is a fast central processing unit with eight 16-bit general registers (also
configurable as 16 eight-bit registers) and a concise instruction set designed for high-speed
operation.
2.1.1
Features
The main features of the H8/300 CPU are listed below.
• Two-way register configuration
 Sixteen 8-bit general registers, or
 Eight 16-bit general registers
• Instruction set with 57 basic instructions, including:
 Multiply and divide instructions
 Powerful bit-manipulation instructions
• Eight addressing modes
 Register direct (Rn)
 Register indirect (@Rn)
 Register indirect with displacement (@(d:16, Rn))
 Register indirect with post-increment or pre-decrement (@Rn+ or @–Rn)
 Absolute address (@aa:8 or @aa:16)
 Immediate (#xx:8 or #xx:16)
 PC-relative (@(d:8, PC))
 Memory indirect (@@aa:8)
• Maximum 64-kbyte address space
• High-speed operation
 All frequently-used instructions are executed in two to four states
 The maximum clock rate is 16 MHz/5 V, 12 MHz/4 V, or 10 MHz/3 V (ø clock)
 8- or 16-bit register-register add or subtract: 125 ns (16 MHz operation),
167 ns (12 MHz operation), 200 ns (10 MHz operation)
 8 × 8-bit multiply: 875 ns (16 MHz operation), 1167 ns (12 MHz operation),
1400 ns (10 MHz operation)
 16 ÷ 8-bit divide: 875 ns (16 MHz operation), 1167 ns (12 MHz operation),
1400 ns (10 MHz operation)
• Power-down mode
 SLEEP instruction
19
2.1.2
Address Space
The H8/300 CPU supports an address space with a maximum size of 64 kbytes for program code
and data combined. The memory map differs depending on the mode (mode 1, 2, or 3). For details,
see section 3.4, Address Space Map in Each Operating Mode.
2.1.3
Register Configuration
Figure 2.1 shows the internal register structure of the H8/300 CPU. There are two groups of
registers: the general registers and control registers.
General registers (Rn)
7
0 7
0
R0H
R0L
R1H
R1L
R2H
R2L
R3H
R3L
R4H
R4L
R5H
R5L
R6H
R6L
R7H
(SP)
SP: Stack pointer
R7L
Control registers
15
0
PC
7 6 5 4 3 2 1 0
CCR I U H U N Z V C
PC: Program counter
CCR: Condition code register
Carry flag
Overflow flag
Zero flag
Negative flag
Half-carry flag
Interrupt mask bit
User bit
User bit
Figure 2.1 CPU Registers
20
2.2
Register Descriptions
2.2.1
General Registers
All the general registers can be used as both data registers and address registers. When used as
address registers, the general registers are accessed as 16-bit registers (R0 to R7). When used as
data registers, they can be accessed as 16-bit registers, or the high and low bytes can be accessed
separately as 8-bit registers (R0H to R7H and R0L to R7L).
R7 also functions as the stack pointer, used implicitly by hardware in processing interrupts and
subroutine calls. In assembly-language coding, R7 can also be denoted by the letters SP. As
indicated in figure 2.2, R7 (SP) points to the top of the stack.
Unused area
SP (R7)
Stack area
Figure 2.2 Stack Pointer
2.2.2
Control Registers
The CPU control registers include a 16-bit program counter (PC) and an 8-bit condition code
register (CCR).
(1) Program Counter (PC): This 16-bit register indicates the address of the next instruction the
CPU will execute. Each instruction is accessed in 16 bits (1 word), so the least significant bit of
the PC is ignored (always regarded as 0).
(2) Condition Code Register (CCR): This 8-bit register contains internal status information,
including carry (C), overflow (V), zero (Z), negative (N), and half-carry (H) flags and the interrupt
mask bit (I).
Bit 7—Interrupt Mask Bit (I): When this bit is set to 1, all interrupts except NMI are masked.
This bit is set to 1 automatically by a reset and at the start of interrupt handling.
21
Bit 6—User Bit (U): This bit can be written and read by software (using the LDC, STC, ANDC,
ORC, and XORC instructions).
Bit 5—Half-Carry Flag (H): This flag is set to 1 when the ADD.B, ADDX.B, SUB.B, SUBX.B,
NEG.B, or CMP.B instruction causes a carry or borrow out of bit 3, and is cleared to 0 otherwise.
Similarly, it is set to 1 when the ADD.W, SUB.W, or CMP.W instruction causes a carry or borrow
out of bit 11, and cleared to 0 otherwise. It is used implicitly in the DAA and DAS instructions.
Bit 4—User Bit (U): This bit can be written and read by software (using the LDC, STC, ANDC,
ORC, and XORC instructions).
Bit 3—Negative Flag (N): This flag indicates the most significant bit (sign bit) of the result of an
instruction.
Bit 2—Zero Flag (Z): This flag is set to 1 to indicate a zero result and cleared to 0 to indicate a
nonzero result.
Bit 1—Overflow Flag (V): This flag is set to 1 when an arithmetic overflow occurs, and cleared
to 0 at other times.
Bit 0—Carry Flag (C): This flag is used by:
• Add and subtract instructions, to indicate a carry or borrow at the most significant bit of the
result
• Shift and rotate instructions, to store the value shifted out of the most significant or least
significant bit
• Bit manipulation and bit load instructions, as a bit accumulator
The LDC, STC, ANDC, ORC, and XORC instructions enable the CPU to load and store the CCR,
and to set or clear selected bits by logic operations. The N, Z, V, and C flags are used in
conditional branching instructions (Bcc).
For the action of each instruction on the flag bits, see the H8/300 Series Programming Manual.
2.2.3
Initial Register Values
When the CPU is reset, the program counter (PC) is loaded from the vector table and the interrupt
mask bit (I) in the CCR is set to 1. The other CCR bits and the general registers are not initialized.
In particular, the stack pointer (R7) is not initialized. The stack pointer should be initialized by
software, by the first instruction executed after a reset.
22
2.3
Data Formats
The H8/300 CPU can process 1-bit data, 4-bit (BCD) data, 8-bit (byte) data, and 16-bit (word)
data.
• Bit manipulation instructions operate on 1-bit data specified as bit n (n = 0, 1, 2, ..., 7) in a byte
operand.
• All arithmetic and logic instructions except ADDS and SUBS can operate on byte data.
• The DAA and DAS instructions perform decimal arithmetic adjustments on byte data in
packed BCD form. Each nibble of the byte is treated as a decimal digit.
• The MOV.W, ADD.W, SUB.W, CMP.W, ADDS, SUBS, MULXU (8 bits × 8 bits), and
DIVXU (16 bits ÷ 8 bits) instructions operate on word data.
23
2.3.1
Data Formats in General Registers
Data of all the sizes above can be stored in general registers as shown in figure 2.3.
Data Type
Register No.
Data Format
7
1-bit data
RnH
7
0
6
5
4
3
2
1
0
Don’t care
7
1-bit data
RnL
Byte data
RnH
Byte data
RnL
Word data
Rn
Don’t care
7
0
MSB
LSB
Don’t care
RnH
6
5
2
1
0
7
0
MSB
LSB
15
0
LSB
4
3
Upper digit
0
Lower digit
Don’t care
Don’t care
RnL
4
Upper digit
Legend
RnH: Upper digit of general register
RnL: Lower digit of general register
MSB: Most significant bit
LSB: Least significant bit
Figure 2.3 Register Data Formats
24
3
Don’t care
7
4-bit BCD data
4
MSB
7
4-bit BCD data
0
7
0
3
Lower digit
2.3.2
Memory Data Formats
Figure 2.4 indicates the data formats in memory.
Word data stored in memory must always begin at an even address. In word access the least
significant bit of the address is regarded as 0. If an odd address is specified, no address error
occurs but the access is performed at the preceding even address. This rule affects MOV.W
instructions and branching instructions, and implies that only even addresses should be stored in
the vector table.
Data Type
Address
Data Format
7
1-bit data
Address n
7
Byte data
Address n
MSB
Even address
MSB
Word data
Odd address
Byte data (CCR) on stack
Word data on stack
0
6
5
4
3
2
1
0
LSB
Upper 8 bits
Lower 8 bits
LSB
MSB
CCR
LSB
Odd address
MSB
CCR*
LSB
Even address
MSB
Even address
Odd address
LSB
Note: * Ignored on return
Legend
CCR: Condition code register
Figure 2.4 Memory Data Formats
When the stack is addressed by register R7, it must always be accessed a word at a time. When the
CCR is pushed on the stack, two identical copies of the CCR are pushed to make a complete word.
When they are restored, the lower byte is ignored.
25
2.4
Addressing Modes
2.4.1
Addressing Mode
The H8/300 CPU supports eight addressing modes. Each instruction uses a subset of these
addressing modes.
Table 2.1
Addressing Modes
No.
Addressing Mode
Symbol
(1)
Register direct
Rn
(2)
Register indirect
@Rn
(3)
Register indirect with displacement
@(d:16, Rn)
(4)
Register indirect with post-increment
@Rn+
Register indirect with pre-decrement
@–Rn
(5)
Absolute address
@aa:8 or @aa:16
(6)
Immediate
#xx:8 or #xx:16
(7)
Program-counter-relative
@(d:8, PC)
(8)
Memory indirect
@@aa:8
(1) Register Direct—Rn: The register field of the instruction specifies an 8- or 16-bit general
register containing the operand. In most cases the general register is accessed as an 8-bit register.
Only the MOV.W, ADD.W, SUB.W, CMP.W, ADDS, SUBS, MULXU (8 bits × 8 bits), and
DIVXU (16 bits ÷ 8 bits) instructions have 16-bit operands.
(2) Register indirect—@Rn: The register field of the instruction specifies a 16-bit general
register containing the address of the operand.
(3) Register Indirect with Displacement—@(d:16, Rn): This mode, which is used only in
MOV instructions, is similar to register indirect but the instruction has a second word (bytes 3 and
4) which is added to the contents of the specified general register to obtain the operand address.
For the MOV.W instruction, the resulting address must be even.
(4) Register Indirect with Post-Increment or Pre-Decrement—@Rn+ or @–Rn:
• Register Indirect with Post-Increment—@Rn+
The @Rn+ mode is used with MOV instructions that load registers from memory.
It is similar to the register indirect mode, but the 16-bit general register specified in the register
field of the instruction is incremented after the operand is accessed. The size of the increment
is 1 or 2 depending on the size of the operand: 1 for MOV.B; 2 for MOV.W. For MOV.W, the
original contents of the 16-bit general register must be even.
26
• Register Indirect with Pre-Decrement—@–Rn
The @–Rn mode is used with MOV instructions that store register contents to memory.
It is similar to the register indirect mode, but the 16-bit general register specified in the register
field of the instruction is decremented before the operand is accessed. The size of the
decrement is 1 or 2 depending on the size of the operand: 1 for MOV.B; 2 for MOV.W. For
MOV.W, the original contents of the 16-bit general register must be even.
(5) Absolute Address—@aa:8 or @aa:16: The instruction specifies the absolute address of the
operand in memory. The MOV.B instruction uses an 8-bit absolute address of the form H'FFxx.
The upper 8 bits are assumed to be 1, so the possible address range is H'FF00 to H'FFFF (65280 to
65535). The MOV.B, MOV.W, JMP, and JSR instructions can use 16-bit absolute addresses.
(6) Immediate—#xx:8 or #xx:16: The instruction contains an 8-bit operand in its second byte, or
a 16-bit operand in its third and fourth bytes. Only MOV.W instructions can contain 16-bit
immediate values.
The ADDS and SUBS instructions implicitly contain the value 1 or 2 as immediate data. Some bit
manipulation instructions contain 3-bit immediate data (#xx:3) in the second or fourth byte of the
instruction, specifying a bit number.
(7) Program-Counter-Relative—@(d:8, PC): This mode is used to generate branch addresses
in the Bcc and BSR instructions. An 8-bit value in byte 2 of the instruction code is added as a
sign-extended value to the program counter contents. The result must be an even number. The
possible branching range is –126 to +128 bytes (–63 to +64 words) from the current address.
(8) Memory Indirect—@@aa:8: This mode can be used by the JMP and JSR instructions. The
second byte of the instruction code specifies an 8-bit absolute address from H'0000 to H'00FF (0
to 255). The word located at this address contains the branch address. The upper 8 bits of the
absolute address are 0 (H'00), thus the branch address is limited to values from 0 to 255 (H'0000 to
H'00FF). Note that some addresses in this area are also located in the vector table. See section 3.4,
Address Space Map in Each Operating Mode, for details.
If an odd address is specified as a branch destination or as the operand address of a MOV.W
instruction, the least significant bit is regarded as 0, causing word access to be performed at the
address preceding the specified address. See section 2.3.2, Memory Data Formats, for further
information.
27
2.4.2
Calculation of Effective Address
Table 2.2 shows how the H8/300 calculates effective addresses in each addressing mode.
Arithmetic, logic, and shift instructions use register direct addressing (1). The ADD.B, ADDX.B,
SUBX.B, CMP.B, AND.B, OR.B, and XOR.B instructions can also use immediate addressing (6).
The MOV instruction uses all the addressing modes except program-counter relative (7) and
memory indirect (8).
Bit manipulation instructions use register direct (1), register indirect (2), or 8-bit absolute (5)
addressing to identify a byte operand, and 3-bit immediate addressing to identify a bit within the
byte. The BSET, BCLR, BNOT, and BTST instructions can also use register direct addressing (1)
to identify the bit.
28
Table 2.2
Effective Address Calculation
No.
Addressing Mode and
Instruction Format
1
Register direct, Rn
Effective Address
Calculation
Effective Address
3
regm
15
87
op
2
43
regm regn
op
3
15
0
15
0
15
0
15
0
15
0
0
reg
Register indirect with
displacement, @(d:16, Rn)
15
0
16-bit register contents
15
0
regn
Operands are contained
in registers regm and regn
16-bit register contents
76 43
3
0
Register indirect, @Rn
15
0
76 43
op
0
reg
disp
disp
4
Register indirect with
post-increment, @Rn+
15
76 43
op
15
0
16-bit register contents
0
reg
1 or 2*
Register indirect with
pre-decrement, @–Rn
15
0
16-bit register contents
15
76 43
op
0
reg
1 or 2*
Note: * 1 for a byte operand,
2 for a word operand
29
Table 2.2
No.
5
Effective Address Calculation (cont)
Addressing Mode and
Instruction Format
Effective Address
Calculation
Effective Address
Absolute address
@aa:8
15
87
op
15
87
0
H'FF
0
abs
@aa:16
15
15
0
0
op
abs
6
Immediate
#xx:8
Operand is 1- or 2-byte
immediate data
15
87
op
0
IMM
#xx:16
15
0
op
IMM
7
15
0
PC contents
15
87
op
30
15
PC-relative
@(d:8, PC)
0
disp
Sign
extension
disp
0
Table 2.2
Effective Address Calculation (cont)
No.
Addressing Mode and
Instruction Format
8
Memory indirect, @@aa:8
15
87
op
Effective Address
Calculation
Effective Address
0
abs
15
87
0
H'00
15
0
Memory contents
(16 bits)
Legend
reg: General register
op: Operation code
disp: Displacement
IMM: Immediate data
abs: Absolute address
31
2.5
Instruction Set
The H8/300 CPU has 57 types of instructions, which are classified by function in table 2.3.
Table 2.3
Instruction Classification
Function
Instructions
Types
3
3
1
1
Data transfer
MOV, MOVTPE* , MOVFPE* , PUSH* , POP*
3
Arithmetic operations
ADD, SUB, ADDX, SUBX, INC, DEC, ADDS, SUBS,
DAA, DAS, MULXU, DIVXU, CMP, NEG
14
Logic operations
AND, OR, XOR, NOT
4
Shift
SHAL, SHAR, SHLL, SHLR, ROTL, ROTR, ROTXL,
ROTXR
8
Bit manipulation
BSET, BCLR, BNOT, BTST, BAND, BIAND, BOR,
BIOR, BXOR, BIXOR, BLD, BILD, BST, BIST
14
Branch
Bcc* 2, JMP, BSR, JSR, RTS
5
System control
RTE, SLEEP, LDC, STC, ANDC, ORC, XORC, NOP
8
Block data transfer
EEPMOV
1
Total 57
Notes: 1. PUSH Rn is equivalent to MOV.W Rn, @–SP.
POP Rn is equivalent to MOV.W @SP+, Rn.
2. Bcc is a conditional branch instruction in which cc represents a condition code.
3. Not supported by the H8/3318.
32
The following sections give a concise summary of the instructions in each category, and indicate
the bit patterns of their object code. The notation used is defined next.
Operation Notation
Rd
General register (destination)
Rs
General register (source)
Rn
General register
(EAd)
Destination operand
(EAs)
Source operand
SP
Stack pointer
PC
Program counter
CCR
Condition code register
N
N (negative) flag of CCR
Z
Z (zero) flag of CCR
V
V (overflow) flag of CCR
C
C (carry) flag of CCR
#imm
Immediate data
#xx:3
3-bit immediate data
#xx:8
8-bit immediate data
#xx:16
16-bit immediate data
disp
Displacement
+
Addition
–
Subtraction
×
Multiplication
÷
Division
∧
AND logical
∨
OR logical
⊕
Exclusive OR logical
→
Move
¬
Not
33
2.5.1
Data Transfer Instructions
Table 2.4 describes the data transfer instructions. Figure 2.5 shows their object code formats.
Table 2.4
Data Transfer Instructions
Instruction
Size*
Function
MOV
B/W
(EAs) → Rd, Rs → (EAd)
Moves data between two general registers or between a general
register and memory, or moves immediate data to a general register.
The Rn, @Rn, @(d:16, Rn), @aa:16, #xx:8 or #xx:16, @–Rn, and
@Rn+ addressing modes are available for byte or word data. The
@aa:8 addressing mode is available for byte data only.
The @–R7 and @R7+ modes require word operands. Do not specify
byte size for these two modes.
MOVTPE
B
Not supported by the H8/3318.
MOVFPE
B
Not supported by the H8/3318.
PUSH
W
Rn → @–SP
Pushes a 16-bit general register onto the stack. Equivalent to
MOV.W Rn, @–SP.
POP
W
@SP+ → Rn
Pops a 16-bit general register from the stack. Equivalent to MOV.W
@SP+, Rn.
Note: * Size: Operand size
B: Byte
W: Word
34
15
8
7
op
0
rm
15
8
8
Rm→Rn
7
op
15
rn
0
rm
rn
rm
rn
@Rm←→Rn
7
op
MOV
0
@(d:16, Rm)←→Rn
disp
15
8
7
op
rm
15
8
op
0
7
rn
15
@Rm+→Rn, or
Rn→@–Rm
rn
0
abs
8
@aa:8←→Rn
7
0
op
rn
@aa:16←→Rn
abs
15
8
op
7
rn
15
0
IMM
8
#xx:8→Rn
7
0
op
rn
#xx:16→Rn
IMM
15
8
7
op
0
rn
MOVFPE, MOVTPE
abs
15
8
op
7
0
rn
POP, PUSH
Legend
op:
Operation field
rm, rn: Register field
disp: Displacement
abs:
Absolute address
IMM: Immediate data
Figure 2.5 Data Transfer Instruction Codes
35
2.5.2
Arithmetic Operations
Table 2.5 describes the arithmetic instructions. See figure 2.6 in section 2.5.4, Shift Operations for
their object codes.
Table 2.5
Arithmetic Instructions
Instruction
Size*
Function
ADD
B/W
Rd ± Rs → Rd, Rd + #imm → Rd
SUB
ADDX
Performs addition or subtraction on data in two general registers, or
addition on immediate data and data in a general register.
Immediate data cannot be subtracted from data in a general register.
Word data can be added or subtracted only when both words are in
general registers.
B
SUBX
INC
Performs addition or subtraction with carry or borrow on byte data in
two general registers, or addition or subtraction on immediate data
and data in a general register.
B
DEC
ADDS
W
Rd ± 1 → Rd, Rd ± 2 → Rd
Adds or subtracts immediate data to or from data in a general
register. The immediate data must be 1 or 2.
B
DAS
MULXU
Rd ± 1 → Rd
Increments or decrements a general register.
SUBS
DAA
Rd ± Rs ± C → Rd, Rd ± #imm ± C → Rd
Rd decimal adjust → Rd
Decimal-adjusts (adjusts to packed BCD) an addition or subtraction
result in a general register by referring to the CCR.
B
Rd × Rs → Rd
Performs 8-bit × 8-bit unsigned multiplication on data in two general
registers, providing a 16-bit result.
DIVXU
B
Rd ÷ Rs → Rd
Performs 16-bit ÷ 8-bit unsigned division on data in two general
registers, providing an 8-bit quotient and 8-bit remainder.
CMP
B/W
Rd – Rs, Rd – #imm
Compares data in a general register with data in another general
register or with immediate data. Word data can be compared only
between two general registers.
NEG
B
0 – Rd → Rd
Obtains the two’s complement (arithmetic complement) of data in a
general register.
Note: * Size: Operand size
B: Byte
W: Word
36
2.5.3
Logic Operations
Table 2.6 describes the four instructions that perform logic operations. See figure 2.6 in
section 2.5.4, Shift Operations, for their object codes.
Table 2.6
Logic Operation Instructions
Instruction
Size*
Function
AND
B
Rd ∧ Rs → Rd, Rd ∧ #imm → Rd
Performs a logical AND operation on a general register and another
general register or immediate data.
OR
B
Rd ∨ Rs → Rd, Rd ∨ #imm → Rd
Performs a logical OR operation on a general register and another
general register or immediate data.
XOR
B
Rd ⊕ Rs → Rd, Rd ⊕ #imm → Rd
Performs a logical exclusive OR operation on a general register and
another general register or immediate data.
NOT
B
¬ (Rd) → (Rd)
Obtains the one’s complement (logical complement) of general
register contents.
Note: * Size: Operand size
B: Byte
37
2.5.4
Shift Operations
Table 2.7 describes the eight shift instructions. Figure 2.6 shows the object code formats of the
arithmetic, logic, and shift instructions.
Table 2.7
Shift Instructions
Instruction
Size*
Function
SHAL
B
Rd shift → Rd
SHAR
SHLL
Performs an arithmetic shift operation on general register contents.
B
SHLR
ROTL
Performs a logical shift operation on general register contents.
B
ROTR
ROTXL
Rd rotate → Rd
Rotates general register contents.
B
ROTXR
Note: * Size: Operand size
B: Byte
38
Rd shift → Rd
Rd rotate through carry → Rd
Rotates general register contents through the C (carry) bit.
15
8
7
op
0
rm
15
8
7
0
op
15
7
op
0
rm
8
op
rn
7
MULXU, DIVXU
0
rn
ADD, ADDX, SUBX,
CMP (#xx:8)
IMM
15
8
7
op
0
rm
15
8
op
ADDS, SUBS, INC, DEC,
DAA, DAS, NEG, NOT
rn
8
15
ADD, SUB, CMP,
ADDX, SUBX (Rm)
rn
7
rn
15
AND, OR, XOR (Rm)
0
IMM
8
op
rn
AND, OR, XOR (#xx:8)
7
0
rn
SHAL, SHAR, SHLL, SHLR,
ROTL, ROTR, ROTXL, ROTXR
Legend
Operation field
op:
rm, rn: Register field
IMM: Immediate data
Figure 2.6 Arithmetic, Logic, and Shift Instruction Codes
39
2.5.5
Bit Manipulations
Table 2.8 describes the bit-manipulation instructions. Figure 2.7 shows their object code formats.
Table 2.8
Bit-Manipulation Instructions
Instruction
Size*
Function
BSET
B
1 → (<bit no.> of <EAd>)
Sets a specified bit in a general register or memory to 1. The bit is
specified by a bit number, given in 3-bit immediate data or the lower
three bits of a general register.
BCLR
B
0 → (<bit no.> of <EAd>)
Clears a specified bit in a general register or memory to 0. The bit is
specified by a bit number, given in 3-bit immediate data or the lower
three bits of a general register.
BNOT
B
¬ (<bit no.> of <EAd>) → (<bit no.> of <EAd>)
Inverts a specified bit in a general register or memory. The bit is
specified by a bit number, given in 3-bit immediate data or the lower
three bits of a general register
BTST
B
¬ (<bit no.> of <EAd>) → Z
Tests a specified bit in a general register or memory and sets or
clears the Z flag accordingly. The bit is specified by a bit number,
given in 3-bit immediate data or the lower three bits of a general
register.
BAND
B
C ∧ (<bit no.> of <EAd>) → C
ANDs the C flag with a specified bit in a general register or memory.
C ∧ [¬ (<bit no.> of <EAd>)] → C
BIAND
ANDs the C flag with the inverse of a specified bit in a general
register or memory.
The bit number is specified by 3-bit immediate data.
BOR
B
C ∨ (<bit no.> of <EAd>) → C
ORs the C flag with a specified bit in a general register or memory.
C ∨ [¬ (<bit no.> of <EAd>)] → C
BIOR
ORs the C flag with the inverse of a specified bit in a general register
or memory.
The bit number is specified by 3-bit immediate data.
BXOR
B
C ⊕ (<bit no.> of <EAd>) → C
XORs the C flag with a specified bit in a general register or memory.
Note: * Size: Operand size
B: Byte
40
Table 2.8
Bit-Manipulation Instructions (cont)
Instruction
Size*
Function
BIXOR
B
C ⊕ ¬ [(<bit no.> of <EAd>)] → C
XORs the C flag with the inverse of a specified bit in a general
register or memory.
The bit number is specified by 3-bit immediate data.
BLD
(<bit no.> of <EAd>) → C
B
Copies a specified bit in a general register or memory to the C flag.
¬ (<bit no.> of <EAd>) → C
BILD
Copies the inverse of a specified bit in a general register or memory
to the C flag.
The bit number is specified by 3-bit immediate data.
BST
C → (<bit no.> of <EAd>)
B
Copies the C flag to a specified bit in a general register or memory.
¬ C → (<bit no.> of <EAd>)
BIST
Copies the inverse of the C flag to a specified bit in a general
register or memory.
The bit number is specified by 3-bit immediate data.
Note: * Size: Operand size
B: Byte
Notes on Bit Manipulation Instructions: BSET, BCLR, BNOT, BST, and BIST are readmodify-write instructions. They read a byte of data, modify one bit in the byte, then write the byte
back. Care is required when these instructions are applied to registers with write-only bits and to
the I/O port registers.
Step
Description
1
Read
Read one data byte at the specified address
2
Modify
Modify one bit in the data byte
3
Write
Write the modified data byte back to the specified address
Example 1: BCLR is executed to clear bit 0 in the port 4 data direction register (P4DDR) under
the following conditions.
P4 7:
Input pin, low
P4 6:
Input pin, high
P4 5 – P4 0: Output pins, low
The intended purpose of this BCLR instruction is to switch P40 from output to input.
41
Before Execution of BCLR Instruction
P47
P46
P45
P44
P43
P42
P41
P40
Input/output
Input
Input
Output
Output
Output
Output
Output
Output
Pin state
Low
High
Low
Low
Low
Low
Low
Low
DDR
0
0
1
1
1
1
1
1
DR
1
0
0
0
0
0
0
0
Execution of BCLR Instruction
BCLR
; clear bit 0 in data direction register
#0, @P4DDR
After Execution of BCLR Instruction
P47
P46
P45
P44
P43
P42
P41
P40
Input/output
Output
Output
Output
Output
Output
Output
Output
Input
Pin state
Low
High
Low
Low
Low
Low
Low
High
DDR
1
1
1
1
1
1
1
0
DR
1
0
0
0
0
0
0
0
Explanation: To execute the BCLR instruction, the CPU begins by reading P4DDR. Since
P4DDR is a write-only register, it is read as H'FF, even though its true value is H'3F.
Next the CPU clears bit 0 of the read data, changing the value to H'FE.
Finally, the CPU writes this value (H'FE) back to P4DDR to complete the BCLR instruction.
As a result, P40DDR is cleared to 0, making P40 an input pin. In addition, P47DDR and P46DDR
are set to 1, making P4 7 and P46 output pins.
42
BSET, BCLR, BNOT, BTST
15
8
7
op
0
IMM
15
8
7
op
0
rm
15
8
Operand: register direct (Rn)
Bit No.: immediate (#xx:3)
rn
Operand: register direct (Rn)
Bit No.: register direct (Rm)
rn
7
op
0
rn
0
0
0
0 Operand: register indirect (@Rn)
IMM
0
0
0
0 Bit No.:
op
rn
0
0
0
0 Operand: register indirect (@Rn)
op
rm
0
0
0
0 Bit No.:
op
15
8
15
8
7
0
7
abs
IMM
15
8
0
Operand: absolute (@aa:8)
0
0
7
0 Bit No.:
immediate (#xx:3)
0
op
abs
op
register direct (Rm)
0
op
op
immediate (#xx:3)
rm
0
Operand: absolute (@aa:8)
0
0
0 Bit No.:
register direct (Rm)
BAND, BOR, BXOR, BLD, BST
15
8
7
op
0
IMM
15
8
7
op
op
15
8
Operand: register direct (Rn)
Bit No.: immediate (#xx:3)
rn
0
rn
0
0
0
0 Operand: register indirect (@Rn)
IMM
0
0
0
0 Bit No.:
7
0
op
abs
op
immediate (#xx:3)
IMM
0
Operand: absolute (@aa:8)
0
0
0 Bit No.:
immediate (#xx:3)
Legend
op:
Operation field
rm, rn: Register field
abs:
Absolute address
IMM: Immediate data
Figure 2.7 Bit Manipulation Instruction Codes
43
BIAND, BIOR, BIXOR, BILD, BIST
15
8
7
op
0
IMM
15
8
7
op
op
15
8
Operand: register direct (Rn)
Bit No.: immediate (#xx:3)
rn
0
rn
0
0
0
0 Operand: register indirect (@Rn)
IMM
0
0
0
0 Bit No.:
7
0
op
abs
op
immediate (#xx:3)
IMM
0
Operand: absolute (@aa:8)
0
0
0 Bit No.:
immediate (#xx:3)
Legend
op:
Operation field
rm, rn: Register field
abs:
Absolute address
IMM: Immediate data
Figure 2.7 Bit Manipulation Instruction Codes (cont)
44
2.5.6
Branching Instructions
Table 2.9 describes the branching instructions. Figure 2.8 shows their object code formats.
Table 2.9
Branching Instructions
Instruction
Size
Function
Bcc
—
Branches if condition cc is true.
Mnemonic
cc field
Description
Condition
BRA (BT)
0000
Always (true)
Always
BRN (BF)
0001
Never (false)
Never
BHI
0010
High
C∨Z=0
BLS
0011
Low or same
C∨Z=1
BCC (BHS)
0100
Carry clear
(High or same)
C=0
BCS (BLO)
0101
Carry set (low)
C=1
BNE
0110
Not equal
Z=0
BEQ
0111
Equal
Z=1
BVC
1000
Overflow clear
V=0
BVS
1001
Overflow set
V=1
BPL
1010
Plus
N=0
BMI
1011
Minus
N=1
BGE
1100
Greater or equal
N⊕V=0
BLT
1101
Less than
N⊕V=1
BGT
1110
Greater than
Z ∨ (N ⊕ V) = 0
BLE
1111
Less or equal
Z ∨ (N ⊕ V) = 1
JMP
—
Branches unconditionally to a specified address.
JSR
—
Branches to a subroutine at a specified address.
BSR
—
Branches to a subroutine at a specified displacement from the
current address.
RTS
—
Returns from a subroutine.
45
15
8
op
7
0
cc
15
disp
8
7
op
0
rm
15
Bcc
8
0
0
0
7
0
JMP (@Rm)
0
op
JMP (@aa:16)
abs
15
8
7
0
op
abs
15
8
JMP (@@aa:8)
7
0
op
disp
15
8
7
op
0
rm
15
BSR
8
0
0
0
7
0
JSR (@Rm)
0
op
JSR (@aa:16)
abs
15
8
7
op
0
abs
15
8
7
op
Legend
op: Operation field
cc: Condition field
rm: Register field
disp: Displacement
abs: Absolute address
Figure 2.8 Branching Instruction Codes
46
JSR (@@aa:8)
0
RTS
2.5.7
System Control Instructions
Table 2.10 describes the system control instructions. Figure 2.9 shows their object code formats.
Table 2.10 System Control Instructions
Instruction
Size*
Function
RTE
—
Returns from an exception-handling routine.
SLEEP
—
Causes a transition to the power-down state.
LDC
B
Rs → CCR, #imm → CCR
Moves immediate data or general register contents to the condition
code register.
STC
CCR → Rd
B
Copies the condition code register to a specified general register.
ANDC
CCR ∧ #imm → CCR
B
Logically ANDs the condition code register with immediate data.
ORC
CCR ∨ #imm → CCR
B
Logically ORs the condition code register with immediate data.
XORC
CCR ⊕ #imm → CCR
B
Logically exclusive-ORs the condition code register with immediate
data.
NOP
PC + 2 → PC
—
Only increments the program counter.
Note: * Size: Operand size
B: Byte
15
8
7
0
op
15
8
RTE, SLEEP, NOP
7
0
op
15
rn
8
op
7
LDC, STC (Rn)
0
IMM
ANDC, ORC,
XORC, LDC (#xx:8)
Legend
op: Operation field
rn: Register field
IMM: Immediate data
Figure 2.9 System Control Instruction Codes
47
2.5.8
Block Data Transfer Instruction
Table 2.11 describes the EEPMOV instruction. Figure 2.10 shows its object code format.
Table 2.11 Block Data Transfer Instruction/EEPROM Write Operation
Instruction
Size
Function
EEPMOV
—
if R4L ≠ 0 then
repeat
until
@R5+ → @R6+
R4L – 1 → R4L
R4L = 0
else next;
Moves a data block according to parameters set in general registers
R4L, R5, and R6.
R4L: size of block (bytes)
R5: starting source address
R6: starting destination address
Execution of the next instruction starts as soon as the block transfer
is completed.
15
8
7
0
op
op
Legend
op: Operation field
Figure 2.10 Block Data Transfer Instruction/EEPROM Write Operation Code
48
Notes on EEPMOV Instruction
1. The EEPMOV instruction is a block data transfer instruction. It moves the number of bytes
specified by R4L from the address specified by R5 to the address specified by R6.
R5 →
← R6
R5 + R4L →
← R6 + R4L
2. When setting R4L and R6, make sure that the final destination address (R6 + R4L) does not
exceed H'FFFF. The value in R6 must not change from H'FFFF to H'0000 during execution of
the instruction.
R5 →
R5 + R4L →
← R6
H'FFFF
Not allowed
← R6 + R4L
49
2.6
CPU States
2.6.1
Overview
The CPU has three states: the program execution state, exception-handling state, and power-down
state. The power-down state is further divided into three modes: sleep mode, software standby
mode, and hardware standby mode. Figure 2.11 summarizes these states, and figure 2.12 shows a
map of the state transitions.
State
Program execution state
The CPU executes successive program instructions.
Exception-handling state
A transient state triggered by a reset or interrupt. The CPU executes
a hardware sequence that includes loading the program counter from
the vector table.
Sleep mode
Power-down state
A state in which some or
all of the chip functions are
stopped to conserve power.
Software standby mode
Hardware standby mode
Figure 2.11 Operating States
50
Exception
handing
request
Program
execution state
Exception
handing
Exceptionhandling state
RES = 1
Reset state
Interrupt request
NMI, IRQ0
to IRQ2, or IRQ6
STBY = 1, RES = 0
SLEEP instruction
with SSBY bit set
SLEEP
instruction
Sleep mode
Software
standby mode
Hardware
standby mode
Power-down state
Notes: 1. A transition to the reset state occurs when RES goes low, except when the chip
is in the hardware standby mode.
2. A transition from any state to the hardware standby mode occurs when STBY
goes low.
Figure 2.12 State Transitions
2.6.2
Program Execution State
In this state the CPU executes program instructions.
2.6.3
Exception-Handling State
The exception-handling state is a transient state that occurs when the CPU is reset or interrupted
and changes its normal processing flow. In interrupt exception handling, the CPU references the
stack pointer (R7) and saves the program counter and condition code register on the stack. For
further details see section 4, Exception Handling.
51
2.6.4
Power-Down State
The power-down state includes three modes: sleep mode, software standby mode, and hardware
standby mode.
Sleep Mode: Is entered when a SLEEP instruction is executed. The CPU halts, but CPU register
contents remain unchanged and the on-chip supporting modules continue to function.
Software Standby Mode: Is entered if the SLEEP instruction is executed while the SSBY
(software standby) bit in the system control register (SYSCR) is set to 1. The CPU and all on-chip
supporting modules halt. The on-chip supporting modules are initialized, but the contents of the
on-chip RAM and CPU registers remain unchanged as long as a specified voltage is supplied. I/O
port outputs also remain unchanged.
Hardware Standby Mode: Is entered when the input at the STBY pin goes low. All chip
functions halt, including I/O port output. The on-chip supporting modules are initialized, but onchip RAM contents are held.
See section 18, Power-Down State, for further information.
2.7
Access Timing and Bus Cycle
The CPU is driven by the system clock (ø). The period from one rising edge of the system clock to
the next is referred to as a “state.” Memory access is performed in a two- or three-state bus cycle.
On-chip memory, on-chip supporting modules, and external devices are accessed in different bus
cycles as described below.
2.7.1
Access to On-Chip Memory (RAM and ROM)
On-chip ROM and RAM are accessed in a cycle of two states designated T1 and T2. Either byte or
word data can be accessed, via a 16-bit data bus. Figure 2.13 shows the on-chip memory access
cycle. Figure 2.14 shows the associated pin states.
52
Bus cycle
T2 state
T1 state
ø
Address
Internal address bus
Internal read signal
Read data
Internal data bus (read)
Internal write signal
Internal data bus (write)
Write data
Figure 2.13 On-Chip Memory Access Cycle
Bus cycle
T2 state
T1 state
ø
Address bus
Address
AS: High
RD: High
WR: High
Data bus:
high impedance state
Figure 2.14 Pin States during On-Chip Memory Access Cycle
53
2.7.2
Access to On-Chip Register Field and External Devices
The on-chip supporting module registers and external devices are accessed in a cycle consisting of
three states: T1, T2, and T3. Only one byte of data can be accessed per cycle, via an 8-bit data bus.
Access to word data or instruction codes requires two consecutive cycles (six states). Figure 2.15
shows the access cycle for the on-chip register field. Figure 2.16 shows the associated pin states.
Figures 2.17 (a) and (b) show the read and write access timing for external devices.
Bus cycle
T1 state
T2 state
T3 state
ø
Internal address
bus
Address
Internal read
signal
Internal data bus
(read)
Read data
Internal write
signal
Internal data bus
(write)
Write data
Figure 2.15 On-Chip Register Field Access Cycle
54
Bus cycle
T1 state
T2 state
T3 state
ø
Address
Address bus
AS: High
RD: High
WR: High
Data bus:
high impedance state
Figure 2.16 Pin States during On-Chip Register Field Access Cycle
Read cycle
T1 state
T2 state
T3 state
ø
Address bus
Address
AS
RD
WR: High
Data bus
Read data
Figure 2.17 (a) External Device Access Timing (Read)
55
Write cycle
T1 state
T2 state
T3 state
ø
Address bus
Address
AS
RD: High
WR
Data bus
Write data
Figure 2.17 (b) External Device Access Timing (Write)
56
Section 3 MCU Operating Modes and Address Space
3.1
Overview
3.1.1
Mode Selection
The H8/3318 operates in three modes numbered 1, 2, and 3. The mode is selected by the inputs at
the mode pins (MD1 and MD 0) when the chip comes out of a reset. See table 3.1.
Table 3.1
Operating Modes
Mode
MD1
MD0
Address Space
On-Chip ROM
On-Chip RAM
Mode 0
Low
Low
—
—
—
Mode 1
Low
High
Expanded
Disabled
Enabled*
Mode 2
High
Low
Expanded
Enabled
Enabled*
Mode 3
High
High
Single-chip
Enabled
Enabled
Note: * If the RAME bit in the system control register (SYSCR) is cleared to 0, off-chip memory can
be accessed instead.
Modes 1 and 2 are expanded modes that permit access to off-chip memory and peripheral devices.
The maximum address space supported by these externally expanded modes is 64 kbytes.
In mode 3 (single-chip mode), only on-chip ROM and RAM and the on-chip register field are
used. All ports are available for general-purpose input and output.
Mode 0 is inoperative in the H8/3318. Avoid setting the mode pins to mode 0. In addition, the
mode pins must not be changed during MCU operation.
3.1.2
Mode and System Control Registers
Table 3.2 lists the registers related to the chip’s operating mode: the system control register
(SYSCR) and mode control register (MDCR). The mode control register indicates the inputs to the
mode pins MD1 and MD 0.
Table 3.2
Mode and System Control Registers
Name
Abbreviation
Read/Write
Address
System control register
SYSCR
R/W
H'FFC4
Mode control register
MDCR
R
H'FFC5
57
3.2
System Control Register (SYSCR)
Bit
7
6
5
4
3
2
1
0
SSBY
STS2
STS1
STS0
XRST
NMIEG
DPME
RAME
Initial value
0
0
0
0
1
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
The system control register (SYSCR) is an 8-bit register that controls the operation of the chip.
Bit 7—Software Standby (SSBY): Enables transition to the software standby mode. For details,
see section 18, Power-Down State.
On recovery from software standby mode by an external interrupt, the SSBY bit remains set to 1.
It can be cleared by writing 0.
Bit 7
SSBY
Description
0
The SLEEP instruction causes a transition to sleep mode
1
The SLEEP instruction causes a transition to software standby mode
(Initial value)
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the clock settling
time when the chip recovers from the software standby mode by an external interrupt. During the
selected time the CPU and on-chip supporting modules continue to stand by. These bits should be
set according to the clock frequency so that the settling time is at least 8 ms. For specific settings,
see section 18.3.3, Clock Settling Time for Exit from Software Standby Mode.
Bit 6
STS2
Bit 5
STS1
Bit 4
STS0
Description
0
0
0
Settling time = 8,192 states
1
Settling time = 16,384 states
0
Settling time = 32,768 states
1
Settling time = 65,536 states
0
—
Settling time = 131,072 states
1
—
Prohibited
1
1
58
(Initial value)
Bit 3—External Reset (XRST): Indicates the source of a reset. A reset can be triggered by an
external reset input, or by a watchdog timer overflow when the watchdog timer is in operation.
XRST is set to 1 by an external reset, and cleared to 0 by a watchdog timer overflow.
Bit 3
XRST
Description
0
Reset generated by watchdog timer overflow
1
Reset generated by external reset input
(Initial value)
Bit 2—NMI Edge (NMIEG): Selects the valid edge of the NMI input.
Bit 2
NMIEG
Description
0
An interrupt is requested on the falling edge of the NMI input
1
An interrupt is requested on the rising edge of the NMI input
(Initial value)
Bit 1—Dual-Port RAM Mode Enable (DPME): Selects whether to put the chip into slave mode.
Bit 1
DPME
Description
0
The chip is not put into slave mode
1
The chip is put into slave mode
(Initial value)
Bit 0—RAM Enable (RAME): Enables or disables the on-chip RAM. The RAME bit is
initialized by the rising edge of the RES signal, but is not initialized in the software standby mode.
Bit 0
RAME
Description
0
The on-chip RAM is disabled
1
The on-chip RAM is enabled
(Initial value)
59
3.3
Mode Control Register (MDCR)
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
MDS1
MDS0
Initial value
1
1
1
0
0
1
*
*
Read/Write
—
—
—
—
—
—
R
R
Note: * Initialized according to MD1 and MD0 inputs.
The mode control register (MDCR) is an 8-bit register that indicates the operating mode of the
chip.
Bits 7 to 5—Reserved: These bits cannot be modified and are always read as 1.
Bits 4 and 3—Reserved: These bits cannot be modified and are always read as 0.
Bit 2—Reserved: This bit cannot be modified and is always read as 1.
Bits 1 and 0—Mode Select 1 and 0 (MDS1 and MDS0): These bits indicate the values of the
mode pins (MD1 and MD0), thereby indicating the current operating mode of the chip. MDS1
corresponds to MD1 and MDS0 to MD0. These bits can be read but not written. When the mode
control register is read, the levels at the mode pins (MD1 and MD 0) are latched in these bits.
60
3.4
Address Space Map in Each Operating Mode
Figure 3.1 shows memory map of the H8/3318 in modes 1, 2, and 3.
Mode 1
Expanded mode without
on-chip ROM
H'0000
Mode 2
Expanded mode with
on-chip ROM
H'0000
Vector table
H'0059
H'005A
H'0000
Vector table
H'0059
H'005A
External address
space
H'EF7F
H'EF80
On-chip RAM*,
4 kbyte
H'FF7F
H'FF80 External address space
H'FF87
H'FF88
On-chip register field
H'FFFF
Vector table
H'0059
H'005A
On-chip ROM,
60 kbytes
On-chip ROM,
58 kbytes
H'E77F
H'E780
H'EF7F
H'EF80
Mode 3
Single-chip mode
External address
space
H'EF7F
H'EF80
On-chip RAM*,
4 kbytes
On-chip RAM,
4 kbytes
H'FF7F
H'FF7F
H'FF80 External address space
H'FF87
H'FF88
H'FF88
On-chip register field
On-chip register field
H'FFFF
H'FFFF
Note: * External memory can be accessed at these addresses when the RAME bit in the system
control register (SYSCR) is cleared to 0.
Figure 3.1 H8/3318 Address Space Map
61
Section 4 Exception Handling
4.1
Overview
The H8/3318 recognizes only two kinds of exceptions: interrupts and the reset. Table 4.1 indicates
their priority and the timing of their hardware exception-handling sequence.
Table 4.1
Hardware Exception-Handling Sequences and Priority
Priority
Type of
Exception
Detection
Timing
Timing of Exception-Handling Sequence
High
Reset
Clock
synchronous
The hardware exception-handling sequence begins
as soon as RES changes from low to high.
Interrupt
On completion
of instruction
execution*
When an interrupt is requested, the hardware
exception-handling sequence begins at the end of
the current instruction, or at the end of the current
hardware exception-handling sequence.
Low
Note: * Not detected in the case of the ANDC, ORC, XORC, and LDC instructions.
4.2
Reset
4.2.1
Overview
A reset has the highest exception-handling priority. When the RES pin goes low or if the
watchdog timer overflows (when the watchdog timer reset option is selected), all current
processing stops and the chip enters the reset state. The internal state of the CPU and the registers
of the on-chip supporting modules are initialized. When RES returns from low to high or after
watchdog timer reset pulses have stopped, the reset exception-handling sequence starts.
4.2.2
Reset Sequence
The reset state begins when RES goes low or if there is a watchdog timer reset. To ensure correct
resetting, at power-on the RES pin should be held low for at least 20 ms. In a reset during
operation, the RES pin should be held low for at least 10 system clock cycles. Watchdog timer
reset pulse widths must be 518 system clock cycles. For the pin states during a reset, see appendix
D, Pin States.
When a reset occurs, hardware carries out the following reset exception-handling sequence.
63
1. The internal state of the CPU and the registers of the on-chip supporting modules are
initialized, and the I bit in the condition code register (CCR) is set to 1.
2. The CPU loads the program counter with the first word in the vector table (stored at addresses
H'0000 and H'0001) and starts program execution.
The RES pin should be held low when power is switched off, as well as when power is switched
on.
Figure 4.1 indicates the timing of the reset sequence in modes 2 and 3. Figure 4.2 indicates the
timing in mode 1.
Vector
Internal Instruction
fetch processing prefetch
RES/watchdog
reset (internal)
ø
Internal address
bus
(1)
(2)
Internal read
signal
Internal write
signal
Internal data bus
(16 bits)
(2)
(3)
(1) Reset vector address (H'0000)
(2) Starting address of program
(3) First instruction of program
Figure 4.1 Reset Sequence (Mode 2 or 3, Program Stored in On-Chip ROM)
64
Figure 4.2 Reset Sequence (Mode 1)
65
(1), (3)
(2), (4)
(5), (7)
(6), (8)
D7 to D0
(8 bits)
WR
(high)
RD
A15 to A0
ø
(2)
(1)
(4)
(3)
(6)
(5)
(8)
(7)
Instruction prefetch
Reset vector address: (1) = H'0000, (3) = H'0001
Starting address of program (contents of reset vector): (2) = upper byte, (4) = lower byte
Starting address of program: (5) = (2) (4), (7) = (2) (4) + 1
First instruction of program: (6) = first byte, (8) = second byte
RES/watchdog
reset (internal)
Vector fetch
Internal
processing
4.2.3
Disabling of Interrupts after Reset
After a reset, if an interrupt were to be accepted before initialization of the stack pointer (SP: R7),
the program counter and condition code register might not be saved correctly, leading to a
program crash. To prevent this, all interrupts, including NMI, are disabled immediately after a
reset. The first program instruction is therefore always executed. This instruction should initialize
the stack pointer (example: MOV.W #xx:16, SP).
To confirm the CCR contents after reset exception handling, a CCR manipulation instruction can
be executed before the instruction that initializes the stack pointer. All interrupts, including NMI,
are disabled immediately after execution of a CCR manipulation instruction. The next instruction
should be the instruction that initializes the stack pointer.
4.3
Interrupts
4.3.1
Overview
The interrupt sources include nine input pins for external interrupts (NMI, IRQ0 to IRQ7) and 33
internal sources in the on-chip supporting modules. Table 4.2 lists the interrupt sources in priority
order and gives their vector addresses. When two or more interrupts are requested, the interrupt
with highest priority is served first.
The features of these interrupts are:
• NMI has the highest priority and is always accepted. All internal and external interrupts except
NMI can be masked by the I bit in the CCR. When the I bit is set to 1, interrupts other than
NMI are not accepted.
• IRQ0 to IRQ7 can be sensed on the falling edge of the input signal, or level-sensed. The type of
sensing can be selected for each interrupt individually. NMI is edge-sensed, and either the
rising or falling edge can be selected.
• All interrupts are individually vectored. The software interrupt-handling routine does not have
to determine what type of interrupt has occurred.
• The watchdog timer can be used to generate either an NMI interrupt or OVF interrupt, as
needed. Refer to section 13, Watchdog Timer, for details.
66
Table 4.2
Interrupts
Interrupt Source
Vector No.
Vector Address
Priority
Reset
0
H'0000 to H'0001
High
Reserved
1 to 2
H'0002 to H'0005
NMI
3
H'0006 to H'0007
IRQ0
4
H'0008 to H'0009
IRQ1
5
H'000A to H'000B
IRQ2
6
H'000C to H'000D
IRQ3
7
H'000E to H'000F
IRQ4
8
H'0010 to H'0011
IRQ5
9
H'0012 to H'0013
IRQ6
10
H'0014 to H'0015
IRQ7
11
H'0016 to H'0017
16-bit free-running
timer 0
ICIA0
(interrupt capture A)
12
H'0018 to H'0019
ICIB0
(interrupt capture B)
13
H'001A to H'001B
ICIC0
(interrupt capture C)
14
H'001C to H'001D
ICID0
(interrupt capture D)
15
H'001E to H'001F
16
H'0020 to H'0021
OCIA0 (output compare A)
16-bit free-running
timer 1
8-bit timer 0
8-bit timer 1
Serial communication interface 0
OCIB0 (output compare B)
17
H'0022 to H'0023
FOVI0
(overflow)
18
H'0024 to H'0025
ICI1
(input capture)
19
H'0026 to H'0027
OCIA1 (output compare A)
20
H'0028 to H'0029
OCIB1 (output compare B)
21
H'002A to H'002B
FOVI1
22
H'002C to H'002D
(overflow)
CMI0A (compare match A)
23
H'002E to H'002F
CMI0B (compare match B)
24
H'0030 to H'0031
OVI0
(overflow)
25
H'0032 to H'0033
CMI1A (compare match A)
26
H'0034 to H'0035
CMI1B (compare match B)
27
H'0036 to H'0037
OVI1
28
H'0038 to H'0039
(overflow)
ERI0
(receive error)
29
H'003A to H'003B
RXI0
(receive end)
30
H'003C to H'003D
TXI0
(TDR empty)
31
H'003E to H'003F
TEI0
(TSR empty)
32
H'0040 to H'0041
Low
67
Table 4.2
Interrupts (cont)
Interrupt Source
Serial communication interface 1
ERI1
(receive error)
Vector No.
Vector Address
Priority
33
H'0042 to H'0043
High
RXI1
(receive end)
34
H'0044 to H'0045
TXI1
(TDR empty)
35
H'0046 to H'0047
TEI1
(TSR empty)
36
H'0048 to H'0049
A/D converter
ADI
(conversion end)
37
H'004A to H'004B
Data transfer
unit
MWEI
(write end)
38
H'004C to H'004D
MREI
(read end)
39
H'004E to H'004F
DTIA
(transfer end A)
40
H'0050 to H'0051
DTIB
(transfer end B)
41
H'0052 to H'0053
DTIC
(transfer end C)
42
H'0054 to H'0055
CMPI
(overrun error)
43
H'0056 to H'0057
OVF
(watchdog overflow)
44
H'0058 to H'0059
Watchdog timer
Low
Notes: 1. Reset vectors are located at H'0000 and H'0001.
2. H'0002 to H'0005 is a reserved area unavailable to the user.
4.3.2
Interrupt-Related Registers
The interrupt-related registers are the system control register (SYSCR), IRQ sense control register
(ISCR), and IRQ enable register (IER).
Table 4.3
Registers Read by Interrupt Controller
Name
Abbreviation
Read/Write
Address
System control register
SYSCR
R/W
H'FFC4
IRQ sense control register
ISCR
R/W
H'FFC6
IRQ enable register
IER
R/W
H'FFC7
68
System Control Register (SYSCR)
Bit
7
6
5
4
3
2
1
0
SSBY
STS2
STS1
STS0
XRST
NMIEG
DPME
RAME
Initial value
0
0
0
0
1
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
The valid edge on the NMI line is controlled by bit 2 (NMIEG) in the system control register.
Bit 2—NMI Edge (NMIEG): Determines whether a nonmaskable interrupt is generated on the
falling or rising edge of the NMI input signal.
Bit 2
NMIEG
Description
0
An interrupt is generated on the falling edge of NMI
1
An interrupt is generated on the rising edge of NMI
(Initial state)
See section 3.2, System Control Register, for information on the other SYSCR bits.
IRQ Sense Control Register (ISCR)
Bit
7
6
5
4
3
2
1
0
IRQ7SC IRQ6SC IRQ5SC IRQ4SC IRQ3SC IRQ2SC IRQ1SC IRQ0SC
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits 7 to 0—IRQ7 to IRQ0 Sense Control (IRQ7SC to IRQ0SC): These bits determine whether
IRQ7 to IRQ0 are level-sensed or sensed on the falling edge.
Bits 7 to 0
IRQ7SC to IRQ0SC
Description
0
An interrupt is generated when IRQ7 to IRQ0 inputs are low
1
An interrupt is generated by the falling edge of the IRQ7 to IRQ0 inputs
(Initial state)
69
IRQ Enable Register (IER)
Bit
7
6
5
4
3
2
1
0
IRQ7E
IRQ6E
IRQ5E
IRQ4E
IRQ3E
IRQ2E
IRQ1E
IRQ0E
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits 7 to 0—IRQ7 to IRQ0 Enable (IRQ7E to IRQ0E): These bits enable or disable the IRQ7
to IRQ0 interrupts individually.
Bits 7 to 0
IRQ7E to IRQ0E
Description
0
IRQ7 to IRQ 0 interrupt requests are disabled
1
IRQ7 to IRQ 0 interrupt requests are enabled
(Initial state)
When edge sensing is selected (by setting bits IRQ7SC to IRQ0SC to 1), it is possible for an
interrupt-handling routine to be executed even though the corresponding enable bit (IRQ7E to
IRQ0E) is cleared to 0 and the interrupt is disabled. If an interrupt is requested while the enable bit
(IRQ7E to IRQ0E) is set to 1, the request will be held pending until served. If the enable bit is
cleared to 0 while the request is still pending, the request will remain pending, although new
requests will not be recognized. If the interrupt mask bit (I) in the CCR is cleared to 0, the
interrupt-handling routine can be executed even though the enable bit is now 0.
If execution of interrupt-handling routines under these conditions is not desired, it can be avoided
by using the following procedure to disable and clear interrupt requests.
1. Set the I bit to 1 in the CCR, masking interrupts. Note that the I bit is set to 1 automatically
when execution jumps to an interrupt vector.
2. Clear the desired bits from IRQ7E to IRQ0E to 0 to disable new interrupt requests.
3. Clear the corresponding IRQ7SC to IRQ0SC bits to 0, then set them to 1 again. Pending IRQn
interrupt requests are cleared when I = 1 in the CCR, IRQnSC = 0, and IRQnE = 0.
70
4.3.3
External Interrupts
The nine external interrupts are NMI and IRQ0 to IRQ7. NMI, IRQ 0 to IRQ2, and IRQ6 can be used
to recover from software standby mode.
NMI: A nonmaskable interrupt is generated on the rising or falling edge of the NMI input signal
regardless of whether the I (interrupt mask) bit is set in the CCR. The valid edge is selected by the
NMIEG bit in the system control register. The NMI vector number is 3. In the NMI hardware
exception-handling sequence the I bit in the CCR is set to 1.
IRQ0 to IRQ7: These interrupt signals are level-sensed or sensed on the falling edge of the input,
as selected by ISCR bits IRQ0SC to IRQ7SC. These interrupts can be masked collectively by the I
bit in the CCR, and can be enabled and disabled individually by setting and clearing bits IRQ0E to
IRQ7E in the IRQ enable register.
When one of these interrupts is accepted, the I bit is set to 1. IRQ0 to IRQ7 have interrupt vector
numbers 4 to 11. They are prioritized in order from IRQ 7 (low) to IRQ0 (high). For details, see
table 4.2.
Interrupts IRQ 0 to IRQ7 do not depend on whether pins IRQ0 to IRQ7 are input or output pins.
When using external interrupts IRQ0 to IRQ7, clear the corresponding DDR bits to 0 to set these
pins to the input state, and do not use these pins as input or output pins for the timers, serial
communication interface, or A/D converter.
4.3.4
Internal Interrupts
Thirty-three internal interrupts can be requested by the on-chip supporting modules. Each interrupt
source has its own vector number, so the interrupt-handling routine does not have to determine
which interrupt has occurred. All internal interrupts are masked when the I bit in the CCR is set to
1. When one of these interrupts is accepted, the I bit is set to 1 to mask further interrupts (except
NMI). The vector numbers are 12 to 44. For the priority order, see table 4.2.
71
4.3.5
Interrupt Handling
Interrupts are controlled by an interrupt controller that arbitrates between simultaneous interrupt
requests, commands the CPU to start the hardware interrupt exception-handling sequence, and
furnishes the necessary vector number. Figure 4.3 shows a block diagram of the interrupt
controller.
Interrupt
controller
NMI interrupt
IRQ0 flag
IRQ0E
CPU
*
Interrupt request
IRQ0
interrupt
Priority
decision
Vector number
ADF
ADIE
ADI
interrupt
I (CCR)
Note: * For edge-sensed interrupts, these AND gates change to the circuit shown below.
IRQ0 edge
IRQ0E
IRQ0 flag
S
Q
IRQ0 interrupt
Figure 4.3 Block Diagram of Interrupt Controller
The IRQ interrupts and interrupts from the on-chip supporting modules all have corresponding
enable bits (except for the watchdog timer reset option). When the enable bit is cleared to 0, the
interrupt signal is not sent to the interrupt controller, so the interrupt is ignored. These interrupts
can also all be masked by setting the CPU’s interrupt mask bit (I) to 1. Accordingly, these
interrupts are accepted only when their enable bit is set to 1 and the I bit is cleared to 0.
72
The nonmaskable interrupt (NMI) is always accepted, except in the reset state and hardware
standby mode.
When an NMI or another enabled interrupt is requested, the interrupt controller transfers the
interrupt request to the CPU and indicates the corresponding vector number. (When two or more
interrupts are requested, the interrupt controller selects the vector number of the interrupt with the
highest priority.) When notified of an interrupt request, at the end of the current instruction or
current hardware exception-handling sequence, the CPU starts the hardware exception-handling
sequence for the interrupt and latches the vector number.
Figure 4.4 is a flowchart of the interrupt (and reset) operations. Figure 4.6 shows the interrupt
timing sequence for the case in which the software interrupt-handling routine is in on-chip ROM
and the stack is in on-chip RAM.
1. An interrupt request is sent to the interrupt controller when an NMI interrupt occurs, and when
an interrupt occurs on an IRQ input line or in an on-chip supporting module provided the
enable bit of that interrupt is set to 1.
2. The interrupt controller checks the I bit in the CCR and accepts the interrupt request if the I bit
is cleared to 0. If the I bit is set to 1 only NMI requests are accepted; other interrupt requests
remain pending.
3. Among all accepted interrupt requests, the interrupt controller selects the request with the
highest priority and passes it to the CPU. Other interrupt requests remain pending.
4. When it receives the interrupt request, the CPU waits until completion of the current
instruction or hardware exception-handling sequence, then starts the hardware exceptionhandling sequence for the interrupt and latches the interrupt vector number.
5. In the hardware exception-handling sequence, the CPU first pushes the PC and CCR onto the
stack. See figure 4.5. The stacked PC indicates the address of the first instruction that will be
executed on return from the software interrupt-handling routine.
6. Next the I bit in the CCR is set to 1, masking all further interrupts except NMI.
7. The vector address corresponding to the vector number is generated, the vector table entry at
this vector address is loaded into the program counter, and execution branches to the software
interrupt-handling routine at the address indicated by that entry.
73
Program execution
Interrupt
requested?
No
Yes
Yes
NMI?
No
I = 0?
No
Pending
Yes
IRQ0?
No
No
Yes
IRQ1?
Yes
OVF?
Yes
Latch vector no.
Save PC
Save CCR
Reset
I←1
Read vector address
Branch to software
interrupt-handling
routine
Figure 4.4 Hardware Interrupt-Handling Sequence
74
SP – 4
SP(R7)
CCR
SP – 3
SP + 1
CCR*
SP – 2
SP + 2
PC (upper byte)
SP – 1
SP + 3
PC (lower byte)
SP (R7)
Stack area
Before interrupt
is accepted
SP + 4
Pushed onto stack
Even address
After interrupt
is accepted
PC: Program counter
CCR: Condition code register
SP: Stack pointer
Notes: 1. The PC contains the address of the first instruction executed after return.
2. Registers must be saved and restored by word access at an even address.
* Ignored on return.
Figure 4.5 Usage of Stack in Interrupt Handling
Although the CCR consists of only one byte, it is treated as word data when pushed on the stack.
In the hardware interrupt exception-handling sequence, two identical CCR bytes are pushed onto
the stack to make a complete word. When popped from the stack by an RTE instruction, the CCR
is loaded from the byte stored at the even address. The byte stored at the odd address is ignored.
75
Interrupt
accepted
Interrupt priority
decision. Wait for Instruction Internal
end of instruction. prefetch
processing
Vector
fetch
Stack
Instruction prefetch
(first instruction of
Internal interrupt-handling
process- routine)
ing
Interrupt request
signal
ø
Internal address
bus
(1)
(3)
(5)
(8)
(6)
(9)
Internal read
signal
Internal write
signal
Internal 16-bit
data bus
(2)
(4)
(1)
(7)
(9)
(1)
(10)
Instruction prefetch address (Pushed on stack. Instruction is executed on return from interrupt-handling
routine.)
(2) (4) Instruction code (Not executed)
(3)
Instruction prefetch address (Not executed)
(5)
SP–2
(6)
SP–4
(7)
CCR
(8)
Address of vector table entry
(9)
Vector table entry (address of first instruction of interrupt-handling routine)
(10)
First instruction of interrupt-handling routine
Figure 4.6 Timing of Interrupt Sequence
76
4.3.6
Interrupt Response Time
Table 4.4 indicates the number of states that elapse from an interrupt request signal until the first
instruction of the software interrupt-handling routine is executed. Since on-chip memory is
accessed 16 bits at a time, very fast interrupt service can be obtained by placing interrupt-handling
routines in on-chip ROM and the stack in on-chip RAM.
Table 4.4
Number of States before Interrupt Service
Number of States
No.
Reason for Wait
On-Chip Memory
3
External Memory
2* 3
1
Interrupt priority decision
2*
2
Wait for completion of
current instruction* 1
1 to 13
5 to 17* 2
3
Save PC and CCR
4
12* 2
4
Fetch vector
2
6* 2
5
Fetch instruction
4
12* 2
6
Internal processing
4
4
Total
17 to 29
41 to 53* 2
Notes: 1. These values do not apply if the current instruction is EEPMOV.
2. If wait states are inserted in external memory access, add the number of wait states.
3. 1 for internal interrupts.
77
4.3.7
Precaution
Note that the following type of contention can occur in interrupt handling.
When software clears the enable bit of an interrupt to 0 to disable the interrupt, the interrupt
becomes disabled after execution of the clearing instruction. If an enable bit is cleared by a BCLR
or MOV instruction, for example, and the interrupt is requested during execution of that
instruction, at the instant when the instruction ends the interrupt is still enabled, so after execution
of the instruction, the hardware exception-handling sequence is executed for the interrupt. If a
higher-priority interrupt is requested at the same time, however, the hardware exception-handling
sequence is executed for the higher-priority interrupt and the interrupt that was disabled is ignored.
Similar considerations apply when an interrupt request flag is cleared to 0.
Figure 4.7 shows an example in which the OCIAE bit is cleared to 0.
CPU write
cycle to TIER
OCIA interrupt handling
ø
Internal address bus
TIER address
Internal write signal
OCIAE
OCFA
OCIA interrupt signal
Figure 4.7 Contention between Interrupt and Disabling Instruction
The above contention does not occur if the enable bit or flag is cleared to 0 while the interrupt
mask bit (I) is set to 1.
78
4.4
Note on Stack Handling
In word access, the least significant bit of the address is always assumed to be 0. The stack is
always accessed by word access. Care should be taken to keep an even value in the stack pointer
(general register R7). Use the PUSH and POP (or MOV.W Rn, @–SP and MOV.W @SP+, Rn)
instructions to push and pop registers on the stack.
Setting the stack pointer to an odd value can cause programs to crash. Figure 4.8 shows an
example of damage caused when the stack pointer contains an odd address.
PCH
SP
PCL
SP
R1L
H'FECC
PCL
H'FECD
H'FECF
SP
BSR instruction
H'FECF set in SP
PCH:
PCL:
R1L:
SP:
MOV.B R1L, @–R7
PC is improperly stored
beyond top of stack
PCH is lost
Upper byte of program counter
Lower byte of program counter
General register
Stack pointer
Figure 4.8 Example of Damage Caused by Setting an Odd Address in R7
79
Section 5 Data Transfer Unit
5.1
Overview
The H8/3318 Series has an on-chip data transfer unit (DTU) with four direct memory access
(DMA) channels, and an on-chip 8-bit parallel buffer interface (PBI). When combined, these two
functions enable up to 256 bytes of on-chip RAM to be easily accessed (read or write) from
outside the chip.
In I/O transfer, the DTU can perform data transfer automatically between on-chip RAM and
registers of the serial communication interface (SCI), 16-bit free-running timer (FRT),
programmable timing pattern controller (TPC), and A/D converter (ADC), in response to an
interrupt request.
In PBI transfer, the DTU can implement a large dual-port RAM (DPRAM) by enabling up to 256
bytes of on-chip RAM to be accessed from an external master CPU. In its DPRAM mode, the PBI
has a buffer that can be queried to read one byte from a specified address. While accepting buffer
queries, the PBI can also operate in bound buffer mode, which provides sequential read/write
access starting from a specified address, or direct word mode, which does not use the DTU and
on-chip RAM.
The PBI can operate in handshake mode as well as DPRAM mode.
5.1.1
Features
Features of I/O transfer, DPRAM mode, and handshake mode are listed below.
I/O Transfer (Figure 5.1)
• The three DTU channels with I/O transfer capability (channels A, B, and C) can perform DMA
independently.
• The selectable types of transfer are: RAM to SCI (TDR), SCI (RDR) to RAM; RAM to FRT
(OCRA, OCRB); RAM to TPC (NDR); and ADC (ADDRA) to RAM.
• The number of bytes transferred can be controlled by setting a starting address and boundary.
Each channel can generate an independent interrupt when the designated number of bytes have
been transferred.
• A maximum 256-byte RAM area can be used (maximum 128 bytes per channel).
• Data in a specified area can be transferred repeatedly by designating repeat mode.
• Channel B can be set to operate in ring buffer mode (FIFO mode).
81
Supporting module
Halted
DTU
Interrupt
I/O register
CPU
Temporary
data register*
RAM
Note: * Different from DPDRR and DPDRW
Figure 5.1 Concept of I/O Transfer
DPRAM Mode
• A master CPU can access on-chip RAM randomly via a buffer, by using DTU channel R as
read DMA (buffer query).
• The master CPU can access on-chip RAM sequentially via a pair of buffers, using DTU
channel A for read DMA and channel B for write DMA (bound buffer mode). Without using
the DTU, the master CPU can also access the buffers in each channel as a dual-port RAM
(direct word mode).
• A maximum 256-byte RAM area can be used (maximum 128 bytes each in channel A and B).
• Internal CPU interrupts can be generated when the designated number of bytes have been
transferred (master read end, master write end).
• In single-chip mode, master CPU interrupt requests can be issued from the RDY pin, and wait
requests from the WRQ pin.
In the expanded modes, one of these two types of requests can be generated: master CPU
interrupt requests can be issued from the RDY pin, or wait requests can be issued from the
WRQ pin.
Buffer query operation (Figure 5.2)
• A 1-byte address/data register is available. By writing an on-chip RAM address, the master
CPU can read any byte in a 256-byte on-chip RAM area.
82
RS0 to RS2
RAM
DTU
DPRAM data register
(query read)
Slave CPU
Halted
DDB0 to DDB7
WE
OE
CS
WRQ
Figure 5.2 Concept of Buffer Queries
Bound buffer mode (Figure 5.3)
• Two pairs of 8-bit data registers are available, one for read and one for write. The master CPU
can use these as buffers to transfer data to or from a 256-byte on-chip RAM area with no wait
time.
• The number of bytes to be transferred can be designated by setting a starting address and
boundary. Each channel can generate an internal CPU interrupt when the designated number of
bytes have been transferred.
• In a read operation by the master CPU, data is transferred from addresses specified by the
internal CPU.
• In a write operation by the master CPU, data is transferred to addresses specified by the master
CPU.
DTU
DPRAM data register
(write)
RAM
CS
WE
OE
RS0 to RS2
CPU
Halted
DPRAM data register
(read)
DDB0 to DDB7
RDY
WRQ
Figure 5.3 Concept of Bound Buffer Mode
83
Direct word mode (Figure 5.4)
• Two pairs of 8-bit data registers are available, one for read and one for write. These can be
used as a dual-port RAM to exchange data with the master CPU. Channels not using bound
buffer mode are automatically placed in direct word mode.
DTU
DPRAM data register
(write)
RS0 to RS2
DDB0 to DDB7
Slave CPU
DPRAM data register
(read)
WE
OE
CS
RDY
Figure 5.4 Concept of Direct Word Mode
Handshake Mode (Figure 5.5)
• Handshaking is carried out using OE and WE input signals and RDY and WRQ output signals.
• An internal CPU interrupt can be generated at the rise of the OE input (output data processing
completed) and rise of the WE input (input data valid).
• The RDY and WRQ output signals can be used to send interrupt requests and data input/output
requests to the master CPU.
DTU
For reception
DPRAM data register
(write)
Slave CPU
For transmission
DPRAM data register
(read)
Figure 5.5 Concept of Handshake Mode
84
WE
WRQ
DDB0 to DDB7
OE
RDY
5.1.2
Block Diagram
Figure 5.6 shows a block diagram of the DTU and PBI.
Internal address bus
Bus request
Internal data bus interface
I/O control register (IOCR)
Data transfer address register H (DTARH)
Module data bus
Internal data bus
Reload address register C (RLARC)
Data transfer address register C (DTARC)
DTU control
circuit
Reload address register B (RLARB)
Data transfer address register B (DTARB)
Comparator
Compare address register B (CPARB)
Data transfer control register B (DTCRB)
Module master data bus
Internal address bus interface,
incrementer, and boundary decoder
Data transfer control register C (DTCRC)
Reload address register A (RLARA)
Data transfer address register A (DTARA)
Data transfer control register A (DTCRA)
DPRAM data register read query (DPDRRQ)
DPRAM data register write H (DPDRWH)
DPRAM data register write L (DPDRWL)
TXI
RXI
OCIA
ADI
OCIB
DPRAM data register read H (DPDRRH)
DPRAM data register read L (DPDRRL)
Parallel communication control/status
register (PCCSR)
PBI control circuit
DDB7 to
DDB0
RS2 to RS0
CS
OE
WE
RDY
WRQ
DPRAM data bus interface
Figure 5.6 DTU and PBI Block Diagram
85
5.1.3
Input and Output Pins
Table 5.1 lists the input and output pins.
CS, OE, WE, RDY, and DDB are active only in single-chip mode. In expanded mode, XCS, XOE,
XWE, XRDY, XDDB become active instead.
Table 5.1
Input and Output Pins
Name
Abbreviation* 1
I/O
Function (DPRAM Mode)
Chip select
CS, XCS
Input
Selects the PBI
Register select
RS 2 to RS0
Input
Used by the master CPU to select a PBI
register* 2
Output enable
OE, XOE
Input
Used by the master CPU to read a PBI register
Write enable
WE, XWE
Input
Used by the master CPU to write to a PBI
register
Ready
RDY, XRDY
Output
Sends an interrupt request to the master CPU
Wait request
WRQ
Output
Sends a wait request to the master CPU
DPRAM data
bus
DDB7 to DDB 0
Input/
output
8-bit data bus providing a parallel interface
between the master CPU and PBI
XDDB7 to XDDB 0
Notes: 1. Unless specifically noted, XCS, XOE, XWE, XRDY, and XDDB will be referred to as
CS, OE, WE, RDY, and DDB, respectively.
2. The registers selected by the register select signals are listed in table 5.2.
86
5.1.4
Register Configuration
Table 5.2 lists the DTU and PBI registers
Table 5.2
DTU and PBI Registers
Address
Abbreviation
R/W
Initial Value
Internal
RS 2 to
RS 0
Description
Parallel communication
control/status register
(PCCSR)
PCCSR
R/W
H'04
H'FFF0
000
P95
I/O control register
IOCR
R/W
H'03
H'FFF1
—
P84
DPRAM data register read query
DPDRRQ
—
Undetermined
—
001
P95
Data transfer address register H
DTARH
R/W
Undetermined
H'FFF5
—
P89
Data transfer control register A
DTCRA
*
H'00
H'FFF6
010
P86
Data transfer address register A
DTARA
*
Undetermined
H'FFF7
011
P89
Reload address register A
RLARA
R
Undetermined
H'FFF2
—
P90
Data transfer control register B
DTCRB
*
H'00
H'FFF8
010
P86
Data transfer address register B
DTARB
*
Undetermined
H'FFF9
011
P89
Reload address register B
RLARB
R
Undetermined
H'FFF3
—
P90
Compare address register B
CPARB
R/W
Undetermined
H'FFF4
—
P90
Data transfer control register C
DTCRC
R/W
H'00
H'FFFA
—
P86
Data transfer address register C
DTARC
R/W
Undetermined
H'FFFB
—
P89
Reload address register C
RLARC
—
Undetermined
—
—
P90
DPRAM data register write H
DPDRWH
*
Undetermined
H'FFFC
100
P93
DPRAM data register write L
DPDRWL
*
Undetermined
H'FFFD
101
P93
DPRAM data register read H
DPDRRH
*
Undetermined
H'FFFE
110
P94
DPRAM data register read L
DPDRRL
*
Undetermined
H'FFFF
111
P94
Serial/timer control register
STCR
R/W
H'1C
H'FFC3
—
P91
System control register
SYSCR
R/W
H'09
H'FFC4
—
P99
Name
Note: * Register read/write specifications are given in table 5.3, Transfer Modes and Register
Configuration.
Register accessibility differs depending on the transfer mode. Table 5.3 lists the register access
conditions for each transfer mode, and table 5.4 shows how each transfer mode is selected.
87
Table 5.3
Transfer Modes and Register Configuration
R/W
DPRAM Mode
PBI Transfer
Buffer
Query* 1
Internal
CPU
Master
CPU
Master
CPU
Internal
CPU
Master
CPU
Internal
CPU
Internal Initial
CPU
Value
RS 2 to
Internal RS 0
PCCSR
×
R/W
R/W
R/W
R/W
R/W
R/W
H'04
H'FFF0
000
IOCR
R/W
—
—
R/W
—
R/W
R/W
H'03
H'FFF1
—
DPDRRQ
—
R/W
×
—
×
—
—
*
—
001
DTARH
R/W
—
—
R/W
—
×
×
*
H'FFF5
—
DTCRA
R/W | × *
DTARA
R/W | × * 3
Chan- Abbrenel
viation
R
A
B
C
3
Bound Buffer
Mode
Address
—
— | R*
—
×
×
H'00
H'FFF6
010
—
— | R* 4
× | R/W*5
—
×
×
*
H'FFF7
011
—
4
× | R/W*
Direct Word
Mode
Handshake
Mode* 2
I/O
Transfer
5
RLARA
R|∆
—
—
∆ | R*
∆
∆
*
H'FFF2
—
DTCRB
R/W | × * 3
— | × *4
— | W*4
× | R* 5
— | × *4 ×
×
H'00
H'FFF8
010
DTARB
R/W | × * 3
— | × *4
— | W*4
× | R* 5
— | × *4 ×
×
*
H'FFF9
011
RLARB
R|∆
—
—
∆ | R*
—
∆
∆
*
H'FFF3
—
CPARB
R/W | × * 3
—
—
× | R/W*5
—
×
×
*
H'FFF4
—
DTCRC
R/W
—
—
×
—
×
×
H'00
H'FFFA
—
DTARC
R/W
—
—
×
—
×
×
*
H'FFFB
—
RLARC
—
—
—
—
—
—
*
—
—
DPDRWH ×
×
W
—
W
R
∆
*
H'FFFC 100
DPDRWL
×
×
W
—
W
R
R
*
H'FFFD 101
DPDRRH
×
×
R
R
W
∆
*
H'FFFE
110
DPDRRL
×
×
R
R
W
W
*
H'FFFF
111
5
5
Legend
×:
Must not be accessed (write access will affect operations of other functions).
∆:
Can be accessed, but has no effect on operation.
—:
Cannot be accessed.
*:
Undetermined
Notes: 1. Buffer queries can be made in parallel with bound buffer mode and direct word mode.
DTARH and IOCR are used in all these modes, so care is required in modifying their
contents.
2. In handshake mode, the master CPU can write to DPDRWL. The internal CPU can
output the DPDRRL contents to the master CPU.
3. Must not be accessed if used in bound buffer mode.
4. Cannot be accessed if used for I/O transfer.
5. Must not be accessed if used for I/O transfer.
88
Table 5.4
Transfer Mode Selection
I/O transfer mode
Basically, I/O transfer mode can be started for channels A, B, and C
at any time by setting DTE to 1.
However, channels A and B may be assigned for transfer in bound
buffer mode, depending on the IOCR setting. (See table 5.5 and
section 5.3.3.)
DPRAM mode
Buffer queries
Channel R is used exclusively. The buffer query function operates
when DPME = 1 in SYSCR and HSCE = 0 in IOCR. (See table 5.5
and section 5.3.4.)
Bound buffer mode
Channel A is used for reads to the master. This mode can be used
when DPME = 1 (SYSCR), HSCE = 0 (IOCR), and DPEA = 1 (IOCR).
Channel B is used for writes from the master. This mode can be used
when DPME = 1 (SYSCR), HSCE = 0 (IOCR), and DPEB = 1 (IOCR).
(See table 5.5 and section 5.3.5.)
Direct word mode
Channel A is used for reads to the master. This mode can be used
when DPME = 1 (SYSCR), HSCE = 0 (IOCR), and DPEA = 0 (IOCR).
Channel B is used for writes from the master. This mode can be used
when DPME = 1 (SYSCR), HSCE = 0 (IOCR), and DPEB = 0 (IOCR).
(See table 5.5 and section 5.3.6.)
Handshake mode
5.2
This mode can be used when DPME = 1 in SYSCR and HSCE = 1 in
IOCR. (See table 5.5 and section 5.3.7.)
Register Descriptions
The registers of the DTU and PBI are described below.
Abbreviations shown in boxes after the register name indicate the modes in which the register can
be used. The meaning of these abbreviations is as follows:
I/O:
Q:
BB:
DI:
H/S:
I/O transfer
Buffer queries
Bound buffer mode
Direct word mode
Handshake mode
89
5.2.1
I/O Control Register (IOCR)
Bit
I/O
Q
BB
DI
H/S
7
6
5
4
3
2
1
0
HSCE
DPEA
DPEB
RPEA
RPEB
RPEC
—
—
Initial value
0
0
0
0
0
0
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
—
—
IOCR selects DTU and PBI operating modes, and controls the DTU.
Bit 7—Parallel Handshake Enable (HSCE)
Bits 6 and 5—DPRAM Enable A and B (DPEA, DPEB)
The DTU and PBI operating modes are selected by the DPME bit in SYSCR, and the HSCE,
DPEA, and DPEB bits in IOCR. Table 5.5 lists the mode selections. Table 5.6 lists the
corresponding pin functions.
Table 5.5
DTU/PBI Operating Mode Settings
Buffer
Query
Hand- (DTU
DPME
Bit 7
Bit 6
Bit 5
shake Channel
(SYSCR) HSCE DPEA DPEB Mode R)
1
0
O:
×:
—:
*:
Bound
Buffer
Mode (DTU
Channel
A)
Bound
Buffer
Mode (DTU
Channel
B)
Direct
Word
Mode
(DPDRRH/L)
Direct
Word
Mode
(DPDRWH/L)
1
—
—
O
×
I/O transfer* I/O transfer* Handshake
Handshake
0
0
0
×
O (read)
I/O transfer* I/O transfer* O (read)
O (write)
1
0
×
O (read)
O (read)
0
1
×
O (read)
I/O transfer* O (write)
O (read)
1
1
×
O (read)
O (read)
Bound buffer Bound buffer
—
—
×
×
I/O transfer* I/O transfer* ×
—
I/O transfer* Bound buffer O (write)
O (write)
Bound buffer
×
Can be used
Cannot be used
Undetermined
Used in I/O transfer mode
Note: For I/O transfer, set the DTE bit to 1 in DTCRA, DTCRB, or DTCRC.
Handshake mode operation is supported only in single-chip mode. Do not set bit HSCE to 1
in expanded modes.
90
Table 5.6
Pin Functions
(SYSCR)
Bit 7
HSCE
Mode
Name
CS/XCS,
RS2 to RS0
OE/XOE,
WE/XWE
RDY/
XRDY
1
1
Handshake
Port
Control
input
Control
output
DPME
function
mode
0
0
DPRAM
mode
Control
input
—
—
Port
function
WRQ
Control output
or port function,
depending on
DDB7 to DDB0/
XDDB 7 to XDDB0
Data input/output
EWRQ (PCCSR)
bit
Port
function
Port
function
Port function
Port function or
data bus
Note: “Port function” means that the port functions, supporting-module functions, and extended
functions multiplexed with the DPRAM pins are available.
Bits 4, 3, and 2—Repeat Enable A, B, and C (RPEA, RPEB, RPEC): These bits are valid only
in I/O transfers. They select repeat mode or normal mode for DTU channels A, B, and C.
In normal mode, the DTE bit in DTCRA, DTCRB, or DTCRC is cleared to 0 when the transfer
reaches the boundary.
In repeat mode, when the transfer reaches the boundary, the DTE bit in DTCRA, DTCRB, or
DTCRC is not cleared to 0, and the data in the area defined by DTARA, DTARB, or DTARC and
the boundary is transferred repeatedly. Channels A and B also have reload address registers, and
channel B can furthermore operate in ring buffer mode.
For usage of the boundary, normal mode, and repeat mode, see section 5.3, Operation.
Bits 4, 3, or 2
RPEA, B, C
Description
0
Transfer in normal mode
1
Transfer in repeat mode
(Initial value)
Bits 1 and 0—Reserved: These bits cannot be modified and are always read as 1.
91
5.2.2
Data Transfer Control Registers A, B, and C (DTCRA, DTCRB, DTCRC)
I/O
Bit
7
6
5
4
3
2
BB
1
0
DTE DTIE BUD2 BUD1 BUD0 SOS2 SOS1 SOS0
Mode
Register
I/O transfer
DTCRA
DTCRB
DTCRC
PBI transfer in
DTCRA
DPRAM bound
buffer mode
DTCRB
Internal CPU
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
(R/W) R/W
R/W
R/W (R/W) (R/W) (R/W)
Internal CPU
Read/Write
0
Master CPU
Read/Write
0
R
R
R
R
R
R
R
Internal CPU
Read/Write
0
0
R
R
R
0
0
0
Master CPU
Read/Write
—
—
W
W
W
—
—
—
—:
Not used. Cannot be modified.
0:
Always reads 0.
(R/W): Can be written, but has no effect on operation.
These registers are used in I/O transfers, and in PBI transfers in DPRAM bound buffer mode.
In I/O transfers, DTCRA, DTCRB, and DTCRC serve as control registers for DTU channels A, B,
and C, respectively.
In PBI transfers in DPRAM bound buffer mode, DTCRA controls read access by the master CPU,
and DTCRB controls write access by the master CPU.
Bit 7—Data Transfer Enable (DTE): Used in I/O transfers. Not used in PBI transfers.
When DTE is set to 1, the channel begins waiting for a transfer request. The DMA transfer is
activated by the interrupt request signal selected by the source select bits (SOS2, SOS1, SOS0).
If a boundary overflow or the internal CPU clears the DTE bit to 0, the transfer is suspended. If
the DTIE bit is set to 1, an interrupt is also requested. If the internal CPU sets the DTE bit to 1
again, the transfer resumes from the state in which it was suspended.
92
Bit 7
DTE
Description
0
Indicates that I/O transfer is halted
(Initial value)
[Clearing conditions]
1. 0 is written in DTE
2. The transfer terminates at the boundary in normal mode
1
Indicates that I/O transfer is in progress
[Setting condition]
Read DTCR while DTE = 0, then write 1 in DTE
Bit 6—Data Transfer Interrupt Enable (DTIE): Used in I/O transfers. Not used in PBI
transfers. This bit enables or disables the interrupt generated when the DTE bit is cleared to 0.
Bit 6
DTIE
Description
0
Disables the interrupt requested when the DTE bit is cleared to 0 (DTI)
1
Enables the interrupt requested when the DTE bit is cleared to 0 (DTI)
(Initial value)
Bits 5, 4, and 3—Boundary 2, 1, and 0 (BUD2, BUD1, BUD0): These bits set a carry-control
boundary in the data transfer address register (DTAR), which is the register that gives the lower
byte of an on-chip RAM address. DTAR is an 8-bit counter that increments each time one byte or
one word is transferred. The incrementing is held within the selected boundary. When a carry
occurs at the boundary, causing a DTAR overflow, the bits above the boundary retain their
existing values, while the bits below the boundary are reset to their initial value. The initial value
may be 0, or a value stored in a reload register, depending on the channel and operating mode.
93
BUD2 BUD1 BUD0
DTAR Overflow Timing
Maximum
Bytes
Transferred*
0
0
0
End of each byte transfer
1
0
0
1
Carry from bit 0 to bit 1
in DTAR
2
0
1
0
Carry from bit 1 to bit 2
in DTAR
4
0
1
1
Carry from bit 2 to bit 3
in DTAR
8
1
0
0
Carry from bit 3 to bit 4
in DTAR
16
1
0
1
Carry from bit 4 to bit 5
in DTAR
32
1
1
0
Carry from bit 5 to bit 6
in DTAR
64
1
1
1
Carry from bit 6 to bit 7
in DTAR
128
DTAR
7
6
5
4
3
2
1
0
Note: * Number of bytes transferred when bits below the boundary are initially cleared to 0.
Figure 5.7 Bit Settings and Boundary Positions
Bits 2, 1, and 0—Source Select 2, 1, and 0 (SOS2, SOS1, SOS0): Used in I/O transfers, but not
in PBI transfers. These bits select the interrupt source that activates an I/O transfer by the DTU.
When DTE is set to 1, the selected interrupt request signal is regarded as an I/O transfer request.
When DTE is 0, the selected interrupt request signal is sent to the interrupt controller.
Table 5.7 lists the I/O transfer activation sources and the transfers they request. Some transfers
clear the activation source while others do not. By using a combination of these types, it is
possible to perform two consecutive transfer operations with a single activation source. In this
case, the I/O transfers are performed in alphabetical channel order (channel A, then B, then C).
If channel A or channel B executes transfer operation number 9 or 10 in table 5.7, the activation
source is not cleared, and the channel is stopped.
A stopped channel is automatically cleared by the completion of transfer operation 5 or 7 for
stoppage due to transfer operation 9, or by completion of operation 4 or 6 for operation 10. A
stopped channel can also be cleared by a dummy write to its data transfer control register (DTCR).
94
Table 5.7
Selection of Activation Sources and Resulting Transfers
Clearing
DTU (Channel A)
of
Source SOS2 SOS1 SOS0
Interrupt
No. Source Module Transfer
DTU (Channel B)
DTU (Channel C)
SOS2 SOS1 SOS0
SOS2 SOS1 SOS0
1
RXI0
SCI0
RDR → RAM (byte)
Yes
0
0
1
0
0
1
0
0
1
2
TXI0
SCI0
RAM → TDR (byte)
Yes
0
1
0
0
1
0
0
1
0
3
ADI
ADC
ADDRA → RAM (word) Yes
0
1
1
0
1
1
0
1
1
4
OCIB1
TPC
RAM → NDRB (word) Yes
1
0
0
5
OCIA1
TPC
RAM → NDRB (word) Yes
6
OCIB1
TPC
RAM → NDRA (byte)
Yes
7
OCIA1
TPC
RAM → NDRA (byte)
Yes
8
OCIA1
FRT1
RAM → OCRA (word) Yes
1
0
9
OCIA1
FRT1
RAM → OCRA (word) No
1
10
OCIB1
FRT1
RAM → OCRB (word) No
1
1
0
0
1
0
1
0
1
1
0
0
1
1
1
1
1
0
1
0
1
1
1
0
1
1
1
Note: When SOS2 = SOS1 = SOS0 = 0, an activation source is not selected.
5.2.3
Data Transfer Address Register H (DTARH)
I/O
Q
BB
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
DTARH is used whenever the DTU function is used. It is used both for I/O transfers and for PBI
transfers in DPRAM mode, including buffer queries and transfers in bound buffer mode.
DTARH is the register that specifies the upper 8 bits of the on-chip RAM address. DTARH can be
paired with DTARA, DTARB, or DTARC to generate a 16-bit address.
95
5.2.4
Data Transfer Address Registers A, B, and C (DTARA, DTARB, DTARC)
I/O
Mode
Register
I/O transfer
DTARA
DTARB
DTARC
PBI transfer in
DTARA
DPRAM bound
buffer mode
DTARB
Internal CPU
Q
BB
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W (R/W) (R/W) (R/W)
Internal CPU
Read/Write
R/W
R/W
R/W
R/W
Master CPU
Read/Write
R
R
R
R
R
R
R
R
Internal CPU
Read/Write
R
R
R
R
R
R
R
R
Master CPU
Read/Write
W
W
W
W
W
W
W
W
The DTAR registers are used when the DTU function is used for I/O transfers, and for PBI
transfers in DPRAM bound buffer mode. DTARA, DTARB, and DTARC pair with DTARH to
generate 16-bit on-chip RAM addresses which indicate DTU transfer addresses. A boundary can
be set in the DTAR registers by the BUD bits, so that the DTAR registers increment only in the
range up to the boundary.
In an I/O transfer, these registers are used as the lower 8-bit address registers in each channel.
In a PBI transfer in DPRAM bound buffer mode, DTARA is the lower 8-bit address register in
read access by the master CPU, and DTARB is the lower 8-bit address register in write access by
the master CPU.
96
5.2.5
Reload Address Registers A, B, and C (RLARA, RLARB, RLARC)
I/O
BB
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The RLAR registers are used when the DTU function is used for I/O transfers, and for PBI
transfers in DPRAM bound buffer mode.
The RLAR registers store data for initializing the DTAR registers when a boundary overflow
occurs. Writes to the RLAR registers are performed automatically by master CPU or internal CPU
writes. The DTAR value is then successively incremented, and if a boundary overflow occurs, the
DTAR register will be initialized to the value in the RLAR register.
In ring buffer mode, RLARB functions as an auxiliary ring buffer pointer. DTARB is the main
pointer, indicating the DTU transfer address. If a series of transfers is suspended and the stored
data becomes invalid, DTARB can be initialized to the value in RLARB (loading). If a series of
transfers ends normally and the stored data is valid, the contents of DTARB can be copied to
RLARB (marking). Note, however, that in repeat mode the value in RLARB is copied to DTARB
automatically when a boundary overflow occurs.
5.2.6
Compare Address Register B (CPARB)
BB
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
CPARB is an auxiliary pointer used in ring buffer mode. The contents of CPARB are constantly
compared with DTARB. When they match, an interrupt request can be generated.
CPARB should be updated by software so that it always indicates the top of the unprocessed data
in the ring buffer. Then if the ring buffer becomes full of unprocessed data, causing an overrun
error, CPARB and DTARB will match and an interrupt request will occur.
97
5.2.7
Serial/Timer Control Register (STCR)
BB
Bit
7
6
5
4
3
2
1
0
RING
CMPF
CMPIE
LOAD
MARK
—
ICKS1
ICKS0
Initial value
0
0
0
1
1
1
0
0
Read/Write
R/W
R/(W)*
R/W
(W)
(W)
—
R/W
R/W
Note: * Software can write a 0 in bit 6 to clear the flag, but cannot write a 1 in this bit.
STCR is an 8-bit readable/writable register that controls DTU channel B, and selects the SCI
operating mode and the TCNT clock source. STCR is initialized to H'1C by a reset.
Bit 7—Ring Buffer Mode (RING): Setting this bit to 1 places DTU channel B in ring buffer
mode. To use ring buffer mode it is also necessary to set the REPB bit to 1 in IOCR.
Bit 7
RING
Description
0
DTU channel B does not operate in ring buffer mode
1
DTU channel B operates in ring buffer mode
(Initial value)
Bit 6—Compare Interrupt Flag (CMPF): Overrun error interrupt request flag for the ring
buffer. This flag indicates that the contents of CPARB and DTARB match after DTARB was
incremented due to the occurrence of a DTU cycle.
Bit 6
CMPF
Description
0
[Clearing condition]
Read STCR while CMPF = 1, then write 0 in CMPF
1
(Initial value)
Ring buffer overrun error
[Setting condition]
When DTARB contents match CPARB contents after being incremented by DTU
cycle occurrence
Bit 5—Compare Interrupt Enable (CMPIE): Enables or disables the interrupt (CMPI)
requested when CMPF is set to 1.
98
Bit 5
CMPIE
Description
0
Interrupt request (CMPI) by CMPF is disabled
1
Interrupt request (CMPI) by CMPF is enabled
(Initial value)
Bit 4—Pointer Load (LOAD): Controls the copying of the contents of the auxiliary pointer
(RLARB) into the ring buffer pointer (DTARB). There is no latch to retain the value of the LOAD
bit. The load operation is executed when the LOAD bit is cleared to 0.
Bit 4
LOAD
Description
Cleared to 0
RLARB contents are copied to DTARB
Set to 1
No operation
(Initial value)
Bit 3—Pointer Mark (MARK): Controls the copying of the contents of the ring buffer pointer
(DTARB) into the auxiliary pointer (RLARB). There is no latch to retain the value of the MARK
bit. The mark operation is executed when the MARK bit is cleared to 0.
Bit 3
MARK
Description
Cleared to 0
DTARB contents are copied to RLARB
Set to 1
No operation
(Initial value)
Bit 2—Reserved: This bit cannot be modified and is always read as 1.
Bits 1 and 0—Internal Clock Source Select 1 and 0 (ICKS1 and ICKS0): These bits, together
with bits CKS2 to CKS0 in TCR, select the TCNT clock source. For details see section 11, 8-Bit
Timers.
5.2.8
DPRAM Data Registers (DPDRWH, DPDRWL, DPDRRH, DPDRRL)
BB
DI
H/S
The DPRAM data registers (DPDR registers) provide four bytes, of which the master CPU can
write to two bytes (DPDRW) and read two bytes (DPDRR). These data registers are used in
DPRAM bound buffer mode, DPRAM direct word mode, and handshake mode. They are not used
for buffer queries in DPRAM mode, or for I/O transfers.
Read and write access to the DPDR registers sets interrupt flags (MWEF, MREF), activates the
DTU, and changes the levels of control signals (RDY, WRQ) sent to the master CPU. For details
of these operations, see section 5.3, Operation.
99
DPRAM Data Register Write H and L (DPDRWH, DPDRWL): These data registers are
reserved for write access by the master CPU in DPRAM bound buffer mode, DPRAM direct word
mode, and handshake mode. They are not used for buffer queries in DPRAM mode, or for I/O
transfers.
Mode
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Internal CPU
Read/Write
R*1
R*1
R*1
R*1
R*1
R*1
R*1
R*1
Master CPU
Read/Write
W
W
W
W
W
W
W
W
Internal CPU
Read/Write
R
R
R
R
R
R
R
R
Master CPU
Read/Write
W
W
W
W
W
W
W
W
DPDRWL* Internal CPU
Read/Write
R
Register
DRAM bound DPDRWH
buffr mode
DPDRWL
DRAM direct
word mode
Handshake
mode
DPDRWH
DPDRWL
3
Master CPU
Read/Write
R
W*
2
R
2
W*
R
W*
2
R
W*
2
R
W*
2
R
W*
2
R
2
W*
W*2
Notes: 1. Transferred to on-chip RAM automatically by the DTU.
2. Data on the DDB lines is latched at the rising edge of the WE input.
3. In handshake mode, the master CPU cannot access DPDRWH.
The two DPDRW bytes should be used in each mode as follows.
• DPRAM Bound Buffer Mode
DPDRWH and DPDRWL are reserved for write access by the master CPU. Data written in
these registers is transferred automatically to the on-chip RAM. The master CPU has two
addresses for these two bytes, but write access to both bytes operates in the same way.
• DPRAM Direct Word Mode
Read or write access to DPDRWL generates an interrupt request to the internal CPU or master
CPU. If both bytes are used, read or write access should be performed to DPDRWH first, then
DPDRWL. If only one byte is used, use DPDRWL.
• Handshake Mode
Use DPDRWL.
100
DPRAM Data Register Read H and L (DPDRRH, DPDRRL): These data registers are reserved
for read access by the master CPU in DPRAM bound buffer mode, DPRAM direct word mode,
and handshake mode. They are not used for buffer queries in DPRAM mode, or for I/O transfers.
Mode
Handshake
mode
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Internal CPU
Read/Write
W*1
W*1
W*1
W*1
W*1
W*1
W*1
W*1
Master CPU
Read/Write
R
R
R
R
R
R
R
R
Internal CPU
Read/Write
W
W
W
W
W
W
W
W
Master CPU
Read/Write
R
R
R
R
R
R
R
R
Internal CPU
Read/Write
W
W
W
W
W
W
W
W
Master CPU
Read/Write
R*2
R*2
R*2
R*2
R*2
R*2
R*2
R*2
Register
DRAM bound DPDRRH
buffr mode
DPDRRL
DRAM direct
word mode
Bit
DPDRRH
DPDRRL
DPDRRL*
3
Notes: 1. Transferred from on-chip RAM automatically by the DTU.
2. Data is output on the DDB lines when the OE input is low.
3. In handshake mode, the master CPU cannot access DPDRRH.
The two DPDRR bytes should be used in each mode as follows.
• DPRAM Bound Buffer Mode
DPDRRH and DPDRRL are reserved for read access by the master CPU. The read data is
transferred automatically from on-chip RAM. The master CPU has two addresses for these two
bytes, but read access to both bytes operates in the same way.
• DPRAM Direct Word Mode
Read or write access to DPDRRL generates an interrupt request to the internal CPU or master
CPU. If both bytes are used, DPDRRH should be accessed first, then DPDRRL. If only one
byte is used, use DPDRRL.
• Handshake Mode
Use DPDRRL.
101
5.2.9
DPRAM Data Register Read Query (DPDRRQ)
This register is used as a query buffer in DPRAM mode.
Q
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Internal CPU
Read/Write
W*
W*
W*
W*
W*
W*
W*
W*
Master CPU
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note: * Transferred automatically from on-chip RAM by the DTU.
DPDRRQ is reserved for read and write access by the master CPU. When a write access to
DPDRRQ occurs, data stored in on-chip RAM at the address given by DTARH (upper byte) and
DPDRRQ (lower byte) is transferred to DPDRRQ.
5.2.10
Parallel Communication Control/Status Register (PCCSR)
Q
BB
DI
H/S
This register is used in DPRAM mode and handshake mode. It is not used in I/O transfers.
PCCSR can be written and read by both the internal CPU and the master CPU. It controls data
transfer between the internal CPU and master CPU, and indicates status.
Bit
7
6
QREF EWRQ
5
4
EWAKAR ERAKAR
Initial value
0
0
0
0
3
2
1
MWEF MREF EMWI
0
0
0
EMRI
0
0
R/W
R/W
R
R
R/W
R/W
Mode
All modes
except
handshake
mode
Internal CPU
Read/Write
R
R
R
R
Master CPU
Read/Write
R
R/W
R/W
R/W
Handshake
mode
Internal CPU
Read/Write
R
R/W
R/W
R/W
Note: * Only 0 write after read is available.
102
R/(W)* R/(W)*
R
R
R/(W)* R/(W)*
Bit 7—Query Read End Flag (QREF): Indicates whether DPDRRQ contains an on-chip RAM
address or data. This flag is useful in buffer query operations in DPRAM mode.
Bit 7
QREF
Description
0
DPDRRQ contains data
(Initial value)
[Clearing condition]
The DTU writes on-chip RAM data in DPDRRQ
1
DPDRRQ contains the lower byte of an on-chip RAM address
[Setting condition]
The master CPU writes the lower byte of an on-chip RAM address in DPDRRQ
Bit 6—Enable Wait Request (EWRQ): Enables operation of the WRQ pin.
Bit 5—Enable Write Acknowledge and Request (EWAKAR): Enables operation of the RDY
pin in response to master write access.
Bit 4—Enable Read Acknowledge and Request (ERAKAR): Enables operation of the RDY pin
in response to master read access.
Table 5.8 lists the pin states in single-chip mode. Table 5.9 lists the pin states in the expanded
modes.
103
Table 5.8
Condition
DPME = 1,
HSCE = 0
DPME = 1,
HSCE = 1
Table 5.9
Condition
DPME = 1,
HSCE = 0
DPME = 1,
HSCE = 1
104
Pin States in Single-Chip Mode with PCCSR Conditions
Bit 6
EWRQ
Bit 5
EWAKAR
Bit 4
ERAKAR
*
0
*
P95/RDY
P83/WRQ/XRDY
0
High level output (high
impedance)
Depends on value
of EWRQ as below
1
0
RDY output enabled at
master write
*
0
1
RDY output enabled at
master read
*
1
1
RDY output enabled at
master write and master read
0
*
*
Port function
1
*
*
Depends on value of
ERAKAR and EWAKAR as
above
0
*
*
RDY output enabled
Port function
1
*
*
RDY output enabled
WRQ output
enabled
WRQ output
enabled
Pin States in Expanded Modes with PCCSR Conditions
Bit 6
EWRQ
Bit 5
EWAKAR
Bit 4
ERAKAR
P95/RDY
P83/WRQ/XRDY
0
0
0
AS output
High level output
0
1
0
AS output
XRDY output enabled at master
write
0
0
1
AS output
XRDY output enabled at master
read
0
1
1
AS output
XRDY output enabled at master
write and master read
1
*
*
AS output
WRQ output enabled
0
*
*
AS output
XRDY output enabled
1
*
*
AS output
WRQ output enabled
Table 5.10 describes RDY output operations. Table 5.11 describes WRQ operations.
Table 5.10 RDY Output Operations
Mode
Conditions for High Level
Output*
Conditions for Low Level
Output
DPRAM bound
buffer mode
Master read
Master CPU reads DTARA
Internal CPU clears MREF
Master write
Master CPU writes to DTARB
Internal CPU clears MWEF
DPRAM direct
word mode
Master read
Master CPU reads DPDRRL
Internal CPU writes to DPDRRL
Master write
Master CPU writes to DPDRWL Internal CPU reads DPDRWL
Handshake mode
Internal CPU reads DPDRWL
OE is high and WE is low
Note: * During single-chip mode, pin RDY becomes an NMOS open drain output pin. High level
output at this time refers to the high impedance state.
Table 5.11 WRQ Output Operations
Conditions for High Level
Output
Conditions for Low Level
Output
Master read
DTU completes transfer to
DPDRRH/L
Master CPU reads DPDRRH/L
before DTU transfers new data
Master write
DTU completes transfer from
DPDRWH/L
Master CPU writes to
DPDRWH/L before DTU
transfers old data
Buffer query in DPRAM mode
DTU completes transfer to
DPDRRQ
Master CPU reads DPDRRQ
before DTU transfers new data
Handshake mode
8 system clocks after OE and
WRQ both become low
Internal CPU writes to DPDRRL
Mode
DPRAM bound
buffer mode
105
Bit 3—Master Write End Flag (MWEF)
Bit 2—Master Read End Flag (MREF)
Table 5.12 describes the operation of MREF and MWEF. Table 5.13 explains the meaning of
MREF and MWEF.
Table 5.12 MREF and MWEF Operations
Mode
DPRAM bound
buffer mode
DPRAM direct
word mode
Handshake
mode
Clearing Condition
Setting Condition
MREF
Internal CPU reads MREF = 1,
then writes 0 in MREF
DTU channel A has completed
transfer up to boundary
MWEF
Internal CPU reads MWEF = 1,
then writes 0 in MWEF
DTU channel B has completed
transfer up to boundary
MREF
Internal CPU writes to or
dummy-reads DPDRRL
Master CPU reads DPDRRL
MWEF
Internal CPU reads or
dummy-writes to DPDRWL
Master CPU writes to DPDRWL
MREF
Internal CPU writes to or
dummy-reads DPDRRL
OE goes high
MWEF
Internal CPU reads or
dummy-writes to DPDRWL
WE goes high
Table 5.13 Meaning of MREF and MWEF
Mode
DPRAM bound
buffer and direct
word modes
Handshake
mode
106
0
1
MREF
Internal CPU has finished
preparing data to be read by
master CPU
Master CPU has finished
reading data prepared by
internal CPU
MWEF
Internal CPU has finished
processing data written by
master CPU
Master CPU has finished
writing data to be processed
by internal CPU
MREF
Internal CPU has prepared data
to be output to master CPU
Master CPU has read data
being output by internal CPU
MWEF
Internal CPU has read data
latched by master CPU
Master CPU has caused
internal CPU to latch data
Bit 1—Enable Master Write Interrupt (EMWI): Enables or disables the interrupt (MWEI)
requested by MWEF when MWEF is set to 1.
Bit 1
EMWI
Description
0
Disables interrupt request (MWEI) by MWEF
1
Enables interrupt request (MWEI) by MWEF
(Initial value)
Bit 0—Enable Master Read Interrupt (EMRI): Enables or disables the interrupt (MREI)
requested by MREF when MREF is set to 1.
Bit 0
EMRI
Description
0
Disables interrupt request (MREI) by MREF
1
Enables interrupt request (MREI) by MREF
5.2.11
(Initial value)
System Control Register (SYSCR)
Bit
7
6
5
4
3
2
1
0
SSBY
STS2
STS1
STS0
XRST
NMIEG
DPME
RAME
Initial value
0
0
0
0
1
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
Bit 1—DPRAM Enable Bit (DPME): Selects whether to put the chip into slave mode. When
using a transfer mode other than I/O transfer, the chip must be put into slave mode. See tables 5.5
and 5.6. DPME is initialized at reset and in hardware standby mode.
Bit 1
DPME
Description
0
The chip is not put into slave mode
1
The chip is put into slave mode
(Initial value)
For descriptions of other bits of SYSCR, refer to section 3.2, System Control Register.
107
5.3
Operation
5.3.1
DTU Operation
DTU Operation Overview: The DTU operates by sharing the CPU’s data bus, address bus, and
bus control signals. To carry out a transfer, the DTU gets the bus right and generates a DTU bus
cycle. During the DTU bus cycle, CPU bus cycles are held pending, while internal CPU operations
can proceed concurrently.
A DTU bus cycle is initiated by a DTU bus request. In case of contention between CPU and DTU
bus cycle requests, the DTU bus cycle has priority. A request for a DTU bus cycle can occur at the
end of a CPU bus cycle or DTU bus cycle. When the CPU is operating internally or in sleep mode,
a request can occur at any time.
A DTU bus cycle bus request is generated in response to a transfer request. The source of the
transfer request may be an interrupt request from an on-chip supporting module, or a low-to-high
transition at the OE or WE pin in the PBI. These transfer requests are recognized when the CPU is
active or in sleep mode, but are not recognized in the reset state or standby modes.
Types of DTU Bus Cycles: Table 5.14 classifies the bus cycles generated by the DTU and
indicates their transfer request sources.
A DPRAM cycle occurs when the DTU acquires the bus right for a PBI transfer request. There are
two types of DPRAM cycles: master read, and master write. DTU channels R and A can generate
master read cycles. DTU channel B can generate master write cycles.
Dead cycles, read cycles, and write cycles occur when the DTU acquires the bus right for an I/O
transfer request. I/O transfers can be carried out on three DTU channels: channels A, B, and C.
Each channel executes a series of DTU bus cycles consisting of a dead cycle, read cycle, and write
cycle.
108
Table 5.14 Types of DTU Bus Cycles
Type
Name
Operation
Request Source
PBI transfer
cycle
Master read
cycle
Read on-chip RAM and simultaneously
input data to PBI
PBI
Master write
cycle
Output data from PBI and simultaneously
write to on-chip RAM
PBI
Dead cycle
Confirmation of transfer request
Supporting module
Read cycle
Read on-chip RAM or register of on-chip
supporting module
DTU
Write cycle
Write to on-chip RAM or register of on-chip
supporting module
DTU
I/O transfer
cycle
DTU Bus Cycle Processing: Data is transferred from on-chip RAM to the PBI in a master read
cycle, or from the PBI to on-chip RAM in a master write cycle.
A dead cycle is a one-state waiting interval to be certain of a transfer request. During a DTU bus
cycle after the dead cycle, the transfer request cannot be cancelled by the CPU. During the dead
cycle, the flag of the free-running timer (FRT) or A/D converter, the source of the transfer request,
is cleared. Data is transferred from on-chip RAM or an on-chip supporting module to the DTU in a
read cycle, and from the DTU to on-chip RAM or an on-chip supporting module in a write cycle.
Interrupt flags in the SCI are cleared automatically when the receive data register is read or when
data is written in the transmit data register.
Canceling an I/O Transfer Request: I/O transfer requests are generated by interrupt flags in the
on-chip supporting modules. If the CPU clears the interrupt flag, the transfer request will be
cancelled. If the transfer request is cancelled during a dead cycle, the following read cycle and
write cycle will not be executed.
Priority of Transfer Requests and Bus Requests: Table 5.15 indicates the priority order of
transfer requests. A transfer request for a master read cycle caused by a buffer query in DPRAM
mode always has highest priority. Among transfer requests in DPRAM bound buffer mode, master
read has priority over master write.
I/O transfers are basically performed in alphabetical order of channels (A,B,C), but in some cases
a bus request will not be generated even though a transfer request is present. No bus request is
generated for a one-state interval (dead cycle) after a write cycle.
PBI transfers take priority over I/O transfers, so a PBI transfer may be inserted during the
execution of a series of I/O transfer cycles. If there is a PBI transfer request at the end of a read
cycle, the write cycle will be held pending until all PBI transfer processing is completed.
109
Table 5.15 Priority Order of DTU Transfer Requests
Priority of DTU Bus Cycle Activation
Master
Read
Cycle
(Ch. R)
Master
Read
Cycle
(Ch. A)
Master
Write
Cycle
(Ch. B)
Dead
Cycle
Read
Cycle
Write
Cycle
Pending
Write
Cycle
Other than
below
1
2
3
5
—
—
4
Dead cycle of
cancelled bus
request
1
2
3
4
—
—
—
Dead cycle
—
—
—
—
1
—
—
Read cycle
1
2
3
—
—
4*
—
Write cycle
1
2
3
—
—
—
—
Preceding
Operation
Notes: Master read cycle in channel R: buffer query in DPRAM mode
Master read cycle in channel A: DPRAM bound buffer mode
Dead cycle priority order: channel A, channel B, channel C
* Write cycle only in the channel that generated the preceding read cycle.
Held pending if a higher-priority PBI transfer cycle is executed.
Address Bus Operations: Figure 5.8 shows a conceptual diagram of the DTU address-bus
circuits. The DTARH contents, or H'FF, are output on the upper 8 bits of the 16-bit address bus.
The contents of DTARA, DTARB, DTARC, or DPDRRQ, or the address of a supporting-module
register determined by an I/O transfer request source, are output on the lower 8 bits.
110
H'FF
Incrementer
RLARA
Address bus, lower 8 bits
Upper
address
select
Address bus, upper 8 bits
DTARH
Internal bus
DTARA
RLARB
DTARB
Channel
select
Comparator
Lower
address
select
CPARB
DTARC
RLARC
DPDRRQ
DTCRA
SOS2 to SOS0
DTCRB
SOS2 to SOS0
DTCRC
SOS2 to SOS0
SOS decoder A
SOS decoder B
Channel
select
SOS decoder C
Figure 5.8 Concept of Address Bus Circuits
111
Data bus, lower 8 bits
DTDRH
DPDRRQ
Data bus, upper 8 bits
[Module master data bus]
DTDRL
DPDRRH
Select
Select
DPDRRL
DPDRWH
Select
Select
[Module slave data bus]
Data Bus Operations: Figure 5.9 shows a conceptual diagram of the DTU data-bus circuits. The
DTU temporary data registers (DTDRH/L) are connected to a 16-bit data bus. Data is read into the
DTDR registers in a read cycle, and written out from the DTDR registers in a write cycle. The PBI
data registers (DPDR) are connected to an 8-bit data bus. Data is read into DPDRRQ or
DPDRRH/L in a master read cycle, and written out from DPDRWH/L in a master write cycle.
DPDRWL
Figure 5.9 Concept of Data Bus Circuits
Table 5.16 Bus Operation in DTU Bus Cycles
Bus Cycle
Upper
Address Bus
Lower
Address Bus
Upper
Data Bus
Lower
Data Bus
Master read cycle (channel R)
DTARH →
DPDRRQ →
→ DPDRRQ
—
Master read cycle (channel A)
DTARH →
DTARA →
→ DPDRR
—
Master write cycle (channel B)
DTARH →
DTARB →
DPDRW →
—
Read cycle (RAM → I/O)
DTARH →
DTAR →
→ DTDRH
—
→ DTDRH
→ DTDRL
DTDRH →
—
DTDRH, L →
—
→ DTDRH
—
→ DTDRH, L
—
DTDRH →
—
DTDRH →
DTDRL →
Byte
Word
Write cycle (RAM → I/O)
Byte
H'FF →
SOS decoder →
Word
Read cycle (I/O → RAM)
Byte
H'FF →
SOS decoder →
Word
Write cycle (I/O → RAM)
Byte
Word
112
DTARH →
DTAR →
Address Register Boundary: The number of bytes of on-chip RAM transferred by the DTU is
determined by the DTAR settings and the boundary designated by DTCR bits BUD2 to BUD0.
(See page 87)
First, DTARH determines a 256-byte on-chip RAM area within which the DTU operates. BUD2
to BUD0 specify a 1-, 2-, 4-, 8-, 16-, 32-, 64-, or 128-byte boundary. These eight settings divide
the 256-byte area into 256, 128, 64, 32, 16, 8, 4, or 2 smaller areas, respectively, with boundary
addresses set on the boundaries between adjacent areas. The starting address of a transfer is given
by the contents of DTARA, DTARB, or DTARC. The ending address is the next boundary
address.
The contents of DTARA, DTARB, or DTARC are incremented at each transfer. When the transfer
is completed as far as the boundary address, a boundary overflow occurs. The DTARA, DTARB,
or DTARC contents do not increment past the boundary. The upper bits remain unchanged. The
lower bits are initialized to the value stored in RLAR. In normal mode, the DTE bit is cleared.
Figure 5.10 shows an example with 64-byte boundaries, in which the starting address is in the
exact center of a 64-byte area, so that a boundary overflow occurs when 32 bytes have been
transferred. In repeat mode, if there are further transfer requests, the transfer is repeated on the
same 32-byte area.
Boundory points
Set by BUD2
Lowest block address (H'xx00)
to BUD0
64 bytes
DTARA value
in repeat mode
Boundary address (H'xx3F)
Start address (H'xx60) →
32 bytes
32 bytes
Boundary address (H'xx7F)
64 bytes
Boundary address (H'xxBF)
64 bytes
Boundary address (H'xxFF)
Figure 5.10 Example of Memory Map with 64-Byte Boundary
(DTARH = H'xx, DTARA = H'60)
113
Ring Buffer Operation: In repeat mode, DTU channel B can operate as a ring buffer. In ring
buffer operation, a number of bytes equal to the boundary designation can be treated as a ring-type
FIFO buffer on RAM.
Data positions in this buffer are indicated by three pointers. The main pointer is DTARB, which
points to the address that will be accessed at the next transfer request. One auxiliary pointer is
RLARB, which points to the top address of a data block being transferred in accordance with a
transfer protocol. If the transfer fails, it can be repeated from the address indicated by RLARB.
The other auxiliary pointer is CPARB, which points to the top of the data that has not yet been
processed by the CPU. If DTARB catches up with CPARB and the two match, an overrun error
interrupt can be generated to report this abnormality.
Unprocessed data
Data block being
received
CPARB →
(Unprocessed
data pointer)
RLARB →
(Top
address)
DTARB →
(Receive
pointer)
Receive operation (writing to RAM)
Data block being
transmitted
RLARB →
(Top
address)
Untransmitted data
DTARB →
(Transmit
pointer)
CPARB →
(Unprocessed
data pointer)
Transmit operation (reading from RAM)
Figure 5.11 Pointer Operation in Ring Buffer
114
5.3.2
DTU and PBI Initialization
Care is required when setting up the DTU and PBI for DPRAM or handshake mode, because this
causes changes in the operating states of input/output pins. An initialization procedure for this
setup is given below and shown in figure 5.12. When some DTU channels are used for I/O transfer
instead of PBI transfer, these channels should be initialized after the procedure below. Register
contents are assumed to be initial values.
1. Write the upper byte of the address of the RAM area to be used by the DTU in DTARH.
This register is also used for I/O transfers. It must be initialized before I/O transfer begins.
2. Set the EWRQ bit in PCCSR to 1, or clear it to 0.
If this bit is set to 1, output from the WRQ pin is enabled when the DPME bit is set.
3-1. Set the HSCE bit in IOCR to 1, or clear it to 0.
This bit selects handshake mode or DPRAM mode when the DPME bit is set. The treatment
of the CS and RS2 to RS0 inputs differs between handshake mode and DPRAM mode.
3-2. Set the DPEA and DPEB bits in IOCR to 1 or 0.
In DPRAM mode, these bits select direct word mode or bound buffer mode. They also limit
access to DTARA, DTARB, DTCRA, and DTCRB. Some write accesses to registers that are
shared with other operating modes are disabled by hardware if they would interfere with the
operation of the other mode.
4. Set the DPME bit in SYSCR to 1.
This sets the pins to slave mode (DPRAM mode or handshake mode) according to the chip
operating mode (single-chip mode or expanded mode). Pins DDB7 to DDB0 (XDDB7 to
XDDB0) are set for input/output, CS (XCS), RS 2 to RS0, WE (XWE), and OE (XOE) for input,
and RDY (XRDY) and WRQ for output. Pins WRQ, CS, and RS2 to RS0 also depend on the
settings of the EWRQ and HSCE bits. At the same time, it becomes possible to set and clear
the QREF, MWEF, and MREF flags in PCCSR. The inputs at CS, WE, OE, etc. must be kept
at the inactive level until initialization is completed.
5. Set the EWAKAR, ERAKAR, EMWI, and EMRI bits in PCCSR to 1, or clear them to 0.
These bits select the usage of the RDY pin and enable or disable interrupts to the internal CPU.
The usage of the RDY pin can be set from the master CPU.
Data can now be transferred in DPRAM mode or handshake mode by accessing registers PCCSR,
DTCRA, DTCRB, DTARA, DTARB, DPDRRH, DPDRRL, DPDRWH, and DPDRWL according
to the operating mode.
115
Initial setup
1
Set DTARH
Initial setup for I/O transfer
2
Set PCCSR (EWRQ)
Set IOCR (RPEA/B/C)
3
Set IOCR (HSCE, DPEA, DPEB)
Set DTCRA/B/C
(SOS2 to SOS0, BUD2 to BUD0)
4
5
Set SYSCR (DPME)
Set PCCSR (EMWI, EMRI)
Set PCCSR (EWAKAR, ERAKAR)
Buffer query
operation in
DPRAM mode
DPRAM bound
buffer mode
DPRAM direct
word mode
Handshake mode
Carry out transfer, making
necessary settings in on-chip RAM,
DTARA/B/C, and DTCRA/B/C
Carry out transfer, making
necessary settings in on-chip RAM
and PCCSR
Carry out transfer, making
necessary settings in on-chip RAM,
DTARA/B, DTCRA/B, and PCCSR
Carry out transfer, making
necessary settings in DPDR registers
and PCCSR
Figure 5.12 DTU and PBI Initialization Flowchart
5.3.3
I/O Transfer Operations
The conditions under which I/O transfer is available are given below, with initialization and
operating procedures.
116
Conditions under Which I/O Transfer is Available
• Channel R
Permanently connected to the PBI. This channel is not available for I/O transfer.
• Channel A
Connected to the PBI when DPME = 1, HSCE = 0, and DPEA = 1. Available for I/O transfer
at other times.
• Channel B
Connected to the PBI when DPME = 1, HSCE = 0, and DPEB = 1. Available for I/O transfer at
other times.
• Channel C
Always available for I/O transfer.
I/O Transfer Procedure (See figure 5.13.)
1. Write the upper byte of the address of the RAM area to be used by the DTU in DTARH.
This register is also used for PBI transfers. It must be initialized before PBI transfer begins.
2. Set bits RPEA, RPEB, and RPEC in IOCR to 1 or clear them to 0 as necessary.
3. Set bits SOS2 to SOS0 and BUD2 to BUD0 in DTCRA, DTCRB, or DTCRC.
4. Initialize the on-chip supporting modules so that they will generate transfer requests for the
desired I/O transfer.
5. For a transfer from RAM to an on-chip supporting module register, place the data to be
transferred on RAM. Write the top address of the data on RAM in DTARA, DTARB, or
DTARC.
6. Set the DTE bit to 1 in DTARA, DTARB, or DTARC.
Set the DTIE bit to 1 in DTARA, DTARB, or DTARC as necessary.
7. Transfer requests are input from the on-chip supporting modules. The DTU responds by
transferring data, then clearing the transfer request. DTARA, DTARB, or DTARC is
incremented each time one byte is transferred. After repeated transfer requests, when the
transfer reaches the boundary, in normal mode, a boundary overflow occurs and the DTE bit is
cleared to 0. If the DTIE bit is set to 1, an interrupt is requested.
8. For a transfer from an on-chip supporting module to RAM, process the data transferred onto
RAM.
Steps 5 to 8 can be carried out repeatedly.
117
Initial setup
1
Set DTARH
2
Set IOCR (RPEA/B/C)
3
Set DTCRA/B/C (SOS2 to SOS0, BUD2 to BUD0)
4
Initialize and activate on-chip supporting modules
5
Set starting address in DTARA/B/C
6
Set DTE and DTIE bits
Executed by software
Wait for transfer request
Executed by hardware
7
Input transfer request and get bus right
Execute dead cycle
No
Transfer request confirmed?
Yes
Execute read cycle
Present
PBI transfer request?
Not present
Execute write cycle and release bus right
Increment DTARA/B/C
No
Repeat mode
Boundary reached?
Yes
What operating mode?
Normal mode
Clear DTE in DTCRA/B/C
If DTIE is 1, generate boundary
overflow interrupt
Figure 5.13 I/O Transfer Flowchart
118
Insert PBI transfer cycle
I/O Transfer Precautions: When using I/O transfer, note the following points.
• If software clears the DTE bit to 0, I/O operations will be suspended after the end of the bus
cycle currently being executed. Although this is not a boundary overflow, if the condition
DTE = 0 and DTIE = 1 is true, an interrupt request will be generated. To avoid generating an
interrupt request, when clearing DTE, clear the DTIE bit to 0 at the same time.
• While the DTE bit is set to 1, interrupt requests from the source selected by SOS2 to SOS0 will
not be sent to the interrupt controller.
Data should be prepared and processed after the DTE bit is cleared to 0, but if an interrupt
request is generated before the DTE flag is set to 1 again, this interrupt request will go to the
interrupt controller.
To have interrupts handled by I/O transfer and not treated as CPU interrupt requests, the time
taken to prepare and process data must be shorter than the time between interrupt requests. If
this is not possible, software should implement a double-buffering scheme by writing to
DTARA, DTARB, or DTARC at each boundary overflow to change the address.
• After a transfer request is accepted from a supporting module, if the same transfer request
occurs again before the old request is cleared (before the interrupt flag is cleared), the DTU
will be unable to recognize the new request. The interval between transfer requests should be
comfortably longer than the DTU’s turnaround time.
• If an I/O transfer is cancelled just when a transfer request occurs, the cancellation is carried out
during the dead cycle.
• The address relations of word access by the DTU need to be noted. In an I/O transfer, some
supporting-module registers are accessed by word access, in which case the on-chip RAM is
also accessed by word access. In word access, address bit 0 is disregarded, so the upper byte
must be located at an even address and the lower byte at an odd address. The supportingmodule registers satisfy this condition, but it is possible to write odd addresses in the DTU
address registers (DTARA, DTARB, DTARC) that specify the RAM address.
When making a word-access I/O transfer, write an even address in the DTU address register.
The transfer may not be performed as intended if an odd address is written. For example, if
H'01 is written and word access is performed, the lower address bits will be output as H'00 in
access to the upper byte, and H'01 in access to the lower byte.
119
5.3.4
Buffer Query in DPRAM Mode
Buffer query in DPRAM mode provides a parallel interface with random access (read access) to a
maximum 256 bytes of on-chip RAM. The interface makes use of DTU channel R to execute PBI
transfers. Buffer query operations are depicted in block-diagram form in figure 5.14.
Master CPU
(H8 microcontroller)
PBI: buffer query operation in DPRAM mode
CPU address
DTU address
CS
RS2 to RS0
On-chip
RAM
CPU
Data bus
DTARH DPDRRQ
QREF
Data bus
Decoder
A15 to A3
A2 to A0
WE
WR
OE
RD
WRQ
DDB7 to
DDB0
WAIT
D7 to D0
Figure 5.14 Buffer Query in DPRAM Mode
The conditions under which buffer query is available are given below, with initialization and
operating procedures.
Conditions under Which Buffer Query is Available: Buffer query is available whenever the
HSCE bit is cleared to 0 and the DPME bit is set to 1, enabling use of DPRAM-related pin
functions. Availability is not affected by the mode of DTU channels A and B (DPRAM bound
buffer mode or DPRAM direct word mode).
Initialization and Operating Procedures (See figure 5.15.)
1. Initialize the DTU and PBI by the DTU/PBI initialization procedure.
DTARH is also used in I/O transfers and DPRAM bound buffer mode. It must be initialized
before these transfers begin. The EWRQ bit in PCCSR and the WRQ pin are also used in
DPRAM bound buffer mode and DPRAM direct word mode. The initial settings must be free
of conflict between modes.
2. When the master CPU writes to DPDRRQ, the QREF flag in PCCSR is set to 1 to indicate that
DPDRRQ contains the lower 8 bits of an on-chip RAM address.
3. A transfer request is generated for DTU channel R, and the bus right is acquired for a master
read cycle.
120
4. The contents of the on-chip RAM address indicated by DTARH and DPDRRQ are transferred
to DPDRRQ. The QREF flag is cleared to 0 to indicate that DPDRRQ contains a copy of onchip RAM data.
5. The master CPU should check that the QREF flag is 0, then read DPDRRQ.
Precaution on Use of Buffer Query in DPRAM Mode: When using buffer query in DPRAM
mode, note the following point:
If the master CPU reads DPDRRQ while QREF = 1, the WRQ pin will stay at the low output level
until QREF is cleared. If the master CPU does not use WRQ as a wait request signal, leave a
sufficient interval from DPDRRQ write to DPDRRQ read to be sure that the transfer has been
carried out.
Internal CPU
Trigger
Master CPU
Initial setup
1
Set DTARH
Executed by software
Set PCCSR (EWRQ)
Executed by hardware
Set SYSCR (DPME) and IOCR (HSCE)
Prepare data on on-chip RAM
Wait for transfer request
WE ↑
3
2
Write on-chip RAM address
in DPDRRQ
Set QREF in PCCSR and get bus right
1
4
Transfer data from on-chip RAM
to DPDRRQ
Clear QREF in PCCSR and
release bus right
QREF
0
5
Read DPDRRQ
Figure 5.15 Flowchart of Buffer Query in DPRAM Mode
121
5.3.5
Operation in DPRAM Bound Buffer Mode
DPRAM bound buffer mode provides a parallel interface with sequential access to a maximum
128 bytes of on-chip RAM. The interface makes use of PBI transfers executed by DTU channels
A and B.
The conditions under which DPRAM bound buffer mode is available are given below, with
initialization and operating procedures.
Conditions under Which DPRAM Bound Buffer Mode is Available
• DPRAM bound buffer mode, read access (DTU channel A)
Available when DPME = 1, HSCE = 0, and DPEA = 1.
• DPRAM bound buffer mode, write access (DTU channel B)
Available when DPME = 1, HSCE = 0, and DPEB = 1.
Initialization Procedure: Initialize the DTU and PBI by the DTU/PBI initialization procedure.
DTARH is also used in I/O transfers, and in DPRAM buffer queries. It must be initialized before
these transfers begin.
The EWRQ bit in PCCSR and the WRQ and RDY pins are also used in DPRAM buffer queries
and DPRAM direct word mode. The initial settings must be free of conflict between modes. (See
tables 5.8 and 5.9.)
122
Read Procedure for DPRAM Bound Buffer Mode: DPRAM bound buffer mode provides a
parallel interface with sequential read access to a maximum 128 bytes of on-chip RAM, using PBI
transfers executed by DTU channel A. Read operations in DPRAM bound buffer mode are
depicted in block-diagram form in figure 5.16.
Master CPU
(H8 microcontroller)
PBI: DPRAM bound buffer mode, read access
CPU address
DTU address
CS
DTCRA
DTARH
On-chip
RAM
CPU
Data bus
RS2 to RS0
DTARA
DPDRRH
MREF
DPDRRL
Data bus
Decoder
A15 to A3
A2 to A0
WE
WR
OE
RD
RDY
WRQ
DDB7 to
DDB0
IRQ
WAIT
D7 to D0
Figure 5.16 Read Access in DPRAM Bound Buffer Mode
123
The read procedure for DPRAM bound buffer mode is given below. (See figure 5.17.)
1. The internal CPU prepares the data to be transferred on on-chip RAM. The data should be
located on contiguous addresses. Position the top address so that the last data will be located on
a boundary address. The internal CPU sets the boundary in DTCRA and the top address in
DTARA.
2. The internal CPU clears the MREF flag in PCCSR to notify the master CPU that preparations
for the transfer are completed. If the ERAKAR bit is set to 1 in PCCSR, a low RDY signal is
output.
3. The master CPU learns from the state of the RDY signal or MREF flag that transfer
preparations have been completed, reads the boundary value in DTCRA and top address in
DTARA, and calculates the number of bytes of data. The RDY output goes high. Then the
master CPU reads the DPDRR registers a number of times equal to the number of data bytes.
4. When the master CPU reads DPDRR, the PBI requests a transfer on DTU channel A. The
DTU gets the bus right and executes a master read cycle, transferring the contents of the onchip RAM address specified by DTARH and DTARA to an empty DPDRR register. Even and
odd addresses in DTARA correspond to DPDRRH and DPDRRL, respectively. When the
master CPU reads the DPDRR registers, it receives their data in the same order in which the
data was transferred to the DPDRR registers. After being read, each DPDRR register becomes
empty. Each time a DPDRR register becomes empty, the PBI requests another transfer on
DTU channel A, to keep the DPDRR registers in the full state.
5. Each time it transfers one byte, the DTU increments DTARA. When the transfer reaches the
boundary, a boundary overflow occurs and the MREF flag is set to 1. If the EMRI bit is set to
1, an interrupt is requested.
Steps 1 to 5 can be carried out repeatedly.
124
Internal CPU
Trigger
Master CPU
Initial setup
Set DTARH
Executed by software
Set PCCSR (EWRQ)
Executed by hardware
Set SYSCR (DPME) and IOCR
(HSCE, DPEA)
Set PCCSR (EMRI)
MMREF
0
1
1
Prepare data on on-chip RAM
Set DTCRA (BUD2 to BUD0)
and DTARA
RDY ↓
Clear MREF in PCCSR; RDY goes low
2
OE ↑
MREF
Get bus right and transfer data from
on-chip RAM to DPDRR
4
5
0
3
Increment DTARA and release bus right
Yes
1
OE ↑
Boundary overflow?
Read DTCR (BUD2 to BUD0) and
DTARA; RDY goes high
Read DPDRR
No
No
DPDRR register empty?
Yes
All bytes read?
No
Yes
Set MREF in PCCSR
Process data
Figure 5.17 Flowchart of Read Operations in DPRAM Bound Buffer Mode
125
Write Procedure for DPRAM Bound Buffer Mode: DPRAM bound buffer mode provides a
parallel interface with sequential write access to a maximum 128 bytes of on-chip RAM, using
PBI transfers executed by DTU channel B. Write operations in DPRAM bound buffer mode are
depicted in block-diagram form in figure 5.18.
Master CPU
(H8 microcontroller)
PBI: DPRAM bound buffer mode, write access
CPU address
DTU address
CS
DTCRB
DTARH
On-chip
RAM
CPU
Data bus
RS2 to RS0
DTARB
DPDRWH
MWEF
DPDRWL
Data bus
Decoder
A2 to A0
WE
WR
OE
RD
RDY
WRQ
DDB7 to
DDB0
Figure 5.18 Write Access in DPRAM Bound Buffer Mode
126
A15 to A3
IRQ
WAIT
D7 to D0
The write procedure for DPRAM bound buffer mode is given below. (See figure 5.19.)
1. The internal CPU processes the data transferred to on-chip RAM, then clears the MWEF flag
in PCCSR to notify the master CPU that it is ready for the next transfer. If the EWAKAR bit is
set to 1 in PCCSR, a low RDY signal is output.
2. The master CPU learns from the state of the RDY signal or MWEF flag that transfer
preparations have been completed, prepares data, and writes the top address in DTARB and the
boundary of a destination area in on-chip RAM in DTCRB. The RDY output goes high. The
master CPU writes all the data it has prepared to the DPDRW registers.
3. Each time the master CPU writes to the DPDRW registers, the data goes into a DPDRW
register, which thereby becomes full. The PBI generates a transfer request for DTU channel B.
The DTU transfers the data from the full DPDRW register to the on-chip RAM address
specified by DTARH and DTARB. Even and odd addresses in DTARB correspond to
DPDRWH and DPDRWL, respectively. Data is transferred in the order in which written. Each
time data is written, the PBI requests a transfer on DTU channel B, to keep the DPDRW
registers in the empty state.
4. Each time it transfers one byte, the DTU increments DTARB. When the transfer reaches the
boundary, a boundary overflow occurs and the MWEF flag is set to 1. If the EMWI bit is set to
1, an interrupt is requested.
Steps 1 to 4 can be carried out repeatedly.
127
Internal CPU
Master CPU
Trigger
Initial setup
Set DTARH
Executed by software
Set PCCSR (EWRQ)
Executed by hardware
Set SYSCR (DPME) and
IOCR (HSCE, DPEB)
Set PCCSR (EWAKAR); RDY goes low
RDY ↓
Set PCCSR (EMWI)
1
RDY ↓
Clear MWEF in PCCSR; RDY goes low
1
MWEF
0
No
2
Yes
3
4
Process data
DPDRW register full?
Set DTCRB (BUD2 to BUD0) and
DTARB; RDY goes high
Get bus right and transfer data from
DPDRW to on-chip RAM
WE ↑
Write to DPDRW
Increment DTARB and release bus right
Boundary overflow?
No
All bytes written?
Yes
Yes
Set MWEF in PCCSR
Process data
Figure 5.19 Flowchart of Write Operations in DPRAM Bound Buffer Mode
128
No
Precautions on Use of DPRAM Bound Buffer Mode: When using DPRAM bound buffer mode,
note the following points:
• If the master CPU reads a DPDRR register while it is empty, the WRQ pin will stay at the low
output level until the register becomes full. If the master CPU does not use WRQ as a wait
request signal, leave sufficient intervals between reads to be sure that the transfer is carried out.
• If the master CPU writes to a DPDRW register while it is full, the WRQ pin will stay at the
low output level until the register becomes empty. If the master CPU does not use WRQ as a
wait request signal, leave sufficient intervals between writes to be sure that the transfer is
carried out.
• MWEF is initially 0, so when the EWAKAR bit is set to 1, the RDY output will go low
immediately. Be careful of this at the start of the first transfer.
• The RDY pin is shared by master read and master write in both DPRAM bound buffer mode
and DPRAM direct word mode. If the master CPU uses RDY as an interrupt input, when it
tries to learn the internal state of the DPRAM, there may be competing interrupt conditions.
The master CPU should control the RDY output by using the ERAKAR and EWAKAR bits, or
should check the MREF and MWEF flags at the start and end of transfer processing.
5.3.6
Operation in DPRAM Direct Word Mode
DPRAM direct word mode does not use the DTU. Read and write operations in DPRAM direct
word mode are depicted in block-diagram form in figure 5.20.
Master CPU
(H8 microcontroller)
PBI: DPRAM direct word mode
CS
Decoder
A15 to A3
Data bus
RS2 to RS0
CPU
DPDRRH
DPDRWH
MREF
DPDRRL
A2 to A0
WE
WR
OE
RD
MWEF
DPDRWL
RDY
DDB7 to
DDB0
IRQ
D7 to D0
Figure 5.20 Read/Write Access in DPRAM Direct Word Mode
129
The conditions under which DPRAM direct word mode is available are given below, with
initialization and operating procedures.
Conditions under Which DPRAM Direct Word Mode is Available
• DPRAM direct word mode, read access
Available when DPME = 1, HSCE = 0, and DPEA = 0.
• DPRAM direct word mode, write access
Available when DPME = 1, HSCE = 0, and DPEB = 0.
Initialization Procedure: Initialize the DTU and PBI by the DTU/PBI initialization procedure.
The RDY pin is also used in DPRAM bound buffer mode. The initial settings must be free of
conflict between modes. The initial state of the RDY pin is the high impedance state in single-chip
mode, and the high output state in expanded modes.
Read Procedure for DPRAM Direct Word Mode: For read access, DPRAM direct word mode
provides a parallel interface with two data-register bytes that can be read by the master CPU and
written to by the internal CPU. The read procedure for DPRAM direct word mode is given below.
(See figure 5.21.)
1. The internal CPU writes data in DPDRRH and DPDRRL. Writing to DPDRRL clears the
MREF flag in PCCSR. If the ERAKAR bit is set to 1 in PCCSR, a low RDY signal is output.
2. From the state of the RDY signal or MREF flag, the master CPU learns that the internal CPU
has finished writing data. The master CPU now reads DPDRRH and DPDRRL. Reading
DPDRRL sets the MREF flag to 1 in PCCSR. If the EMRI bit is set to 1, an interrupt is
requested. The RDY output goes to the high impedance state in single-chip mode, and to the
high output state in expanded modes.
130
Internal CPU
Trigger
Master CPU
Initial setup
Set PCCSR (EWRQ)
Executed by software
Set SYSCR (DPME) and
IOCR (HSCE, DPEA)
Executed by hardware
Set PCCSR (EMRI)
MREF
0
1
1
Set PCCSR (ERAKAR)
Write data in DPDRR registers
At DPDRRL write, MREF is cleared
and RDY goes low
RDY ↓
MREF
1
0
At DPDRRL read, MREF is set
and RDY goes high
OE ↑
2
Read DPDRR
Process data
Figure 5.21 Flowchart of Read Operations in DPRAM Direct Word Mode
131
Write Procedure for DPRAM Direct Word Mode: For write access, DPRAM direct word mode
provides a parallel interface with two data-register bytes that can be written to by the master CPU
and read by the internal CPU. The write procedure for DPRAM direct word mode is given below.
(See figure 5.22.)
1. From the state of the RDY signal or MWEF flag, the master CPU learns that the internal CPU
has finished reading, and writes to DPDRWH and DPDRRL. Writing to DPDRWL sets the
MWEF flag to 1 in PCCSR. If the EMWI bit is set to 1, an interrupt is requested. The RDY
output goes to high impedance state in single-chip mode, and to high output state in expanded
modes.
2. The internal CPU reads the data in DPDRWH and DPDRWL. Reading DPDRWL clears the
MWEF flag in PCCSR. If the EWAKAR bit is set to 1 in PCCSR, a low RDY signal is output.
Internal CPU
Trigger
Master CPU
Initial setup
Set PCCSR (EWRQ)
Set SYSCR (DPME) and
IOCR (HSCE, DPEB)
Set PCCSR (EWAKAR)
Set PCCSR (EMWI)
2
At DPDRWL read, MWEF is cleared
and RDY goes low
RDY ↓
1
MWEF
0
Process data
At DPDRWL write, MWEF is set
and RDY goes high
Prepare data
WE ↑ 1
Write to DPDRW
Figure 5.22 Flowchart of Write Operations in DPRAM Direct Word Mode
132
Precautions on Use of DPRAM Direct Word Mode: When using DPRAM direct word mode,
note the following points:
• MWEF is initially 0, so when the EWAKAR bit is set to 1, the RDY output will go low
immediately. Be careful of this at the start of the first transfer.
• The RDY pin is shared by master read and master write in both DPRAM bound buffer mode
and DPRAM direct word mode. If the master CPU uses RDY as an interrupt input, when it
tries to learn the internal state of the DPRAM, there may be competing interrupt conditions.
The master CPU should control the RDY output by using the ERAKAR and EWAKAR bits, or
should check the MREF and MWEF bits at the start and end of transfer processing.
5.3.7
Operation in Handshake Mode
Handshake mode provides a parallel interface in which data is passed through an 8-bit port one
byte at a time. Figure 5.23 depicts handshake mode in block-diagram form. Figure 5.24 shows
typical interconnections for handshaking communication.
Other chip
PBI: handshake mode
Data bus
WE
OE
CPU
DPDRRL
MREF
DPDRWL
MWEF
RDY
WRQ
DDB7 to
DDB0
Figure 5.23 Transfers in Handshake Mode
133
Transmit
interface
Receive
interface
(PBI)
WRQ
WE
MREF
OE
RDY
WE
WRQ
MWEF
RDY
Transmit
interface
MREF
Receive
interface
OE
DPDRWL
DPDRRL
DPDRWL
MWEF
DDB7 to
DDB0
DBB7 to
DBB0
(PBI)
DPDRRL
Figure 5.24 Interconnections for Handshake Mode (Example)
The conditions under which handshake mode is available are given below, with initialization,
transmit, and receive procedures.
Conditions under Which Handshake Mode is Available, and Initialization Procedure
• Conditions under which handshake mode is available
Available when DPME = 1 and HSCE = 1.
• Initialization procedure
Initialize the DTU and PBI by the DTU/PBI initialization procedure.
Transmit Procedure in Handshake Mode: In transmitting in handshake mode, when the data
register contents are output, a latch pulse is output from the WRQ pin to write the data into the
handshake interface circuits in the receiving device. The transmit procedure for handshake mode is
given below. (See figure 5.25.)
1. The internal CPU reads the MREF flag, checks that it is set to 1, and writes data in DPDRRL.
The PBI then clears the MREF flag to 0 and outputs a low signal from the WRQ pin.
2. The PBI checks the state of the OE pin and outputs the DPDRRL contents if OE is low. After
eight system clocks, the PBI automatically drives the WRQ output to the high level.
3. The PBI checks the state of the OE pin. When OE goes high, the PBI stops data output, places
the data lines in the high-impedance state, and sets the MREF flag to 1.
134
Transmitting interface (PBI)
Trigger
Receiving interface
Initial setup
Set PCCSR (EWRQ)
Executed by software
Set SYSCR (DPME) and IOCR (HSCE)
Executed by hardware
Set PCCSR (EMRI)
1
0
MREF
1
Write data in DPDRRL
WRQ ↓
At DPDRRL write, MREF is cleared
OE ↓ Yes
2
High
Ready to receive data?
No
OE
Low
Output DPDRRL data
No
3
Eight system
clocks elapsed?
Set MREF
Yes
WRQ ↑
OE ↑
Latch data
Process data
Figure 5.25 Flowchart of Transmit Operations in Handshake Mode
135
Receive Procedure in Handshake Mode: In receiving in handshake mode, data input from the
handshake interface in the transmitting device is read into the data register on a latch pulse input
from the WE pin. (See figure 5.26.)
1. The PBI checks the states of the OE and WE pins. If a high-to-low transition of WE occurs
while OE is high, a low signal is output from the RDY pin.
2. When WE goes high, the PBI latches the data into DPDRWL on the rising edge of WE and
sets the MWEF bit to 1.
3. The internal CPU reads MWEF, checks that it is set to 1, and reads DPDRWL. The PBI then
clears MWEF to 0 and drives the RDY output to the high level.
136
Receiving interface (PBI)
Trigger
Transmitting interface
Initial setup
Set PCCSR (EWRQ)
Executed by software
Set SYSCR (DPME) and IOCR (HSCE)
Executed by hardware
Set PCCSR (EMWI)
WE ↓
Preparations to transmit data completed
High
WE
Low
Low
1
RDY ↓
OE
High
Low
WE ↑
(Ready to receive data)
Data transmission completed
2
WE
High
Latch data into DPDRWL
Set MWEF
3
Read MWEF, then read DPDRWL
RDY ↑
(Data reception completed)
Clear MWEF
Process data
Figure 5.26 Flowchart of Receive Operations in Handshake Mode
137
Precautions on Use of Handshake Mode: When using handshake mode, note the following
points.
• In handshake mode, it is possible to transmit and receive simultaneously, but care is required
because the data bus is shared.
Figures 5.27 and 5.28 (transmit) and 5.29 and 5.30 (receive) show typical interconnections for
simultaneous transmitting and receiving with a device having an identical handshake mode. If
both ends of the bidirectional WRQ line are brought from high to low at the same time, both
OE pins will go high simultaneously and the data will collide. To avoid this, both devices
should use a protocol in which they transmit and receive in turn, so that transmit requests will
not occur simultaneously.
• If the interface is used only for transmitting, the input at the WE pin should be held at the high
level. For receive-only usage, the OE input should be held at the high level and the EWRQ bit
should be cleared to 0 in PCCSR, since the WRQ output is not needed.
WE
Transmitting interface (PBI)
MREF
DPDRRL
Held high for
transmit-only
Receiving interface
WRQ
OE
DDB7 to
DDB0
Figure 5.27 Transmitting in Handshake Mode
WRQ
8 system clocks
OE
DBB7 to
DBB0
DPDRRL
write
MREF
Figure 5.28 Transmit Timing in Handshake Mode
138
Receiving interface (PBI)
Transmitting interface
WE
OE
Held high for
receive-only
RDY
MWEF
DPDRWL
DDB7 to
DDB0
Figure 5.29 Receiving in Handshake Mode
WE
RDY
Does not go low until OE is high
DBB7 to
DBB0
DPDRWL
read
MWEF
Figure 5.30 Receive Timing in Handshake Mode
139
5.4
Application Notes
5.4.1
DTU and PBI Processing Time
PBI transfers due to buffer queries in DPRAM mode and some PBI transfers in DPRAM bound
buffer mode are initiated by the rising edge of the WE or OE input signal when the PBI is
accessed. The master CPU may receive a wait request from the WRQ pin if it accesses the PBI
again after the edge is detected but before the PBI transfer is completed.
The way to avoid this situation is to know how much time DTU and PBI processing takes, and
allow sufficient intervals between PBI accesses. Examples are given below. In all these examples
the master CPU is an H8 microcontroller.
(1) When the master CPU accesses a PBI data register (DPDRRQ, DPDRRH/L, DPDRWH/L),
the DTU is activated. The time until the same data register can be accessed again is the sum of the
following three periods:
• Transfer request detection lag: time lag from the detection of a rising edge at the WE or OE pin
until the transfer request occurs
• Bus cycle waiting time (maximum 6 states + wait states): time until the end of the bus cycle
being executed when the transfer request occurs
• DPRAM cycle (2 states + wait states): time for executing the bus cycle that transfers data
between on-chip RAM and the PBI
The transfer request detection lag depends on the operating mode. In DPRAM bound buffer mode,
it is a maximum of 3.5 states, and in buffer query in DPRAM mode, it is a maximum of 3 states. If
external memory is used instead of on-chip memory, and if the external memory is accessed with
wait states, the maximum value of the bus cycle waiting time depends on the number of wait
states.
(2) In DPRAM bound buffer mode, the master CPU may access the PBI by byte access or word
access. In word access, the minimum detectable interval (strobe interval) between the rising edges
of OE and WE of two bytes is two states.
(3) If input pins RS 2 to RS0 specify an unusable DPRAM data register and if pin CS is low, then
pin WRQ also goes low. When pin WRQ is not used and the access interval is the time between
the rising edge of OE and WE and the next confirmation of RS2 to RS0 and CS input, the
following intervals become necessary.
• Bound buffer mode access interval: 9.5 states (see figure 5.31)
• Buffer query address write to data read access interval: 11 states (see figure 5.32)
The above are consecutive accesses with the same channel. If different channels are used
simultaneously, the PBI executes in order of the priority sequence of the channels. For accesses
140
with a low priority channel, the DPRAM cycle time executed first must be added to the access
time.
(4) Allowances for the times described in (1) to (3) above should be made with the master CPU
operating frequency and AC characteristics taken into consideration. To make allowances for the
strobe interval in a 3-state no-wait master CPU access, a master CPU with an operating frequency
up to 1.5 times that of the interval CPU can be connected. In this case, the access intervals in (3)
above become 14.25 states and 16.5 states of the master CPU. However, the output delay from the
master CPU and the PBI input setup time for OE, WE, CS, and RS are different for each signal,
and so adequate allowances must be made for these differences.
Transfer request
detection time lag
(max. 3.5 states)
Bus cycle wait time
(max. 3 × 2 states)
DPRAM
cycle
(2 states)
DPRAM
cycle
(2 states)
ø
RS0 to
RS2
Target data register not selected
OE/WE
Access interval (min. 9.5 states)
Strobe
interval
(min. 2 states)
Figure 5.31 Bound Buffer Mode Access Interval
Transfer
request detection
time lag
(max. 3 states)
CPU cycle wait time
(max. 3 × 2 states)
DPRAM
cycle
(2 states)
ø
RS0 to
RS2
Target data register not selected
OE/WE
Access interval (min. 11 states)
Figure 5.32 Buffer Query Mode Address Write to Data Read Access Interval
141
Section 6 Wait-State Controller
6.1
Overview
The H8/3318 has an on-chip wait-state controller that enables insertion of wait states into bus
cycles for interfacing to low-speed external devices.
6.1.1
Features
Features of the wait-state controller are listed below.
• Three selectable wait modes: programmable wait mode, pin auto-wait mode, and pin wait
mode
• Automatic insertion of zero to three wait states
6.1.2
Block Diagram
WAIT
Wait-state controller
(WSC)
WSCR
Internal data bus
Figure 6.1 shows a block diagram of the wait-state controller.
Wait request
signal
Legend
WSCR: Wait-state control register
Figure 6.1 Block Diagram of Wait-State Controller
143
6.1.3
Input/Output Pins
Table 6.1 summarizes the wait-state controller’s input pin.
Table 6.1
Wait-State Controller Pins
Name
Abbreviation
I/O
Function
Wait
WAIT
Input
Wait request signal for access to external addresses
6.1.4
Register Configuration
Table 6.2 summarizes the wait-state controller’s register.
Table 6.2
Register Configuration
Address
Name
Abbreviation
R/W
Initial Value
H'FFC2
Wait-state control register
WSCR
R/W
H'08
6.2
Register Description
6.2.1
Wait-State Control Register (WSCR)
WSCR is an 8-bit readable/writable register that selects the wait mode for the wait-state controller
(WSC) and specifies the number of wait states. It also controls frequency division of the clock
signals supplied to the supporting modules.
Bit
7
6
5
4
3
2
1
0
—
—
CKDBL
—
WMS1
WMS0
WC1
WC0
Initial value
1
1
0
1
1
0
0
0
Read/Write
—
—
R/W
—
R/W
R/W
R/W
R/W
WSCR is initialized to H'C8 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
144
Bits 7 and 6—Reserved: These bits cannot be modified and are always read as 1.
Bit 5—Clock Double (CKDBL): Controls frequency division of clock signals supplied to
supporting modules. For details, see section 7, Clock Pulse Generator.
Bit 4—Reserved: This bit is reserved, but it can be written and read. Its initial value is 0.
Bits 3 and 2—Wait Mode Select 1 and 0 (WMS1/0): These bits select the wait mode.
Bit 3
WMS1
Bit 2
WMS0
Description
0
0
Programmable wait mode
1
No wait states inserted by wait-state controller
0
Pin wait mode
1
Pin auto-wait mode
1
(Initial value)
Bits 1 and 0—Wait Count 1 and 0 (WC1/0): These bits select the number of wait states inserted
automatically in access to external address areas.
Bit 1
WC1
Bit 0
WC0
Description
0
0
No wait states inserted automatically by wait-state controller (Initial value)
1
1 state inserted
0
2 states inserted
1
3 states inserted
1
145
6.3
Wait Modes
Programmable Wait Mode: The number of wait states (TW ) selected by bits WC1 and WC0 are
inserted in all accesses to external addresses. Figure 6.2 shows the timing when the wait count is 1
(WC1 = 0, WC0 = 1).
T1
T2
TW
T3
ø
Address bus
External address
AS
RD
Read
access
Read data
Data bus
WR
Write
access
Data bus
Write data
Figure 6.2 Programmable Wait Mode
146
Pin Wait Mode: In all accesses to external addresses, the number of wait states (TW) selected by
bits WC1 and WC0 are inserted. If the WAIT pin is low at the fall of the system clock (ø) in the
last of these wait states, an additional wait state is inserted. If the WAIT pin remains low, wait
states continue to be inserted until the WAIT signal goes high.
Pin wait mode is useful for inserting four or more wait states, or for inserting different numbers of
wait states for different external devices.
Figure 6.3 shows the timing when the wait count is 1 (WC1 = 0, WC0 = 1) and one additional wait
state is inserted by WAIT input.
T1
T2
ø
Inserted by
wait count
Inserted by
WAIT signal
TW
TW
*
T3
*
WAIT pin
Address bus
External address
AS
Read
access
RD
Read data
Data bus
WR
Write
access
Data bus
Write data
Note: * Arrows indicate time of sampling of the WAIT pin.
Figure 6.3 Pin Wait Mode
147
Pin Auto-Wait Mode: If the WAIT pin is low, the number of wait states (TW) selected by bits
WC1 and WC0 are inserted.
In pin auto-wait mode, if the WAIT pin is low at the fall of the system clock (ø) in the T2 state, the
number of wait states (TW ) selected by bits WC1 and WC0 are inserted. No additional wait states
are inserted even if the WAIT pin remains low. Pin auto-wait mode can be used for an easy
interface to low-speed memory, simply by routing the chip select signal to the WAIT pin.
Figure 6.4 shows the timing when the wait count is 1.
T1
ø
T2
T3
T1
T2
*
TW
T3
*
WAIT pin
Address bus
External address
External address
AS
RD
Read
access
Read data
Read data
Data bus
WR
Write
access
Data bus
Write data
Note: * Arrows indicate time of sampling of the WAIT pin.
Figure 6.4 Pin Auto-Wait Mode
148
Write data
Section 7 Clock Pulse Generator
7.1
Overview
The H8/3318 has a built-in clock pulse generator (CPG) consisting of an oscillator circuit, a duty
adjustment circuit, and a divider and a prescaler that generates clock signals for the on-chip
supporting modules.
7.1.1
Block Diagram
Figure 7.1 shows a block diagram of the clock pulse generator.
XTAL
EXTAL
ø
(system
clock)
Duty
adjustment
circuit
Oscillator
circuit
øP
(for supporting
modules)
Prescaler
Frequency
divider (1/2)
CKDBL
øP/2 to øP/4096
Figure 7.1 Block Diagram of Clock Pulse Generator
Input an external clock signal to the EXTAL pin, or connect a crystal resonator to the XTAL and
EXTAL pins. The system clock frequency (ø) will be the same as the input frequency. This same
system clock frequency (øP) can be supplied to timers and other supporting modules, or it can be
divided by two. The selection is made by software, by controlling the CKDBL bit.
7.1.2
Wait-State Control Register (WSCR)
WSCR is an 8-bit readable/writable register that controls frequency division of the clock signals
supplied to the supporting modules. It also controls wait-state insertion.
WSCR is initialized to H'C8 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit
7
6
5
4
3
2
1
0
—
—
CKDBL
—
WMS1
WMS0
WC1
WC0
Initial value
1
1
0
1
1
0
0
0
Read/Write
—
—
R/W
—
R/W
R/W
R/W
R/W
149
Bits 7 and 6—Reserved: These bits cannot be modified and are always read as 1.
Bit 5—Clock Double (CKDBL): Controls the frequency division of clock signals supplied to
supporting modules.
Bit 5
CKDBL
Description
0
The undivided system clock (ø) is supplied as the clock (ø P) for supporting modules
(Initial value)
1
The system clock (ø) is divided by two and supplied as the clock (ø P) for supporting
modules
Bit 4—Reserved: This bit is reserved, but it can be written and read. Its initial value is 0.
Bits 3 and 2—Wait Mode Select 1 and 0 (WMS1/0)
Bits 1 and 0—Wait Count 1 and 0 (WC1/0)
These bits control wait-state insertion. For details, see section 6, Wait-State Controller.
7.2
Oscillator Circuit
If an external crystal is connected across the EXTAL and XTAL pins, the on-chip oscillator circuit
generates a system clock signal. Alternatively, an external clock signal can be applied to the
EXTAL pin.
7.2.1
Connecting an External Crystal
Circuit Configuration: An external crystal can be connected as in the example in figure 7.2.
Table 7.1 indicates the appropriate damping resistance Rd. An AT-cut parallel resonance crystal
should be used.
C L1
EXTAL
XTAL
Rd
C L2
C L1 = C L2 = 10 pF to 22 pF
Figure 7.2 Connection of Crystal Oscillator (Example)
150
Table 7.1
Damping Resistance
Frequency (MHz)
2
4
8
10
12
16
Rd (Ω)
1k
500
200
0
0
0
Crystal Oscillator: Figure 7.3 shows an equivalent circuit of the crystal resonator. The crystal
resonator should have the characteristics listed in table 7.2.
CL
L
Rs
XTAL
EXTAL
C0
AT-cut parallel resonating crystal
Figure 7.3 Equivalent Circuit of External Crystal
Table 7.2
External Crystal Parameters
Frequency (MHz)
2
4
8
10
12
16
Rd max (Ω)
500
120
80
70
60
50
C0 (pF)
7 pF max
7 pF max
7 pF max
7 pF max
7 pF max
7 pF max
Use a crystal with the same frequency as the desired system clock frequency (ø).
Note on Board Design: When an external crystal is connected, other signal lines should be kept
away from the crystal circuit to prevent induction from interfering with correct oscillation. See
figure 7.4. The crystal and its load capacitors should be placed as close as possible to the XTAL
and EXTAL pins.
151
Not allowed
Signal A
Signal B
C L2
XTAL
EXTAL
C L1
Figure 7.4 Notes on Board Design around External Crystal
7.2.2
Input of External Clock Signal
Circuit Configuration: An external clock signal can be input as shown in the examples in figure
7.5. In example (b) in figure 7.5, the external clock signal should be kept high during standby.
If the XTAL pin is left open, make sure the stray capacitance does not exceed 10 pF.
EXTAL
XTAL
External clock input
Open
(a) Connections with XTAL pin left open
EXTAL
External clock input
74HC04
XTAL
(b) Connections with inverted clock input at XTAL pin
Figure 7.5 External Clock Input (Example)
152
External Clock Input: The external clock signal should have the same frequency as the desired
system clock (ø). Clock timing parameters are given in table 7.3 and figure 7.6.
Table 7.3
Clock Timing
VCC = 2.7 to
5.5 V
VCC = 4.0 to
5.5 V
VCC = 5.0 V
±10%
Item
Symbol
Min
Max
Min
Max
Min
Max
Unit Test Conditions
Low pulse
width of external
clock input
t EXL
40
—
30
—
20
—
ns
t EXH
High pulse
width of external
clock input
40
—
30
—
20
—
ns
External clock
rise time
t EXr
—
10
—
10
—
5
ns
External clock
fall time
t EXf
—
10
—
10
—
5
ns
Clock pulse
width low
t CL
0.3
0.7
0.3
0.7
0.3
0.7
t cyc
0.4
0.6
0.4
0.6
0.4
0.6
t cyc
ø ≥ 5 MHz Figure
ø < 5 MHz 19.4
Clock pulse
width high
t CH
0.3
0.7
0.3
0.7
0.3
0.7
t cyc
ø ≥ 5 MHz
0.4
0.6
0.4
0.6
0.4
0.6
t cyc
ø < 5 MHz
tEXH
Figure 7.6
tEXL
EXTAL
VCC × 0.5
tEXr
tEXf
Figure 7.6 External Clock Input Timing
Table 7.4 lists the external clock output stabilization delay time. Figure 7.7 shows the timing for
the external clock output stabilization delay time. The oscillator and duty correction circuit have
the function of regulating the waveform of the external clock input to the EXTAL pin. When the
specified clock signal is input to the EXTAL pin, internal clock signal output is confirmed after
the elapse of the external clock output stabilization delay time (t DEXT). As clock signal output is not
confirmed during the tDEXT period, the reset signal should be driven low and the reset state
maintained during this time.
153
Table 7.4
External Clock Output Stabilization Delay Time
Conditions: VCC = 2.7 to 5.5 V, AVCC = 2.7 to 5.5 V, VSS = AVSS = 0 V
Item
Symbol
Min
Max
Unit
Notes
External clock output stabilization
delay time
t DEXT*
500
—
µs
Figure 7.7
Note: * t DEXT includes a 10 tcyc RES pulse width (t RESW).
VCC
STBY
2.7 V
VIH
EXTAL
ø (internal and
external)
RES
tDEXT*
Note: * tDEXT includes a 10 tcyc RES pulse width (tRESW).
Figure 7.7 External Clock Output Stabilization Delay Time
7.3
Duty Adjustment Circuit
When the clock frequency is 5 MHz or above, the duty adjustment circuit adjusts the duty cycle of
the signal from the oscillator circuit to generate the system clock (ø).
7.4
Prescaler
The 1/2 frequency divider generates an on-chip supporting module clock (øP) from the system
clock (ø) according to the setting of the CKDBL bit. The prescaler divides the frequency of øP to
generate internal clock signals with frequencies from ø P/2 to øP/4096.
154
Section 8 I/O Ports
8.1
Overview
The H8/3318 has six 8-bit input/output ports, one 7-bit input/output port, one 3-bit input/output
port, and one 8-bit input port.
Table 8.1 lists the functions of each port in each operating mode. As table 8.1 indicates, the port
functions are multiplexed with other functions, and the pin functions differ depending on the
operating mode.
Each port has a data direction register (DDR) that controls input and output, and a data register
(DR) for storing output data. If bit manipulation instructions will be executed on the port data
direction registers, see “Notes on Bit Manipulation Instructions” in section 2.5.5, Bit
Manipulations.
Ports 1, 2, 3, 4, 6, and 9 can drive one TTL load and a 90-pF capacitive load. Ports 5 and 8 can
drive one TTL load and a 30-pF capacitive load. Ports 1 and 2 can drive LEDs (with 10-mA
current sink). Ports 1 to 6, 8, and 9 can drive a darlington transistor. Ports 1 to 3 have built-in
MOS pull-up transistors.
For block diagrams of the ports, see appendix C, I/O Port Block Diagrams.
155
Table 8.1
Port Functions
Expanded Modes
Single-Chip Mode
Mode 3
Port
Description
Port 1 • 8-bit I/O
port
Pins
P17/A 7/TP7 to
P10/A 0/TP0
• Input pullups
• Can drive
LEDs
Mode 1
Mode 2
A7 to A0
P17/A 7 to
Address output P10/A 0
(lower)
General input
when DDR = 0
(initial value)
PBI Disabled
(DPME = 0)
PBI Enabled
(DPME = 1)
P17/TP7 to P10/TP0
General input when DDR = 0
(initial value)
General output when DDR = 1
and NDER = 0
Address output TPC output when DDR = 1 and
(lower) when
NDER = 1
DDR = 1 and
NDER = 0
TPC output
when DDR = 1
and NDER = 1
Port 2 • 8-bit I/O
port
P27/A 15 /TP15 to
P20/A 8/TP8
• Input pullups
• Can drive
LEDs
A15 to A8
P27/A 15 to
Address output P20/A 8
(upper)
General input
when DDR = 0
and NDER = 0
(initial value)
P27/TP15 to P20/TP8
General input when DDR = 0
(initial value)
General output when DDR = 1
and NDER = 0
TPC output when DDR = 1 and
Address output NDER = 1
(upper) when
DDR = 1 and
NDER = 1
TPC output
when DDR = 1
and NDER = 1
Port 3 • 8-bit I/O
port
P37/D7/DDB7 to
P30/D0/DDB0
D7 to D0 data bus
P47/FTOB 1/XDDB7,
P46/FTOA 1/XDDB6
P47/FTOB 1/XDDB7 to
P40/TMCI0/XDDB0
• Input pullups
Port 4 • 8-bit I/O
port
P45/TMRI1/XDDB5,
P44/TMO1/XDDB4,
P43/TMCI1/XDDB3,
P42/TMRI0/XDDB2,
P41/TMO0/XDDB1,
P40/TMCI0/XDDB0
156
General input/output or timer
input/output (8-bit timer 0/1,
input/output (8-bit timer 0/1, 16bit free-running timer 1) (TMCI 0,
TMO0, TMRI0, TMCI1, TMO1,
TMRI 1, FTOA1, FTOB1) when
PBI is disabled (DPME = 0)
DPRAM data bus when PBI is
enabled (DPME = 1)
P37 to P30
DDB7 to DDB0
General input/
output
DPRAM data
bus
P47/FTOB 1, P46/FTOA 1
Free-running timer 1 output
(FTOA1, FTOB1) or general
input/output
P45/TMRI1, P44/TMO1,
P43/TMCI1, P42/TMRI0,
P41/TMO0, P40/TMCI0
8-bit timer 0/1 input/output
(TMCI0, TMO0, TMRI0, TMCI1,
TMO1, TMRI1) and general
input/output
Table 8.1
Port Functions (cont)
Expanded Modes
Single-Chip Mode
Mode 3
Port
Description
Pins
Mode 1
Mode 2
PBI Disabled
(DPME = 0)
PBI Enabled
(DPME = 1)
Port 5 • 3-bit I/O
port
P52/SCK 0,
P51/RxD0,
P50/TxD0
General input/output or serial communication interface 0
input/output (TxD0, RxD0, SCK0)
Port 6 • 8-bit I/O
port
P67/IRQ7/ETMO1,
P66/FTOB 0/IRQ6/
ETMRI1,
P65/FTID/ETMCI1,
P64/FTIC/ETMO0,
P63/FTIB/ETMRI 0,
P62/FTIA/FTI,
P61/FTOA 0,
P60/FTCI/ETMCI0
16-bit free-running timer 0
input/output (FTCI, FTOA0,
FTOB0, FTIA, FTIB, FTIC, FTID),
16-bit free-running timer 1 input
(FTCI, FTI), interrupt input (IRQ6,
IRQ7), and 8-bit general
input/output when PBI is
disabled (DPME = 0)
Port 7 • 8-bit I/O
port
P77/AN7 to P70/AN0
Analog input to A/D converter (AN 7 to AN0) and general input
Port 8 • 7-bit I/O
port
P86/SCK 1/IRQ5/XOE, Serial communication interface 1
P85/RxD1/IRQ4,
input/output (TxD1, RxD1, SCK1),
P84/TxD1/IRQ3/XWE interrupt input (IRQ3, IRQ4,
IRQ5), and general input/output
when PBI is disabled (DPME =
0)
16-bit free-running timer 0
input/output (FTCI, FTOA0,
FTOB0, FTIA, FTIB, FTIC, FTID),
16-bit free-running timer 1 input
(FTCI, FTI), interrupt input (IRQ6,
IRQ7), and 8-bit general
input/output
The above and 8-bit timer 0/1
input/output (ETMCI 0, ETMRI0,
ETMO0, ETMCI1, ETMRI1,
ETMO1) when PBI is enabled
(DPME = 1)
Serial communication interface 1
input/output (TxD1, RxD1, SCK1),
interrupt input (IRQ3, IRQ4,
IRQ5), and general input/output
XOE and XWE input, serial
communication interface 1 input
(RxD1), IRQ4 input, and general
input/output when PBI is enabled
(DPME = 1)
P83/WRQ/XRDY
General input/output when PBI is General input/
disabled (DPME = 0)
output
WRQ output
WRQ and XRDY output when
PBI is enabled (DPME = 1)
P82/RS2 to P8 0/RS0 General input/output when PBI is General input/
disabled (DPME = 0) RS2 to RS0 output
input when PBI is enabled
(DPME = 1)
RS2 to RS0
input
157
Table 8.1
Port Functions (cont)
Expanded Modes
Single-Chip Mode
Mode 3
Port
Description
Pins
Port 9 • 8-bit I/O port P97/WAIT/WE
P96/ø
Mode 1
Mode 2
PBI Disabled
(DPME = 0)
PBI Enabled
(DPME = 1)
WAIT input
General input/
output
WE input
System clock (ø) output
General input when DDR = 0
(initial value)
System clock (ø) output when
DDR = 1
P95/AS/RDY
AS output
P94/WR/OE
WR output
P93/RD/CS
RD output
P92/IRQ0,
P91/IRQ1/XCS
Interrupt input (IRQ0, IRQ1) or
IRQ0 and IRQ1 input, and
general input/output when PBI is general input/output
disabled (DPME = 0)
General input/
output
RDY output
OE input
CS input
IRQ0 input, general input/output,
and XCS input when PBI is
enabled (DPME = 1)
P90/IRQ2/ADTRG
158
External trigger input to A/D converter (ADTRG), IRQ2 input, and
general input/output
8.2
Port 1
8.2.1
Overview
Port 1 is an 8-bit input/output port that is multiplexed with the lower address output pins (A 7 to A0)
and TPC output pins (TP7 to TP0). Figure 8.1 shows the pin configuration of port 1. The pin
functions differ depending on the operating mode.
Port 1 has built-in, software-controllable MOS input pull-up transistors that can be used in modes
2 and 3.
Pins in port 1 can drive one TTL load and a 90-pF capacitive load. They can also drive LEDs and
darlington transistors.
159
Port 1
Port 1 pins
Pin
configuration
in mode 1
(expanded
mode with
on-chip ROM
disabled)
Pin
configuration
in mode 2
(expanded
mode with
on-chip ROM
enabled)
P17/A7/TP7
A7 (output)
A7 (output)/P17 (input)/TP7 (output)
P16/A6/TP6
A6 (output)
A6 (output)/P16 (input)/TP6 (output)
P15/A5/TP5
A5 (output)
A5 (output)/P15 (input)/TP5 (output)
P14/A4/TP4
A4 (output)
A4 (output)/P14 (input)/TP4 (output)
P13/A3/TP3
A3 (output)
A3 (output)/P13 (input)/TP3 (output)
P12/A2/TP2
A2 (output)
A2 (output)/P12 (input)/TP2 (output)
P11/A1/TP1
A1 (output)
A1 (output)/P11 (input)/TP1 (output)
P10/A0/TP0
A0 (output)
A0 (output)/P10 (input)/TP0 (output)
Pin configuration in mode 3
(single-chip mode)
P17 (input/output)/TP7 (output)
P16 (input/output)/TP6 (output)
P15 (input/output)/TP5 (output)
P14 (input/output)/TP4 (output)
P13 (input/output)/TP3 (output)
P12 (input/output)/TP2 (output)
P11 (input/output)/TP1 (output)
P10 (input/output)/TP0 (output)
Figure 8.1 Port 1 Pin Configuration
160
8.2.2
Register Configuration and Descriptions
Table 8.2 summarizes the port 1 registers.
Table 8.2
Port 1 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 1 data direction register
P1DDR
W
H'FF (mode 1)
H'FFB0
H'00 (modes 2 and 3)
Port 1 data register
P1DR
R/W
H'00
H'FFB2
Port 1 input pull-up control
register
P1PCR
R/W
H'00
H'FFAC
Port 1 Data Direction Register (P1DDR)
Bit
7
6
5
4
3
2
1
0
P17DDR P16DDR P15DDR P14DDR P13DDR P12DDR P11DDR P10DDR
Mode 1
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Modes 2 and 3
P1DDR controls the input/output direction of each pin in port 1.
• Mode 1
The P1DDR values are fixed at 1. Port 1 consists of lower address output pins. P1DDR values
cannot be modified and are always read as 1.
In hardware standby mode, the address bus is in the high-impedance state.
• Mode 2
A pin in port 1 is used for address output or TPC output if the corresponding P1DDR bit is set
to 1, and for general input if this bit is cleared to 0.
• Mode 3
A pin in port 1 is used for general output or TPC output if the corresponding P1DDR bit is set
to 1, and for general input if this bit is cleared to 0.
In modes 2 and 3, P1DDR is a write-only register. Read data is invalid. If read, all bits always read
1. P1DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby
mode it retains its existing values, so if a transition to software standby mode occurs while a
P1DDR bit is set to 1, the corresponding pin remains in the output state.
161
Port 1 Data Register (P1DR)
Bit
7
6
5
4
3
2
1
0
P17
P16
P15
P14
P13
P12
P11
P10
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P1DR is an 8-bit register that stores data for pins P17 to P10. When a P1DDR bit is set to 1, if port
1 is read, the value in P1DR is obtained directly, regardless of the actual pin state. When a P1DDR
bit is cleared to 0, if port 1 is read the pin state is obtained.
P1DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
Port 1 Input Pull-Up Control Register (P1PCR)
Bit
7
6
5
4
3
2
1
0
P17PCR
P16PCR
P15PCR
P14PCR
P13PCR
P12PCR
P11PCR
P10PCR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P1PCR is an 8-bit readable/writable register that controls the input pull-up transistors in port 1. If
a P1DDR bit is cleared to 0 (designating input) and the corresponding P1PCR bit is set to 1, the
input pull-up transistor is turned on.
P1PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
8.2.3
Pin Functions in Each Mode
Port 1 has different pin functions in different modes. A separate description for each mode is given
below.
162
Pin Functions in Mode 1: In mode 1 (expanded mode with on-chip ROM disabled), port 1 is
automatically used for lower address output (A7 to A0). Figure 8.2 shows the pin functions in mode
1.
A7 (output)
A6 (output)
A5 (output)
Port 1
A4 (output)
A3 (output)
A2 (output)
A1 (output)
A0 (output)
Figure 8.2 Pin Functions in Mode 1 (Port 1)
Mode 2: In mode 2 (expanded mode with on-chip ROM enabled), port 1 can provide lower
address output pins, TPC output pins, and general input pins. Each pin becomes a lower address
output pin or TPC output pin if its P1DDR bit is set to 1, and a general input pin if its P1DDR bit
is cleared to 0. Following a reset, all pins are input pins. To be used for address output or TPC
output, their P1DDR bits must be set to 1. Figure 8.3 shows the pin functions in mode 2.
Port 1
When P1DDR = 1
and NDER1 = 0
When P1DDR = 0
When P1DDR = 1
and NDER1 = 1
A7 (output)
P17 (input)
TP7 (output)
A6 (output)
P16 (input)
TP6 (output)
A5 (output)
P15 (input)
TP5 (output)
A4 (output)
P14 (input)
TP4 (output)
A3 (output)
P13 (input)
TP3 (output)
A2 (output)
P12 (input)
TP2 (output)
A1 (output)
P11 (input)
TP1 (output)
A0 (output)
P10 (input)
TP0 (output)
Figure 8.3 Pin Functions in Mode 2 (Port 1)
163
Mode 3: In mode 3 (single-chip mode), port 1 can provide TPC output pins and general
input/output pins. For general input/output, the input or output direction of each pin can be
selected individually. A pin becomes a general input pin when its P1DDR bit is cleared to 0. When
its P1DDR bit is set to 1, the pin becomes a general output pin if its NDER1 bit is cleared to 0, or
a TPC output pin if its NDER1 bit is set to 1. Figure 8.4 shows the pin functions in mode 2.
Port 1
When P1DDR = 0 (input),
or P1DDR = 1
and NDER1 = 0 (output)
When P1DDR = 1
and NDER1 = 1
P17 (input/output)
TP7 (output)
P16 (input/output)
TP6 (output)
P15 (input/output)
TP5 (output)
P14 (input/output)
TP4 (output)
P13 (input/output)
TP3 (output)
P12 (input/output)
TP2 (output)
P11 (input/output)
TP1 (output)
P10 (input/output)
TP0 (output)
Figure 8.4 Pin Functions in Mode 3 (Port 1)
8.2.4
Input Pull-Up Transistors
Port 1 has built-in programmable input pull-up transistors that are available in modes 2 and 3. The
pull-up for each bit can be turned on and off individually. To turn on an input pull-up in mode 2 or
3, set the corresponding P1PCR bit to 1 and clear the corresponding P1DDR bit to 0. P1PCR is
cleared to H'00 by a reset and in the hardware standby mode, turning all input pull-ups off. In
software standby mode, the previous state is maintained.
Table 8.3 indicates the states of the input pull-up transistors in each operating mode.
Table 8.3
States of Input Pull-Up Transistors (Port 1)
Mode
Reset
Hardware Standby
Software Standby
Other Operating Modes
1
Off
Off
Off
Off
2
Off
Off
On/off
On/off
3
Off
Off
On/off
On/off
Notes: Off:
The input pull-up transistor is always off.
On/off: The input pull-up transistor is on if P1PCR = 1 and P1DDR = 0, but off otherwise.
164
8.3
Port 2
8.3.1
Overview
Port 2 is an 8-bit input/output port that is multiplexed with the upper address output pins (A 15 to
A8) and TPC output pins (TP15 to TP8). Figure 8.5 shows the pin configuration of port 2. The pin
functions differ depending on the operating mode.
Port 2 has built-in, software-controllable MOS input pull-up transistors that can be used in modes
2 and 3.
Pins in port 2 can drive one TTL load and a 90-pF capacitive load. They can also drive LEDs and
darlington transistors.
165
Port 2
Port 2 pins
Pin
configuration
in mode 1
(expanded
mode with
on-chip ROM
disabled)
Pin
configuration
in mode 2
(expanded
mode with
on-chip ROM
enabled)
P27/A15/TP15
A15 (output)
A15 (output)/P27 (input)/TP15 (output)
P26/A14/TP14
A14 (output)
A14 (output)/P26 (input)/TP14 (output)
P25/A13/TP13
A13 (output)
A13 (output)/P25 (input)/TP13 (output)
P24/A12/TP12
A12 (output)
A12 (output)/P24 (input)/TP12 (output)
P23/A11/TP11
A11 (output)
A11 (output)/P23 (input)/TP11 (output)
P22/A10/TP10
A10 (output)
A10 (output)/P22 (input)/TP10 (output)
P21/A9/TP9
A9 (output)
A9 (output)/P21 (input)/TP9 (output)
P20/A8/TP8
A8 (output)
A8 (output)/P20 (input)/TP8 (output)
Pin configuration in mode 3
(single-chip mode)
P27 (input/output)/TP15 (output)
P26 (input/output)/TP14 (output)
P25 (input/output)/TP13 (output)
P24 (input/output)/TP12 (output)
P23 (input/output)/TP11 (output)
P22 (input/output)/TP10 (output)
P21 (input/output)/TP9 (output)
P20 (input/output)/TP8 (output)
Figure 8.5 Port 2 Pin Configuration
166
8.3.2
Register Configuration and Descriptions
Table 8.4 summarizes the port 2 registers.
Table 8.4
Port 2 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 2 data direction register
P2DDR
W
H'FF (mode 1)
H'FFB1
H'00 (modes 2 and 3)
Port 2 data register
P2DR
R/W
H'00
H'FFB3
Port 2 input pull-up control
register
P2PCR
R/W
H'00
H'FFAD
Port 2 Data Direction Register (P2DDR)
Bit
7
6
5
4
3
2
1
0
P27DDR P26DDR P25DDR P24DDR P23DDR P22DDR P21DDR P20DDR
Mode 1
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Modes 2 and 3
P2DDR controls the input/output direction of each pin in port 2.
• Mode 1
The P2DDR values are fixed at 1. Port 2 consists of upper address output pins. P2DDR values
cannot be modified and are always read as 1.
In hardware standby mode, the address bus is in the high-impedance state.
• Mode 2
A pin in port 2 is used for address output or TPC output if the corresponding P2DDR bit is set
to 1, and for general input if this bit is cleared to 0.
• Mode 3
A pin in port 2 is used for general output or TPC output if the corresponding P2DDR bit is set
to 1, and for general input if this bit is cleared to 0.
In modes 2 and 3, P2DDR is a write-only register. Read data is invalid. If read, all bits always read
1. P2DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby
mode it retains its existing values, so if a transition to software standby mode occurs while a
P2DDR bit is set to 1, the corresponding pin remains in the output state.
167
Port 2 Data Register (P2DR)
Bit
7
6
5
4
3
2
1
0
P27
P26
P25
P24
P23
P22
P21
P20
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P2DR is an 8-bit register that stores data for pins P27 to P20. When a P2DDR bit is set to 1, if port
2 is read, the value in P2DR is obtained directly, regardless of the actual pin state. When a P2DDR
bit is cleared to 0, if port 2 is read the pin state is obtained.
P2DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
Port 2 Input Pull-Up Control Register (P2PCR)
Bit
7
6
5
4
3
2
1
0
P27PCR
P26PCR
P25PCR
P24PCR
P23PCR
P22PCR
P21PCR
P20PCR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P2PCR is an 8-bit readable/writable register that controls the input pull-up transistors in port 2. If
a P2DDR bit is cleared to 0 (designating input) and the corresponding P2PCR bit is set to 1, the
input pull-up transistor is turned on.
P2PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
8.3.3
Pin Functions in Each Mode
Port 2 has different pin functions in different modes. A separate description for each mode is given
below.
168
Pin Functions in Mode 1: In mode 1 (expanded mode with on-chip ROM disabled), port 2 is
automatically used for upper address output (A15 to A8). Figure 8.6 shows the pin functions in
mode 1.
A15 (output)
A14 (output)
A13 (output)
Port 2
A12 (output)
A11 (output)
A10 (output)
A9 (output)
A8 (output)
Figure 8.6 Pin Functions in Mode 1 (Port 2)
Mode 2: In mode 2 (expanded mode with on-chip ROM enabled), port 2 can provide upper
address output pins, TPC output pins, and general input pins. Each pin becomes an upper address
output pin or TPC output pin if its P2DDR bit is set to 1, and a general input pin if its P2DDR bit
is cleared to 0. Following a reset, all pins are input pins. To be used for address output or TPC
output, their P2DDR bits must be set to 1. Figure 8.7 shows the pin functions in mode 2.
Port 2
When P2DDR = 1
and NDER2 = 0
When P2DDR = 0
When P2DDR = 1
and NDER2 = 1
A15 (output)
P27 (input)
TP15 (output)
A14 (output)
P26 (input)
TP14 (output)
A13 (output)
P25 (input)
TP13 (output)
A12 (output)
P24 (input)
TP12 (output)
A11 (output)
P23 (input)
TP11 (output)
A10 (output)
P22 (input)
TP10 (output)
A9 (output)
P21 (input)
TP9 (output)
A8 (output)
P20 (input)
TP8 (output)
Figure 8.7 Pin Functions in Mode 2 (Port 2)
169
Mode 3: In mode 3 (single-chip mode), port 2 can provide TPC output pins and general
input/output pins. For general input/output, the input or output direction of each pin can be
selected individually. A pin becomes a general input pin when its P2DDR bit is cleared to 0. When
its P2DDR bit is set to 1, the pin becomes a general output pin if its NDER2 bit is cleared to 0, or
a TPC output pin if its NDER2 bit is set to 1. Figure 8.8 shows the pin functions in mode 2.
Port 2
When P2DDR = 0 (input),
or P2DDR = 1
and NDER2 = 0 (output)
When P2DDR = 1
and NDER2 = 1
P27 (input/output)
TP15 (output)
P26 (input/output)
TP14 (output)
P25 (input/output)
TP13 (output)
P24 (input/output)
TP12 (output)
P23 (input/output)
TP11 (output)
P22 (input/output)
TP10 (output)
P21 (input/output)
TP9 (output)
P20 (input/output)
TP8 (output)
Figure 8.8 Pin Functions in Mode 3 (Port 2)
8.3.4
Input Pull-Up Transistors
Port 2 has built-in programmable input pull-up transistors that are available in modes 2 and 3. The
pull-up for each bit can be turned on and off individually. To turn on an input pull-up in mode 2 or
3, set the corresponding P2PCR bit to 1 and clear the corresponding P2DDR bit to 0. P2PCR is
cleared to H'00 by a reset and in the hardware standby mode, turning all input pull-ups off. In
software standby mode, the previous state is maintained.
Table 8.5 indicates the states of the input pull-up transistors in each operating mode.
Table 8.5
States of Input Pull-Up Transistors (Port 2)
Mode
Reset
Hardware Standby
Software Standby
Other Operating Modes
1
Off
Off
Off
Off
2
Off
Off
On/off
On/off
3
Off
Off
On/off
On/off
Notes: Off:
The input pull-up transistor is always off.
On/off: The input pull-up transistor is on if P2PCR = 1 and P2DDR = 0, but off otherwise.
170
8.4
Port 3
8.4.1
Overview
Port 3 is an 8-bit input/output port that is multiplexed with the data bus (D7 to D0) and DPRAM
data bus (DDB7 to DDB0). Figure 8.9 shows the pin configuration of port 3. The pin functions
differ depending on the operating mode.
Port 3 has built-in, software-controllable MOS input pull-up transistors that can be used in mode
3.
Pins in port 3 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor.
Port 3 pins
Port 3
Pin configuration in mode 1
(expanded mode with on-chip
ROM disabled) and mode 2
(expanded mode with on-chip
ROM enabled)
P37/D7/DDB7
D7 (input/output)
P36/D6/DDB6
D6 (input/output)
P35/D5/DDB5
D5 (input/output)
P34/D4/DDB4
D4 (input/output)
P33/D3/DDB3
D3 (input/output)
P32/D2/DDB2
D2 (input/output)
P31/D1/DDB1
D1 (input/output)
P30/D0/DDB0
D0 (input/output)
Pin configuration in mode 3
(single-chip mode)
P37 (input/output)/DDB7 (input/output)
P36 (input/output)/DDB6 (input/output)
P35 (input/output)/DDB5 (input/output)
P34 (input/output)/DDB4 (input/output)
P33 (input/output)/DDB3 (input/output)
P32 (input/output)/DDB2 (input/output)
P31 (input/output)/DDB1 (input/output)
P30 (input/output)/DDB0 (input/output)
Figure 8.9 Port 3 Pin Configuration
171
8.4.2
Register Configuration and Descriptions
Table 8.6 summarizes the port 3 registers.
Table 8.6
Port 3 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 3 data direction register
P3DDR
W
H'00
H'FFB4
Port 3 data register
P3DR
R/W
H'00
H'FFB6
Port 3 input pull-up control
register
P3PCR
R/W
H'00
H'FFAE
Port 3 Data Direction Register (P3DDR)—H'FFB4
Bit
7
6
5
4
3
2
1
0
P37DDR P36DDR P35DDR P34DDR P33DDR P32DDR P31DDR P30DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
P3DDR is an 8-bit register that controls the input/output direction of each pin in port 3. P3DDR is
a write-only register. Read data is invalid. If read, all bits always read 1.
• Modes 1 and 2
In mode 1 (expanded mode with on-chip ROM disabled) and mode 2 (expanded mode with onchip ROM enabled), the input/output directions designated by P3DDR are ignored. Port 3
automatically consists of the input/output pins of the 8-bit data bus (D7 to D0).
The data bus is in the high-impedance state during reset, and during hardware and software
standby.
• Mode 3
When the DPME bit is cleared to 0 in SYSCR, a pin in port 3 is used for general output if the
corresponding P3DDR bit is set to 1, and for general input if this bit is cleared to 0.
P3DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby
mode it retains its existing values, so if a transition to software standby mode occurs while a
P3DDR bit is set to 1, the corresponding pin remains in the output state.
When the DPME bit is set to 1 (slave mode), P3DDR is cleared to H'00 and port 3 consists of
input/output pins for the DPRAM data bus (DDB7 to DDB0). In software standby mode, the
DPRAM data bus is in the high-impedance state. A reset or entry to hardware standby mode
clears the DPME bit to 0 and initializes P3DDR to H'00.
172
Port 3 Data Register (P3DR)
Bit
7
6
5
4
3
2
1
0
P37
P36
P35
P34
P33
P32
P31
P30
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P3DR is an 8-bit register that stores data for pins P37 to P30. When a P3DDR bit is set to 1, if port
3 is read, the value in P3DR is obtained directly, regardless of the actual pin state. When a P3DDR
bit is cleared to 0, if port 3 is read the pin state is obtained.
P3DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
Port 3 Input Pull-Up Control Register (P3PCR)
Bit
7
6
5
4
3
2
1
0
P37PCR
P36PCR
P35PCR
P34PCR
P33PCR
P32PCR
P31PCR
P30PCR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PP3PCR is an 8-bit readable/writable register that controls the input pull-up transistors in port 3. If
a P3DDR bit is cleared to 0 (designating input) and the corresponding P3PCR bit is set to 1, the
input pull-up transistor is turned on.
P3PCR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
8.4.3
Pin Functions in Each Mode
Port 3 has different pin functions in different modes. A separate description for each mode is given
below.
173
Pin Functions in Modes 1 and 2: In mode 1 (expanded mode with on-chip ROM disabled) and
mode 2 (expanded mode with on-chip ROM enabled), port 3 is automatically used for the
input/output pins of the data bus (D7 to D0). Figure 8.10 shows the pin functions in modes 1 and 2.
Modes 1 and 2
D7 (input/output)
D6 (input/output)
D5 (input/output)
Port 3
D4 (input/output)
D3 (input/output)
D2 (input/output)
D1 (input/output)
D0 (input/output)
Figure 8.10 Pin Functions in Modes 1 and 2 (Port 3)
Mode 3: In mode 3 (single-chip mode), when the DPME bit is cleared to 0 in SYSCR, each pin
can be designated for general input or output. A pin becomes an output pin when its P3DDR bit is
set to 1, and an input pin when this bit is cleared to 0.
When the DPME bit is set to 1 (slave mode), port 3 becomes the DPRAM data bus (DDB7 to
DDB0). P3DR should be cleared to H'00. P3DDR is automatically cleared to H'00.
Figure 8.11 shows the pin functions in mode 3.
Port 3
When DPME = 0
When DPME = 1
P37 (input/output)
DDB7 (input/output)
P36 (input/output)
DDB6 (input/output)
P35 (input/output)
DDB5 (input/output)
P34 (input/output)
DDB4 (input/output)
P33 (input/output)
DDB3 (input/output)
P32 (input/output)
DDB2 (input/output)
P31 (input/output)
DDB1 (input/output)
P30 (input/output)
DDB0 (input/output)
Figure 8.11 Pin Functions in Mode 3 (Port 3)
174
8.4.4
Input Pull-Up Transistors
Port 3 has built-in programmable input pull-up transistors that are available in mode 3. The pull-up
for each bit can be turned on and off individually. To turn on an input pull-up in mode 3, clear bit
DPME of SYSCR and bit P3DDR to 0, then write 1 to P3PCR. When DPME is set to 1 (slave
mode), input pull-ups cannot be turned on. Input pull-ups are turned off after a reset and in
hardware standby mode.
Table 8.7 indicates the states of the input pull-up transistors in each operating mode.
Table 8.7
States of Input Pull-Up Transistors (Port 3)
Mode
Reset
Hardware Standby
Other Operating Modes
1
Off
Off
Off
2
Off
Off
Off
Off
Off
On/off
3
DPME = 0
DPME 1 (slave mode)
Off
Notes: Off:
The input pull-up transistor is always off.
On/off: The input pull-up transistor is on if P3DDR = 0 and P3PCR = 1, but off otherwise.
175
8.5
Port 4
8.5.1
Overview
Port 4 is an 8-bit input/output port that is multiplexed with the DPRAM data bus (XDDB7 to
XDDB0), with input/output pins (TMRI0, TMRI1, TMCI0, TMCI1, TMO0, TMO1) of 8-bit timers 0
and 1, and with output pins (FTOA1, FTOB 1) of 16-bit free running timer 1 (FRT1). Figure 8.12
shows the pin configuration of port 4. The pin functions differ depending on the operating mode.
Pins in port 4 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor.
Pin configuration in mode 1 (expanded mode with
on-chip ROM disabled) and mode 2 (expanded
mode with on-chip ROM enabled)
Port 4
Port 4 pins
When DPME = 0
When DPME = 1
P47/FTOB1/XDDB7
P47 (input/output)/FTOB1 (output)
XDDB7 (input/output)
P46/FTOA1/XDDB6
P46 (input/output)/FTOA1 (output)
XDDB6 (input/output)
P45/TMRI1/XDDB5
P45 (input/output)/TMRI1 (input)
XDDB5 (input/output)
P44/TMO1/XDDB4
P44 (input/output)/TMO1 (output)
XDDB4 (input/output)
P43/TMCI1/XDDB3
P43 (input/output)/TMCI1 (input)
XDDB3 (input/output)
P42/TMRI0/XDDB2
P42 (input/output)/TMRI0 (input)
XDDB2 (input/output)
P41/TMO0/XDDB1
P41 (input/output)/TMO0 (output)
XDDB1 (input/output)
P40/TMCI0/XDDB0
P40 (input/output)/TMCI0 (input)
XDDB0 (input/output)
Pin configuration in mode 3
(single-chip mode)
P47 (input/output)/FTOB1 (output)
P46 (input/output)/FTOA1 (output)
P45 (input/output)/TMRI1 (input)
P44 (input/output)/TMO1 (output)
P43 (input/output)/TMCI1 (input)
P42 (input/output)/TMRI0 (input)
P41 (input/output)/TMO0 (output)
P40 (input/output)/TMCI0 (input)
Figure 8.12 Port 4 Pin Configuration
176
8.5.2
Register Configuration and Descriptions
Table 8.8 summarizes the port 4 registers.
Table 8.8
Port 4 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 4 data direction register
P4DDR
W
H'00
H'FFB5
Port 4 data register
P4DR
R/W
H'00
H'FFB7
Port 4 Data Direction Register (P4DDR)
Bit
7
6
5
4
3
2
1
0
P47DDR P46DDR P45DDR P44DDR P43DDR P42DDR P41DDR P40DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
P4DDR is an 8-bit register that controls the input/output direction of each pin in port 4. A pin
functions as an output pin if the corresponding P4DDR bit is set to 1, and as an input pin if this bit
is cleared to 0.
P4DDR is a write-only register. Read data is invalid. If read, all bits always read 1.
P4DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its existing values, so if a transition to software standby mode occurs while a P4DDR bit
is set to 1, the corresponding pin remains in the output state.
If a transition to software standby mode occurs while port 4 is being used by an on-chip
supporting module (for example, for 8-bit timer output), the on-chip supporting module will be
initialized, so the pin will revert to general-purpose input/output, controlled by P4DDR and P4DR.
177
Port 4 Data Register (P4DR)
Bit
7
6
5
4
3
2
1
0
P47
P46
P45
P44
P43
P42
P41
P40
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P4DR is an 8-bit register that stores data for pins P47 to P40. When a P4DDR bit is set to 1, if port
4 is read, the value in P4DR is obtained directly, regardless of the actual pin state. When a P4DDR
bit is cleared to 0, if port 4 is read the pin state is obtained. This also applies to pins used by onchip supporting modules.
P4DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
8.5.3
Pin Functions in Each Mode
Port 4 has different pin functions in different modes. A separate description for each mode is given
below.
Pin Functions in Modes 1 and 2: In mode 1 (expanded mode with on-chip ROM disabled) and
mode 2 (expanded mode with on-chip ROM enabled), port 4 is multiplexed with the DPRAM data
bus, (XDDB 7 to XDDB0), with input/output pins (TMRI0, TMRI1, TMCI0, TMCI1, TMO0, TMO1)
of 8-bit timers 0 and 1, and with output pins (FTOA1, FTOB 1) of 16-bit free running timer 1
(FRT1). Table 8.9 indicates the pin functions in modes 1 and 2.
178
Table 8.9
Pin Functions in Modes 1 and 2
Pin
Pin Functions and Selection Method
P47/FTOB1/
XDDB7
Bit DPME in SYSCR, bit OEB in TCR of FRT1, and bit P47DDR select the pin
function as follows
DPME
0
OEB
P47DDR
Pin function
P46/FTOA1/
XDDB6
0
1
X
0
1
X
X
P47 input
P47 output
FTOB1 output
XDDB7
input/output
Bit DPME in SYSCR, bit OEA in TCR of FRT1, and bit P46DDR select the pin
function as follows
DPME
0
OEA
P46DDR
Pin function
P45/TMRI1/
XDDB5
1
1
0
1
X
0
1
X
X
P46 input
P46 output
FTOA1 output
XDDB6
input/output
Bit DPME in SYSCR and bit P45DDR select the pin function as follows
DPME
P45DDR
Pin function
0
1
0
1
X
P45 input
P45 output
XDDB5 input/output
TMRI1 input
TMRI1 input is usable when bits CCLR1 and CCLR0 are both set to 1 in TCR of
8-bit timer 1
P44/TMO1/
XDDB4
Bit DPME in SYSCR, bits OS3 to OS0 in TCSR of 8-bit timer 1, and bit P44DDR
select the pin function as follows
DPME
0
OS3 to OS0
P4DDR
Pin function
1
All 0
Not all 0
X
0
1
X
X
P44 input
P44 output
TMO1 output
XDDB4
input/output
X: 0 and 1 settings both give the same pin function.
179
Table 8.9
Pin Functions in Modes 1 and 2 (cont)
Pin
Pin Functions and Selection Method
P43/TMCI1/
XDDB3
Bit DPME in SYSCR and bit P43DDR select the pin function as follows
DPME
P43DDR
Pin function
0
1
0
1
P43 input
P43 output
X
XDDB3 input/output
TMCI1 output
TMCI1 input is usable when bits CKS2 to CKS0 in TCR of 8-bit timer 1 select an
external clock source
P42/TMRI0/
XDDB2
Bit DPME in SYSCR, bits CCLR1 and CCLR0 in TCR of 8-bit timer 0, and bit
P42DDR select the pin function as follows
DPME
P42DDR
Pin function
0
1
0
1
P42 input
P42 output
X
XDDB2 input/output
TMRI0 input
TMRI0 input is usable when bits CCLR1 and CCLR0 are both set to 1 in TCR of
8-bit timer 0
P41/TMO0/
XDDB1
Bit DPME in SYSCR, bits OS3 to OS0 in TCSR of 8-bit timer 0, and bit P41DDR
select the pin function as follows
DPME
0
OS3 to OS0
P41DDR
Pin function
P40/TMCI0/
XDDB0
1
All 0
Not all 0
X
0
1
X
X
P41 input
P41 output
TMO0 output
XDDB1
input/output
Bit DPME in SYSCR and bit P40DDR select the pin function as follows
DPME
P40DDR
Pin function
0
1
0
1
P40 input
P40 output
X
XDDB0 input/output
TMCI0 output
TMCI0 input is usable when bits CKS2 to CKS0 in TCR of 8-bit timer 0 select an
external clock source
X: 0 and 1 settings both give the same pin function.
180
Pin Functions in Mode 3: In mode 3 (single-chip mode), port 4 is multiplexed with input/output
pins (TMRI0, TMRI1, TMCI0, TMCI1, TMO0, TMO1) of 8-bit timers 0 and 1, and with output pins
(FTOA1, FTOB1) of 16-bit free running timer 1 (FRT1). Table 8.10 indicates the pin functions in
mode 3.
Table 8.10 Pin Functions in Mode 3
Pin
Pin Functions and Selection Method
P47/FTOB1
Bit OEB in TCR of FRT1 and bit P4 7DDR select the pin function as follows
OEB
P47DDR
Pin function
P46/FTOA1
0
1
0
1
X
P47 input
P47 output
FTOB1 output
Bit OEA in TCR of FRT1 and bit P4 6DDR select the pin function as follows
OEA
P46DDR
Pin function
0
1
0
1
X
P46 input
P46 output
FTOA1 output
0
1
P45 input
P45 output
P45/TMRI1
P45DDR
Pin function
TMRI1 input
TMRI1 input is usable when bits CCLR1 and CCLR0 are both set to 1 in TCR of
8-bit timer 1
P44/TMO1
Bits OS3 to OS0 in TCSR of 8-bit timer 1 and bit P4 4DDR select the pin function
as follows
OS3 to OS0
P44DDR
Pin function
All 0
Not all 0
0
1
X
P44 input
P44 output
TMO1 output
X: 0 and 1 settings both give the same pin function.
181
Table 8.10 Pin Functions in Mode 3 (cont)
Pin
Pin Functions and Selection Method
P43/TMCI1
P43DDR
Pin function
0
1
P43 input
P43 output
TMCI1 input
TMCI1 input is usable when bits CKS2 to CKS0 in TCR of 8-bit timer 1 select an
external clock source
P42/TMRI0
P42DDR
Pin function
0
1
P42 input
P42 output
TMRI0 input
TMRI0 input is usable when bits CCLR1 and CCLR0 are both set to 1 in TCR of
8-bit timer 0
P41/TMO0
Bits OS3 to OS0 in TCSR of 8-bit timer 0 and bit P4 1DDR select the pin function
as follows
OS3 to OS0
P41DDR
Pin function
All 0
Not all 0
0
1
X
P41 input
P41 output
TMO0 output
0
1
P40 input
P40 output
P40/TMCI0
P40DDR
Pin function
TMCI0 input
TMCI0 input is usable when bits CKS2 to CKS0 in TCR of 8-bit timer 0 select an
external clock source
X: 0 and 1 settings both give the same pin function.
182
8.6
Port 5
8.6.1
Overview
Port 5 is a 3-bit input/output port that is multiplexed with input/output pins (TxD 0, RxD0, SCK0) of
serial communication interface 0. The port 5 pin functions are the same in all operating modes.
Figure 8.13 shows the pin configuration of port 5.
Pins in port 5 can drive one TTL load and a 30-pF capacitive load. They can also drive a
darlington transistor.
Port 5 pins
P52 (input/output)/SCK0 (input/output)
Port 5
P51 (input/output)/RxD0 (input)
P50 (input/output)/TxD0 (output)
Figure 8.13 Port 5 Pin Configuration
8.6.2
Register Configuration and Descriptions
Table 8.11 summarizes the port 5 registers.
Table 8.11 Port 5 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 5 data direction register
P5DDR
W
H'F8
H'FFB8
Port 5 data register
P5DR
R/W
H'F8
H'FFBA
183
Port 5 Data Direction Register (P5DDR)
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
Initial value
1
1
1
1
1
0
0
0
Read/Write
—
—
—
—
—
R/W
R/W
R/W
P52DDR P51DDR P50DDR
P5DDR is an 8-bit register that controls the input/output direction of each pin in port 5. A pin
functions as an output pin if the corresponding P5DDR bit is set to 1, and as an input pin if this bit
is cleared to 0.
P5DDR is a write-only register. Read data is invalid. If read, all bits always read 1.
P5DDR is initialized to H'F8 by a reset and in hardware standby mode. In software standby mode
it retains its existing values, so if a transition to software standby mode occurs while a P5DDR bit
is set to 1, the corresponding pin remains in the output state.
If a transition to software standby mode occurs while port 5 is being used by the SCI, the SCI will
be initialized, so the pin will revert to general-purpose input/output, controlled by P5DDR and
P5DR.
Port 5 Data Register (P5DR)
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
P52
P51
P50
Initial value
1
1
1
1
1
0
0
0
Read/Write
—
—
—
—
—
R/W
R/W
R/W
P5DR is an 8-bit register that stores data for pins P52 to P50. Bits 7 to 3 are reserved. They cannot
be modified, and are always read as 1.
When a P5DDR bit is set to 1, if port 5 is read, the value in P5DR is obtained directly, regardless
of the actual pin state. When a P5DDR bit is cleared to 0, if port 5 is read the pin state is obtained.
This also applies to pins used as SCI pins.
P5DR is initialized to H'F8 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
184
8.6.3
Pin Functions in Each Mode
Port 5 has the same pin functions in each operating mode. All pins can also be used as SCI0
input/output pins. Table 8.12 indicates the pin functions of port 5.
Table 8.12 Pin Functions of Port 5
Pin
Pin Functions and Selection Method
P52/SCK0
Bit C/A in SMR of SCI0, bits CKE0 and CKE1 in SCR of SCI0, and bit P52DDR
select the pin function as follows
CKE1
0
C/A
0
CKE0
P52DDR
Pin function
P51/RxD0
0
1
—
1
—
—
0
1
—
—
—
P52
input
P52
output
SCK 0
output
SCK 0
output
SCK 0
input
Bit RE in SCR of SCI0 and bit P51DDR select the pin function as follows
RE
P51DDR
Pin function
P50/TxD0
1
0
1
0
1
—
P51 input
P51 output
RxD0 input
Bit TE in SCR of SCI0 and bit P50DDR select the pin function as follows
TE
P50DDR
Pin function
0
1
0
1
—
P50 input
P50 output
TxD0 output
185
8.7
Port 6
8.7.1
Overview
Port 6 is an 8-bit input/output port that is multiplexed with input/output pins (FTOA0, FTOB0,
FTIA to FTID, FTCI) of 16-bit free-running timer 0 (FRT0), with input pins (FTCI, FTI) of 16-bit
free running timer 1 (FRT1), with input/output pins (ETMCI0, ETMRI0. ETMO0, ETMCI1,
ETMRI1, ETMO1) of 8-bit timers 0 and 1, and with IRQ6 and IRQ7 input pins. The pin functions
of P62 and P61 are the same in all operating modes. The pin functions of P6 7 to P63 and P60 differ
depending on the operating mode. Figure 8.14 shows the pin configuration of port 6.
Pins in port 6 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington transistor.
Port 6
Port 6 pins
Pin configuration in mode 1 (expanded mode
with on-chip ROM disabled) and mode 2
(expanded mode with on-chip ROM enabled)
P67/IRQ7/ETMO1
P67 (input/output)/IRQ7 (input)/ETMO1 (output)
P66/FTOB0/IRQ6/ETMRI1
P66 (input/output)/FTOB0 (output)/IRQ6 (input)/ETMRI1 (input)
P65/FTID/ETMCI1
P65 (input/output)/FTID (input)/ETMCI1 (input)
P64/FTIC/ETMO0
P64 (input/output)/FTIC (input)/ETMO0 (output)
P63/FTIB/ETMRI0
P63 (input/output)/FTIB (input)/ETMRI0 (input)
P62/FTIA/FTI
P62 (input/output)/FTIA (input)/FTI (input)
P61/FTOA0
P61 (input/output)/FTOA0 (output)
P60/FTCI/ETMCI0
P60 (input/output)/FTCI (input)/ETMCI0 (input)
Pin configuration in mode 3 (single-chip mode)
P67 (input/output)/IRQ7 (input)
P66 (input/output)/IRQ6 (input)/FTOB0 (output)
P65 (input/output)/FTID (input)
P64 (input/output)/FTIC (input)
P63 (input/output)/FTIB (input)
P62 (input/output)/FTIA (input)/FTI (input)
P61 (input/output)/FTOA0 (output)
P60 (input/output)/FTCI (input)
Figure 8.14 Port 6 Pin Configuration
186
8.7.2
Register Configuration and Descriptions
Table 8.13 summarizes the port 6 registers.
Table 8.13 Port 6 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 6 data direction register
P6DDR
W
H'00
H'FFB9
Port 6 data register
P6DR
R/W
H'00
H'FFBB
Port 6 Data Direction Register (P6DDR)—H'FFB9
Bit
7
6
5
4
3
2
1
0
P67DDR P66DDR P65DDR P64DDR P63DDR P62DDR P61DDR P60DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
P6DDR is an 8-bit register that controls the input/output direction of each pin in port 6. A pin
functions as an output pin if the corresponding P6DDR bit is set to 1, and as an input pin if this bit
is cleared to 0.
P6DDR is a write-only register. Read data is invalid. If read, all bits always read 1.
P6DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its existing values, so if a transition to software standby mode occurs while a P6DDR bit
is set to 1, the corresponding pin remains in the output state.
If a transition to software standby mode occurs while port 6 is being used by an on-chip
supporting module (for example, for free-running timer output), the on-chip supporting module
will be initialized, so the pin will revert to general-purpose input/output, controlled by P6DDR and
P6DR.
187
Port 6 Data Register (P6DR)—H'FFBB
Bit
7
6
5
4
3
2
1
0
P67
P66
P65
P64
P63
P62
P61
P60
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P6DR is an 8-bit register that stores data for pins P67 to P60. When a P6DDR bit is set to 1, if port
6 is read, the value in P6DR is obtained directly, regardless of the actual pin state. When a P6DDR
bit is cleared to 0, if port 6 is read the pin state is obtained. This also applies to pins used as onchip supporting module pins.
P6DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
8.7.3
Pin Functions in Each Mode
Port 6 has different pin functions in different modes. A separate description for each mode is given
below.
Pin Functions in Modes 1 and 2: In mode 1 (expanded mode with on-chip ROM disabled) and
mode 2 (expanded mode with on-chip ROM enabled), port 6 is multiplexed with input/output pins
(FTCI, FTOA0, FTOB 0, FTIA, FTIB, FTIC, FTID) of 16-bit free-running timer 0 (FRT0), with
input pins (FTCI, FTI) of 16-bit free running timer 1 (FRT1), and with IRQ6 and IRQ7 input pins.
When the PBI is enabled (when DPME is 1), port 6 is also multiplexed with input/output pins
(ETMRI0, ETMRI1, ETMCI0, ETMCI1, ETMO0, ETMO1) of 8-bit timers 0 and 1. When the PBI is
disabled (DPME is 0), the input/output pins of 8-bit timers 0 and 1 are multiplexed with port 4.
Figure 8.15 and table 8.14 indicate the pin functions in modes 1 and 2.
188
When DPME = 0
P67 (input/output)/IRQ7 (input)
P66 (input/output)/FTOB0 (output)/IRQ6 (input)
P65 (input/output)/FTID (input)
Port 6
P64 (input/output)/FTIC (input)
P63 (input/output)/FTIB (input)
P62 (input/output)/FTIA (input)/FTI (input)
P61 (input/output)/FTOA0 (output)
P60 (input/output)/FTCI (input)
When DPME = 1
P67 (input/output)/IRQ7 (input)/ETMO1 (output)
P66 (input/output)/FTOB0 (output)/IRQ6 (input)/ETMRI1 (input)
P65 (input/output)/FTID (input)/ETMCI1 (input)
P64 (input/output)/FTIC (input)/ETMO0 (output)
P63 (input/output)/FTIB (input)/ETMRI0 (input)
P62 (input/output)/FTIA (input)/FTI (input)
P61 (input/output)/FTOA0 (output)
P60 (input/output)/FTCI (input)/ETMCI0 (input)
Figure 8.15 Pin Functions in Modes 1 and 2 (Port 6)
189
Table 8.14 Pin Functions in Modes 1 and 2
Pin
Pin Functions and Selection Method
P67/IRQ7/
ETMO1
Bit DPME in SYSCR, bits OS3 to OS0 in the timer control/status register (TCSR)
of 8-bit timer 1, and bit P67DDR select the pin function as follows
When bit DPME is 0
P67DDR
Pin function
0
1
P67 input
P67 output
IRQ7 input
When bit DPME is 1
OS3 to OS0
P67DDR
Pin function
All 0
Not all 0
0
1
X
P67 input
P67 output
ETMO1 output
IRQ7 input
IRQ7 input is usable when bit IERQ7E is set to 1 in IER
P66/FTOB0/
IRQ6/ETMRI1
Bit DPME in SYSCR, bit OEB in the timer output compare control register (TCR)
of FRT0, and bit P66DDR select the pin function as follows
When bit DPME is 0
OEB
P66DDR
Pin function
0
1
0
1
X
P66 input
P66 output
FTOB0 output
IRQ6 input
When bit DPME is 1
OEB
P66DDR
Pin function
0
1
0
1
X
P66 input
P66 output
FTOB0 output
IRQ6 input and ETMRI1 input
IRQ6 input is usable when bit IERQ6E is set to 1 in IER.
ETMRI1 input is usable when bits CCLR1 and CCLR0 are both set to 1 in TCR of
8-bit timer 1
X: 0 and 1 settings both give the same pin function.
190
Table 8.14 Pin Functions in Modes 1 and 2 (cont)
Pin
Pin Functions and Selection Method
P65/FTID/
ETMCI1
Bit DPME in SYSCR and bit P65DDR select the pin function as follows
When bit DPME is 0
P65DDR
Pin function
0
1
P65 input
P65 output
FTID input
When bit DPME is 1
P65DDR
Pin function
0
1
P65 input
P65 output
FTID input and ETMCI1 input
ETMCI1 input is usable when bits CKS2 to CKS0 in TCR of 8-bit timer 1 select
an external clock source
P64/FTIC/
ETMO0
Bit DPME in SYSCR, bits OS3 to OS0 in TCSR of 8-bit timer 0, and bit P64DDR
select the pin function as follows
When bit DPME is 0
P64DDR
Pin function
0
1
P64 input
P64 output
FTIC input
When bit DPME is 1
OS3 to OS0
P64DDR
Pin function
All 0
Not all 0
0
1
X
P64 input
P64 output
ETMO0 output
FTIC input
X: 0 and 1 settings both give the same pin function.
191
Table 8.14 Pin Functions in Modes 1 and 2 (cont)
Pin
Pin Functions and Selection Method
P63/FTIB/
ETMRI0
Bit DPME in SYSCR and bit P63DDR select the pin function as follows
When bit DPME is 0
P63DDR
Pin function
0
1
P63 input
P63 output
FTIB input
When bit DPME is 1
P63DDR
Pin function
0
1
P63 input
P63 output
FTIB input and ETMRI 0 input
ETMRI0 input is usable when bits CCLR1 and CCLR0 are both set to 1 in TCR of
8-bit timer 0
P62/FTIA/FTI
P62DDR
Pin function
0
1
P62 input
P62 output
FTIA input and FTI input
P61/FTOA0
Bit OEA in TOCR of FRT0 and bit P6 1DDR select the pin function as follows
OEA
P61DDR
Pin function
0
1
0
1
X
P61 input
P61 output
FTOA0 output
X: 0 and 1 settings both give the same pin function.
192
Table 8.14 Pin Functions in Modes 1 and 2 (cont)
Pin
Pin Functions and Selection Method
P60/FTCI/
ETMCI0
Bit DPME in SYSCR and bit P60DDR select the pin function as follows
When bit DPME is 0
P60DDR
Pin function
0
1
P60 input
P60 output
FTCI input
When bit DPME is 1
P60DDR
Pin function
0
1
P60 input
P60 output
FTCI input and ETMCI0 input
FTCI input is usable by either FRT0 or FRT1 when bits CKS2 to CKS0 in its
TCR select an external clock source
ETMCI0 input is usable when bits CKS2 to CKS0 in TCR of 8-bit timer 0 select
an external clock source
193
Pin Functions in Mode 3: In mode 3 (single-chip mode), port 6 is multiplexed with input/output
pins (FTCI, FTOA0, FTOB0, FTIA, FTIB, FTIC, FTID) of FRT0, with input pins (FTCI, FTI) of
FRT1, and with IRQ6 and IRQ7 input pins. Figure 8.16 and table 8.15 indicate the pin functions in
mode 3.
P67 (input/output)/IRQ7 (input)
P66 (input/output)/FTOB0 (output)/IRQ6 (input)
P65 (input/output)/FTID (input)
P64 (input/output)/FTIC (input)
Port 6
P63 (input/output)/FTIB (input)
P62 (input/output)/FTIA (input)/FTI (input)
P61 (input/output)/FTOA0 (output)
P60 (input/output)/FTCI (input)
Figure 8.16 Pin Functions in Mode 3 (Port 6)
Table 8.15 Pin Functions in Mode 3
Pin
Pin Functions and Selection Method
P67/IRQ7
P67DDR
Pin function
0
1
P67 input
P67 output
IRQ7 input
IRQ7 input is usable when bit IERQ7E is set to 1 in the IRQ enable register (IER)
P66/FTOB0/
IRQ6
Bit OEB in the timer output compare control register (TOCR) of FRT0 and bit
P66DDR select the pin function as follows
OEB
P66DDR
Pin function
0
1
0
1
X
P66 input
P66 output
FTOB0 output
IRQ6 input
IRQ6 input is usable when bit IERQ6E is set to 1 in IER
X: 0 and 1 settings both give the same pin function.
194
Table 8.15 Pin Functions in Mode 3 (cont)
Pin
Pin Functions and Selection Method
P65/FTID
P65DDR
Pin function
0
1
P65 input
P65 output
FTID input
P64/FTIC
P64DDR
Pin function
0
1
P64 input
P64 output
FTIC input
P63/FTIB
P63DDR
Pin function
0
1
P63 input
P63 output
FTIB input
P62/FTIA/FTI
P62DDR
Pin function
0
1
P62 input
P62 output
FTIA input and FTI input
P61/FTOA0
Bit OEA in TOCR of FRT0 and bit P6 1DDR select the pin function as follows
OEA
P61DDR
Pin function
0
1
0
1
X
P61 input
P61 output
FTOA0 output
0
1
P60 input
P60 output
P60/FTCI
P60DDR
Pin function
FTCI input
FTCI input is usable by either FRT0 or FRT1 when bits CKS2 to CKS0 in its
TCR select an external clock source
X: 0 and 1 settings both give the same pin function.
195
8.8
Port 7
8.8.1
Overview
Port 7 is an 8-bit input port that also provides the analog input pins for the A/D converter module.
The pin functions are the same in expanded and single-chip modes. Port 7 is an 8-bit input port
that also provides the analog input pins for the A/D converter module. The pin functions are the
same in all modes. Figure 8.17 shows the pin configuration of port 7.
Port 7 pins
P77 (input)/AN7 (input)
P76 (input)/AN6 (input)
P75 (input)/AN5 (input)
Port 7
P74 (input)/AN4 (input)
P73 (input)/AN3 (input)
P72 (input)/AN2 (input)
P71 (input)/AN1 (input)
P70 (input)/AN0 (input)
Figure 8.17 Port 7 Pin Configuration
196
8.8.2
Register Configuration and Descriptions
Table 8.16 summarizes the port 7 registers. Port 7 is an input port, so there is no data direction
register.
Table 8.16 Port 7 Register
Name
Abbreviation
Read/Write
Initial Value
Address
Port 7 data register
P7DR
R
Undetermined
H'FFBE
Port 7 Data Register (P7DR)
Bit
7
6
5
4
3
2
1
0
P77
P76
P75
P74
P73
P72
P71
P70
Initial value
*
*
*
*
*
*
*
*
Read/Write
R
R
R
R
R
R
R
R
Note: * Depends on the levels of pins P7 7 to P7 0.
When P7DR is read, the pin states are always read.
197
8.9
Port 8
8.9.1
Overview
Port 8 is a 7-bit input/output port that is multiplexed with dual-port RAM (DPRAM) input/output
pins (RS2 to RS0, XOE, XWE, WRQ, XRDY), with input/output pins (TxD1, RxD1, SCK1) of
serial communication interface 1, and with interrupt input pins (IRQ5 to IRQ3). The functions of
pins P85 and P82 to P80 are the same in all modes. The functions of pins P86, P84, and P83 differ
depending on the operating mode. Figure 8.18 shows the pin configuration of port 8.
Pins in port 8 can drive one TTL load and a 30-pF capacitive load. They can also drive a
darlington transistor.
Port 8
Port 8 pins
Pin configuration in mode 1 (expanded mode
with on-chip ROM disabled) and mode 2
(expanded mode with on-chip ROM enabled)
P86/SCK1/IRQ5/XOE
P86 (input/output)/SCK1 (input/output)/IRQ5 (input)/XOE (input)
P85/RxD1/IRQ4
P85 (input/output)/RxD1 (input)/IRQ4 (input)
P84/TxD1/IRQ3/XWE
P84 (input/output)/TxD1 (output)/IRQ3 (input)/XWE (input)
P83/WRQ/XRDY
P83 (input/output)/WRQ (output)/XRDY (output)
P82/RS2
P82 (input/output)/RS2 (input)
P81/RS1
P81 (input/output)/RS1 (input)
P80/RS0
P80 (input/output)/RS0 (input)
Pin configuration in mode 3 (single-chip mode)
P86 (input/output)/SCK1 (input/output)/IRQ5 (input)
P85 (input/output)/RxD1 (input)/IRQ4 (input)
P84 (input/output)/TxD1 (output)/IRQ3 (input)
P83 (input/output)/WRQ (output)
P82 (input/output)/RS2 (input)
P81 (input/output)/RS1 (input)
P80 (input/output)/RS0 (input)
Figure 8.18 Port 8 Pin Configuration
198
8.9.2
Register Configuration and Descriptions
Table 8.17 summarizes the port 8 registers.
Table 8.17 Port 8 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 8 data direction register
P8DDR
W
H'80
H'FFBD
Port 8 data register
P8DR
R/W
H'80
H'FFBF
Port 8 Data Direction Register (P8DDR)
Bit
7
—
6
5
4
3
2
1
0
P86DDR P85DDR P84DDR P83DDR P82DDR P81DDR P80DDR
Initial value
1
0
0
0
0
0
0
0
Read/Write
—
W
W
W
W
W
W
W
P8DDR is an 8-bit register that controls the input/output direction of each pin in port 8. A pin
functions as an output pin if the corresponding P8DDR bit is set to 1, and as an input pin if this bit
is cleared to 0.
P8DDR is a write-only register. Read data is invalid. If read, all bits always read 1. Bit 7 is a
reserved bit that always reads 1.
P8DDR is initialized by a reset and in hardware standby mode. The initial value is H'80. In
software standby mode P8DDR retains its existing values, so if a transition to software standby
mode occurs while a P8DDR bit is set to 1, the corresponding pin remains in the output state.
If a transition to software standby mode occurs while port 8 is being used by an on-chip
supporting module (for example, for SCI input/output), the on-chip supporting module will be
initialized, so the pin will revert to general-purpose input/output, controlled by P8DDR and P8DR.
Port 8 Data Register (P8DR)
Bit
7
6
5
4
3
2
1
0
—
P86
P85
P84
P83
P82
P81
P80
Initial value
1
0
0
0
0
0
0
0
Read/Write
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P8DR is an 8-bit register that stores data for pins P86 to P80. Bit 7 is a reserved bit that always
reads 1.
199
When a P8DDR bit is set to 1, if port 8 is read, the value in P8DR is obtained directly, regardless
of the actual pin state. When a P8DDR bit is cleared to 0, if port 8 is read the pin state is obtained.
This also applies to pins used by on-chip supporting modules.
P8DR is initialized to H'80 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
8.9.3
Pin Functions in Each Mode
Port 8 has different pin functions in different modes. A separate description for each mode is given
below.
Pin Functions in Modes 1 and 2: In mode 1 (expanded mode with on-chip ROM disabled) and
mode 2 (expanded mode with on-chip ROM enabled), port 8 is multiplexed with dual-port RAM
(DPRAM) input/output pins (RS2 to RS0, XOE, XWE, WRQ, XRDY), with input/output pins
(TxD 1, RxD1, SCK1) of serial communication interface 1 (SCI1), and with interrupt input pins
(IRQ5 to IRQ3). Figure 8.19 and table 8.18 indicate the pin functions in modes 1 and 2.
When DPME = 0
P86 (input/output)/SCK1 (input/output)/IRQ5 (input)
P85 (input/output)/RxD1 (input)/IRQ4 (input)
P84 (input/output)/TxD1 (output)/IRQ3 (input)
Port 8
P83 (input/output)
P82 (input/output)
P81 (input/output)
P80 (input/output)
When DPME = 1
XOE (input)
P85 (input/output)/RxD1 (input)/IRQ4 (input)
XWE (input)
WRQ (output)/XRDY (output)
P82 (input/output)/RS2 (input)
P81 (input/output)/RS1 (input)
P80 (input/output)/RS0 (input)
Figure 8.19 Pin Functions in Modes 1 and 2 (Port 8)
200
Table 8.18 Pin Functions in Modes 1 and 2
Pin
Pin Functions and Selection Method
P86/SCK1/
IRQ5/XOE
Bit DPME in SYSCR, bit C/A in SMR of SCI1, bits CKE0 and CKE1 in SCR of
SCI1, and bit P8 6DDR select the pin function as follows
DPME
0
CKE1
1
0
C/A
1
X
1
X
X
1
X
X
X
0
CKE0
0
P86DDR
Pin
function
0
1
X
X
X
X
P86
input
P86
output
SCK 1
output
SCK 1
output
SCK 1
input
XOE
input
IRQ5 input
IRQ5 input is usable when bit IRQ5E is set to 1 in IER.
P85/RxD1/
IRQ4
Bit RE in SCR of SCI1 and bit P85DDR select the pin function as follows
RE
0
P85DDR
Pin function
1
0
1
X
P85 input
P85 output
RxD1 input
IRQ4 input
IRQ4 input is usable when bit IRQ4E is set to 1 in IER.
P84/TxD1/
IRQ3/XWE
Bit DPME in SYSCR, bit TE in SCR of SCI1, and bit P8 4DDR select the pin
function as follows
DPME
0
TE
P84DDR
Pin function
1
0
1
X
0
1
X
X
P84 input
P84 output
TxD1 output
XWE input
IRQ3 input
IRQ3 input is usable when bit IRQ3E is set to 1 in IER.
X: 0 and 1 settings both give the same pin function.
201
Table 8.18 Pin Functions in Modes 1 and 2 (cont)
Pin
Pin Functions and Selection Method
P83/WRQ/
XRDY
Bit DPME in SYSCR, bit EWRQ in PCCSR of the PBI, and bit P83DDR select
the pin function as follows
DPME
0
EWRQ
X
P83DDR
Pin function
P82/RS2
1
X
X
P83 input
P83 output
XRDY output
WRQ output
0
HSCE
X
1
1
0
0
1
0
1
X
P82 input
P82 output
P82 input
P82 output
RS 2 input
Bit DPME in SYSCR, bit HSCE in IOCR of the PBI, and bit P81DDR select the
pin function as follows
DPME
0
HSCE
X
P81DDR
Pin function
1
1
0
0
1
0
1
X
P81 input
P81 output
P81 input
P81 output
RS 1 input
Bit DPME in SYSCR, bit HSCE in IOCR of the PBI, and bit P80DDR select the
pin function as follows
DPME
0
HSCE
X
P80DDR
Pin function
1
1
0
0
1
0
1
X
P80 input
P80 output
P80 input
P80 output
RS 0 input
X: 0 and 1 settings both give the same pin function.
202
1
0
DPME
Pin function
P80/RS0
0
Bit DPME in SYSCR, bit HSCE in IOCR of the PBI, and bit P82DDR select the
pin function as follows
P82DDR
P81/RS1
1
Pin Functions in Mode 3: In mode 3 (single-chip mode), port 8 is multiplexed with dual-port
RAM (DPRAM) input/output pins (RS2 to RS0, WRQ), with input/output pins (TxD1, RxD1,
SCK1) of serial communication interface 1 (SCI1), and with interrupt input pins (IRQ5 to IRQ3).
Figure 8.20 and table 8.19 indicate the pin functions in mode 3.
When DPME = 0
P86 (input/output)/SCK1 (input/output)/IRQ5 (input)
P85 (input/output)/RxD1 (input)/IRQ4 (input)
P84 (input/output)/TxD1 (output)/IRQ3 (input)
Port 8
P83 (input/output)
P82 (input/output)
P81 (input/output)
P80 (input/output)
When DPME = 1
P86 (input/output)/SCK1 (input/output)/IRQ5 (input)
P85 (input/output)/RxD1 (input)/IRQ4 (input)
P84 (input/output)/TxD1 (output)/IRQ3 (input)
P83 (input/output)/WRQ (output)
P82 (input/output)/RS2 (input)
P81 (input/output)/RS1 (input)
P80 (input/output)/RS0 (input)
Figure 8.20 Pin Functions in Mode 3 (Port 8)
203
Table 8.19 Pin Functions in Mode 3
Pin
Pin Functions and Selection Method
P86/SCK1/
IRQ5
Bit C/A in SMR of SCI1, bits CKE0 and CKE1 in SCR of SCI1, and bit P86DDR
select the pin function as follows
CKE1
0
C/A
0
CKE0
P86DDR
Pin function
1
0
1
X
1
X
X
0
1
X
X
X
P86
input
P86
output
SCK 1
output
SCK 1
output
SCK 1
input
IRQ5 input
IRQ5 input is usable when bit IRQ5E is set to 1 in IER.
P85/RxD1/
IRQ4
Bit RE in SCR of SCI1 and bit P85DDR select the pin function as follows
RE
P85DDR
Pin function
0
1
0
1
X
P85 input
P85 output
RxD1 input
IRQ4 input
IRQ4 input is usable when bit IRQ4E is set to 1 in IER.
P84/TxD1/
IRQ3
Bit TE in SCR of SCI1 and bit P84DDR select the pin function as follows
TE
P84DDR
Pin function
0
1
0
1
X
P84 input
P84 output
TxD1 output
IRQ3 input
IRQ3 input is usable when bit IRQ3E is set to 1 in IER.
X: 0 and 1 settings both give the same pin function.
204
Table 8.19 Pin Functions in Mode 3 (cont)
Pin
Pin Functions and Selection Method
P83/WRQ
Bit DPME in SYSCR, bit EWRQ in PCCSR of the PBI, and bit P83DDR select
the pin function as follows
DPME
0
EWRQ
X
P83DDR
Pin function
P82/RS2
1
0
1
0
1
X
P83 input
P83 output
P83 input
P83 output
WRQ
output
DPME
0
HSCE
X
Pin function
1
1
0
0
1
0
1
X
P82 input
P82 output
P82 input
P82 output
RS 2 input
Bit DPME in SYSCR, bit HSCE in IOCR of the DTC, and bit P81DDR select the
pin function as follows
DPME
0
HSCE
X
P81DDR
Pin function
P80/RS0
0
Bit DPME in SYSCR, bit HSCE in IOCR of the PBI, and bit P82DDR select the
pin function as follows
P82DDR
P81/RS1
1
1
1
0
0
1
0
1
X
P81 input
P81 output
P81 input
P81 output
RS 1 input
Bit DPME in SYSCR, bit HSCE in IOCR of the PBI, and bit P80DDR select the
pin function as follows
DPME
0
HSCE
X
P80DDR
Pin function
1
1
0
0
1
0
1
X
P80 input
P80 output
P80 input
P80 output
RS 0 input
X: 0 and 1 settings both give the same pin function.
205
8.10
Port 9
8.10.1
Overview
Port 9 is an 8-bit input/output port that is multiplexed with interrupt input pins(IRQ0 to IRQ2),
input/output pins for bus control signals (RD, WR, AS, WAIT), input/output pins (CS, OE, RDY,
WE, XCS) for the dual-port RAM (DPRAM), an input pin (ADTRG) for the A/D converter, and
an output pin (ø) for the system clock. Pins P9 2 and P90 have the same functions in all modes. The
functions of pins P97 to P93 and P91 differ depending on the operating mode. Figure 8.21 shows
the pin configuration of port 9.
Pins in port 9 can drive one TTL load and a 90-pF capacitive load. They can also drive a
darlington pair.
Port 3
Port 9 pins
Pin configuration in mode 1 (expanded mode
with on-chip ROM disabled) and mode 2
(expanded mode with on-chip ROM enabled)
P97/WAIT/WE
WAIT (input)
P96/ø
ø (output)
P95/AS/RDY
AS (output)
P94/WR/OE
WR (output)
P93/RD/CS
RD (output)
P92/IRQ0
P92 (input/output)/IRQ0 (input)
P91/IRQ1/XCS
P91 (input/output)/IRQ1 (input)/XCS (input)
P90/IRQ2/ADTRG
P90 (input/output)/IRQ2 (input)/ADTRG (input)
Pin configuration in mode 3 (single-chip mode)
P97 (input/output)/WE (input)
P96 (input)/ø (output)
P95 (input/output)/RDY (output)
P94 (input/output)/OE (input)
P93 (input/output)/CS (input)
P92 (input/output)/IRQ0 (input)
P91 (input/output)/IRQ1 (input)
P90 (input/output)/IRQ2 (input)/ADTRG (input)
Figure 8.21 Port 9 Pin Configuration
206
8.10.2
Register Configuration and Descriptions
Table 8.20 summarizes the port 9 registers.
Table 8.20 Port 9 Registers
Name
Abbreviation
Read/Write
Initial Value
Address
Port 9 data direction register
P9DDR
W
H'40 (modes 1 and 2) H'FFC0
H'00 (mode 3)
Port 9 data register
P9DR
R/W*1
Undetermined* 2
H'FFC1
Notes: 1. Bit 6 is read-only.
2. Bit 6 is undetermined. Other bits are initially 0.
Port 9 Data Direction Register (P9DDR)
Bit
7
6
5
4
3
2
1
0
P97DDR P96DDR P95DDR P94DDR P93DDR P92DDR P91DDR P90DDR
Modes 1 and 2
Initial value
0
1
0
0
0
0
0
0
Read/Write
W
—
W
W
W
W
W
W
Mode 3
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
P9DDR is an 8-bit register that controls the input/output direction of each pin in port 9. A pin
functions as an output pin if the corresponding P9DDR bit is set to 1, and as an input pin if this bit
is cleared to 0. In modes 1 and 2, P96DDR is fixed at 1 and cannot be modified.
P9DDR is a write-only register. Read data is invalid. If read, all bits always read 1.
P9DDR is initialized by a reset and in hardware standby mode. The initial value is H'40 in modes
1 and 2, and H'00 in mode 3. In software standby mode P9DDR retains its existing values, so if a
transition to software standby mode occurs while a P9DDR bit is set to 1, the corresponding pin
remains in the output state.
207
Port 9 Data Register (P9DR)
Bit
7
6
5
4
3
2
1
0
P97
P96
P95
P94
P93
P92
P91
P90
Initial value
0
*
0
0
0
0
0
0
Read/Write
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
Note: * Determined by the level at pin P9 6.
P9DR is an 8-bit register that stores data for pins P97 to P90. When a P9DDR bit is set to 1, if port
9 is read, the value in P9DR is obtained directly, regardless of the actual pin state, except for P96.
When a P9DDR bit is cleared to 0, if port 9 is read the pin state is obtained. This also applies to
pins used by on-chip supporting modules and for bus control signals. P96 always returns the pin
state.
P9DR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode it
retains its existing values.
8.10.3
Pin Functions in Each Mode
Port 9 has one set of pin functions in modes 1 and 2, and a different set of pin functions in mode 3.
The pins are multiplexed with IRQ0 to IRQ2 input, bus control signal input/output, DPRAM
input/output, A/D converter input, and system clock (ø) output. Table 8.21 indicates the pin
functions of port 9.
208
Table 8.21 Port 9 Pin Functions
Pin
Pin Functions and Selection Method
P97/WE/WAIT
Bit DPME in SYSCR, bit P97DDR, and the operating mode select the pin
function as follows
Operating mode
X
P97DDR
X
0
1
X
WAIT input
P97 input
P97 output
WE input
0
1
Bit P96DDR and the operating mode select the pin function as follows
Operating mode
P95/RDY/AS
Mode 3
DPME
Pin function
P96/ø
Modes 1
and 2
Modes 1 and 2
Mode 3
P96DDR
Always 1
0
1
Pin function
ø output
P96 input
ø output
Bit DPME in SYSCR, bit P95DDR, and the operating mode select the pin
function as follows
Operating mode
Modes 1
and 2
Mode 3
DPME
X
P95DDR
X
0
1
X
AS output
P95 input
P95 output
RDY output*
Pin function
0
1
Note: * NMOS open-drain output. Connect an external pull-up resistor.
P94/OE/WR
Bit DPME in SYSCR, bit P94DDR, and the operating mode select the pin
function as follows
Operating mode
Modes 1
and 2
Mode 3
DPME
X
P94DDR
X
0
1
X
WR output
P94 input
P94 output
OE input
Pin function
0
1
X: 0 and 1 settings both give the same pin function.
209
Table 8.21 Port 9 Pin Functions (cont)
Pin
Pin Functions and Selection Method
P93/CS/RD
Bit DPME in SYSCR, bit HSCE in IOCR of the PBI, bit P9 3DDR, and the
operating mode select the pin function as follows
Operating mode
Modes 1
and 2
Mode 3
DPME
X
0
HSCE
X
X
P93DDR
X
0
1
0
1
X
RD
output
P93
input
P93
output
P93
input
P93
output
CS
input
Pin function
1
1
0
P92/IRQ0
P92DDR
Pin function
0
1
P92 input
P92 output
IRQ0 input
IRQ0 input can be used when bit IRQ0E is set to 1 in IER.
P91/IRQ1/
XCS
Bit DPME in SYSCR, bit P91DDR, and the operating mode select the pin
function as follows
Operating mode
Modes 1 and 2
DPME
P91DDR
Pin function
0
1
0
P91 input
Mode 3
1
X
P91 output XCS input
X
0
1
P91 input
P91 output
IRQ1 input
IRQ1 input
IRQ1 input can be used when bit IRQ1E is set to 1 in IER.
P90/IRQ2/
ADTRG
P90DDR
Pin function
0
1
P90 input
P90 output
IRQ2 input and ADTRG input
IRQ2 input can be used when bit IRQ2E is set to 1 in IER.
ADTRG input can be used when bit TRGE is set to 1 in ADCR.
X: 0 and 1 settings both give the same pin function.
210
8.11
Application Notes
8.11.1
Processing when Ports are Not Used
When a port is not used, designate it as an input port and pull each pin in the port either up or
down individually.
If a number of unused pins are pulled up or down with a single resistor, in the event of chip
malfunction the pins will go to the output state, possibly resulting in collisions between outputs.
211
Section 9 16-Bit Free-Running Timer 0
9.1
Overview
The H8/3318 has an on-chip 16-bit free-running timer (FRT) with two channels: FRT0 and FRT1.
Each channel is based on a 16-bit free-running counter (FRC) and can generate two independent
output waveforms, measure input pulse widths, or measure external clock periods.
This section describes FRT0. For FRT1, see section 10, 16-Bit Free-Running Timer 1.
The differences between FRT0 and FRT1 are that FRT0 has four input-capture lines and four
input-capture interrupt sources, and allows buffering to be designated. FRT1 has only one inputcapture line and one input-capture interrupt source, and does not support buffering.
9.1.1
Features
The features of FRT0 are listed below.
• Selection of four clock sources
The free-running counter can be driven by an internal clock source (øP/2, øP/8, or øP/32), or an
external clock input (enabling use as an external event counter).
• Two independent comparators
Each comparator can generate an independent waveform.
• Four input capture channels
The current count can be captured on the rising or falling edge (selectable) of an input signal.
The four input capture registers can be used separately, or in a buffer mode.
• Counter can be cleared under program control
The free-running counters can be cleared on compare-match A.
• Seven independent interrupts
Compare-match A and B, input capture A to D, and overflow interrupts are requested
independently.
213
9.1.2
Block Diagram
Figure 9.1 shows a block diagram of free-running timer 0.
Internal
clock sources
øP/2
øP/8
øP/32
External
clock source
FTCI
Clock select
Clock
OCRA (H/L)
Comparematch A
Comparator A
FTOA0
Overflow
FTOB0
Clear
Comparator B
OCRB (H/L)
Control
logic
Capture
FTIA
ICRA (H/L)
ICRB (H/L)
FTIB
Internal
data bus
Module data bus
Comparematch B
Bus interface
FRC (H/L)
ICRC (H/L)
FTIC
ICRD (H/L)
FTID
TCSR
TIER
TCR
TOCR
ICIA
ICIB
ICIC
ICID
OCIA
OCIB
FOVI
Legend
FRC:
OCRA, B:
ICRA, B, C, D:
TCSR:
Interrupt signals
Free-running counter (16 bits)
Output compare register A, B (16 bits)
Input capture register A, B, C, D (16 bits)
Timer control/status register (8 bits)
TIER: Timer interrupt enable register (8 bits)
TCR: Timer control register (8 bits)
TOCR: Timer output compare control
register (8 bits)
Figure 9.1 Block Diagram of 16-Bit Free-Running Timer 0
214
9.1.3
Input and Output Pins
Table 9.1 lists the input and output pins of free-running timer 0.
Table 9.1
FRT0 Input and Output Pins
Name
Abbreviation
I/O
Function
Counter clock input
FTCI
Input
Input of external free-running counter
clock signal
Output compare A
FTOA0*
Output
Output controlled by comparator A
Output compare B
FTOB0*
Output
Output controlled by comparator B
Input capture A
FTIA
Input
Trigger for capturing current count into
input capture register A
Input capture B
FTIB
Input
Trigger for capturing current count into
input capture register B
Input capture C
FTIC
Input
Trigger for capturing current count into
input capture register C
Input capture D
FTID
Input
Trigger for capturing current count into
input capture register D
Note: * In this manual, the channel subscripts are normally omitted.
215
9.1.4
Register Configuration
Table 9.2 lists the registers of free-running timer 0.
Table 9.2
Register Configuration
Name
Abbreviation
R/W
Timer interrupt enable register
TIER
R/W
1
Initial
Value
Address
H'01
H'FF90
H'00
H'FF91
Timer control/status register
TCSR
R/(W)*
Free-running counter (high)
FRC (H)
R/W
H'00
H'FF92
FRC (L)
R/W
H'00
H'FF93
OCRA/B (H)
R/W
H'FF
H'FF94* 2
Output compare register A/B (low)* 2
OCRA/B (L)
R/W
H'FF
H'FF95* 2
Timer control register
TCR
R/W
H'00
H'FF96
Timer output compare control register
TOCR
R/W
H'E0
H'FF97
Input capture register A (high)
ICRA (H)
R
H'00
H'FF98
Input capture register A (low)
ICRA (L)
R
H'00
H'FF99
Input capture register B (high)
ICRB (H)
R
H'00
H'FF9A
Input capture register B (low)
ICRB (L)
R
H'00
H'FF9B
Input capture register C (high)
ICRC (H)
R
H'00
H'FF9C
Input capture register C (low)
ICRC (L)
R
H'00
H'FF9D
Input capture register D (high)
ICRD (H)
R
H'00
H'FF9E
Input capture register D (low)
ICRD (L)
R
H'00
H'FF9F
Free-running counter (low)
Output compare register A/B (high)*
2
Notes: 1. Software can write a 0 to clear bits 7 to 1, but cannot write a 1 in these bits.
2. OCRA and OCRB share the same addresses. Access is controlled by the OCRS bit in
TOCR.
216
9.2
Register Descriptions
9.2.1
Free-Running Counter (FRC)
Bit
Initial value
Read/Write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
FRC is a 16-bit readable/writable up-counter that increments on an internal pulse generated from a
clock source. The clock source is selected by the clock select 1 and 0 bits (CKS1 and CKS0) of the
timer control register (TCR).
When FRC overflows from H'FFFF to H'0000, the overflow flag (OVF) in the timer control/status
register (TCSR) is set to 1.
Because FRC is a 16-bit register, a temporary register (TEMP) is used when FRC is written or
read. See section 9.3, CPU Interface, for details.
FRC is initialized to H'0000 by a reset and in the standby modes. It can also be cleared by
compare-match A.
217
9.2.2
Output Compare Registers A and B (OCRA and OCRB)
Bit
Initial value
Read/Write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
OCRA and OCRB are 16-bit readable/writable registers, the contents of which are continually
compared with the value in the FRC. When a match is detected, the corresponding output compare
flag (OCFA or OCFB) is set in the timer control/status register (TCSR).
In addition, if the output enable bit (OEA or OEB) in the timer output compare control register
(TOCR) is set to 1, when the output compare register and FRC values match, the logic level
selected by the output level bit (OLVLA or OLVLB) in TOCR is output at the output compare pin
(FTOA or FTOB). Following a reset, the FTOA and FTOB output levels are 0 until the first
compare-match.
Because OCRA and OCRB are 16-bit registers, a temporary register (TEMP) is used for write
access, as explained in section 9.3, CPU Interface.
OCRA and OCRB are initialized to H'FFFF by a reset and in the standby modes.
9.2.3
Input Capture Registers A to D (ICRA to ICRD)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Each input capture register is a 16-bit read-only register.
When the rising or falling edge of the signal at an input capture pin (FTIA to FTID) is detected,
the current FRC value is copied to the corresponding input capture register (ICRA to ICRD).* At
the same time, the corresponding input capture flag (ICFA to ICFD) in the timer control/status
register (TCSR) is set to 1. The input capture edge is selected by the input edge select bits
(IEDGA to IEDGD) in the timer control register (TCR).
Note: * The FRC contents are transferred to the input capture register regardless of the value of the
input capture flag (ICFA/B/C/D).
218
Input capture can be buffered by using the input capture registers in pairs. When the BUFEA bit in
TCR is set to 1, ICRC is used as a buffer register for ICRA as shown in figure 9.2. When an FTIA
input is received, the old ICRA contents are moved into ICRC, and the new FRC count is copied
into ICRA.
BUFEA
IEDGA IEDGC
FTIA
Edge detect and
capture signal
generating circuit
ICRC
BUFEA:
IEDGA:
IEDGC:
ICRC:
ICRA:
FRC:
ICRA
FRC
Buffer enable A
Input edge select A
Input edge select C
Input capture register C
Input capture register A
Free-running counter
Figure 9.2 Input Capture Buffering (Example)
Similarly, when the BUFEB bit in TCR is set to 1, ICRD is used as a buffer register for ICRB.
When input capture is buffered, if the two input edge bits are set to different values (IEDGA ≠
IEDGC or IEDGB ≠ IEDGD), then input capture is triggered on both the rising and falling edges
of the FTIA or FTIB input signal. If the two input edge bits are set to the same value (IEDGA =
IEDGC or IEDGB = IEDGD), then input capture is triggered on only one edge. See table 9.3.
Table 9.3
Buffered Input Capture Edge Selection (Example)
IEDGA
IEDGC
Input Capture Edge
0
0
Captured on falling edge of input capture A (FTIA)
1
Captured on both rising and falling edges of input capture A (FTIA)
1
(Initial value)
0
1
Captured on rising edge of input capture A (FTIA)
Because the input capture registers are 16-bit registers, a temporary register (TEMP) is used when
they are read. See section 9.3, CPU Interface, for details.
219
To ensure input capture, the width of the input capture pulse should be at least 1.5 system clock
periods (1.5·ø). When triggering is enabled on both edges, the input capture pulse width should be
at least 2.5 system clock periods.
The input capture registers are initialized to H'0000 by a reset and in the standby modes.
9.2.4
Timer Interrupt Enable Register (TIER)
Bit
7
6
5
4
3
2
1
0
ICIAE
ICIBE
ICICE
ICIDE
OCIAE
OCIBE
OVIE
—
Initial value
0
0
0
0
0
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
—
TIER is an 8-bit readable/writable register that enables and disables interrupts. TIER is initialized
to H'01 by a reset and in the standby modes.
Bit 7—Input Capture Interrupt A Enable (ICIAE): This bit selects whether to request input
capture interrupt A (ICIA) when input capture flag A (ICFA) in the timer status/control register
(TCSR) is set to 1.
Bit 7
ICIAE
Description
0
Input capture interrupt request A (ICIA) is disabled
1
Input capture interrupt request A (ICIA) is enabled
(Initial value)
Bit 6—Input Capture Interrupt B Enable (ICIBE): This bit selects whether to request input
capture interrupt B (ICIB) when input capture flag B (ICFB) in TCSR is set to 1.
Bit 6
ICIBE
Description
0
Input capture interrupt request B (ICIB) is disabled
1
Input capture interrupt request B (ICIB) is enabled
(Initial value)
Bit 5—Input Capture Interrupt C Enable (ICICE): This bit selects whether to request input
capture interrupt C (ICIC) when input capture flag C (ICFC) in TCSR is set to 1.
Bit 5
ICICE
Description
0
Input capture interrupt request C (ICIC) is disabled
1
Input capture interrupt request C (ICIC) is enabled
220
(Initial value)
Bit 4—Input Capture Interrupt D Enable (ICIDE): This bit selects whether to request input
capture interrupt D (ICID) when input capture flag D (ICFD) in TCSR is set to 1.
Bit 4
ICIDE
Description
0
Input capture interrupt request D (ICID) is disabled
1
Input capture interrupt request D (ICID) is enabled
(Initial value)
Bit 3—Output Compare Interrupt A Enable (OCIAE): This bit selects whether to request
output compare interrupt A (OCIA) when output compare flag A (OCFA) in TCSR is set to 1.
Bit 3
OCIAE
Description
0
Output compare interrupt request A (OCIA) is disabled
1
Output compare interrupt request A (OCIA) is enabled
(Initial value)
Bit 2—Output Compare Interrupt B Enable (OCIBE): This bit selects whether to request
output compare interrupt B (OCIB) when output compare flag B (OCFB) in TCSR is set to 1.
Bit 2
OCIBE
Description
0
Output compare interrupt request B (OCIB) is disabled
1
Output compare interrupt request B (OCIB) is enabled
(Initial value)
Bit 1—Timer Overflow Interrupt Enable (OVIE): This bit selects whether to request a freerunning timer overflow interrupt (FOVI) when the timer overflow flag (OVF) in TCSR is set to 1.
Bit 1
OVIE
Description
0
Timer overflow interrupt request (FOVI) is disabled
1
Timer overflow interrupt request (FOVI) is enabled
(Initial value)
Bit 0—Reserved: This bit cannot be modified and is always read as 1.
221
9.2.5
Timer Control/Status Register (TCSR)
Bit
7
6
5
4
3
2
1
0
ICFA
ICFB
ICFC
ICFD
OCFA
OCFB
OVF
CCLRA
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/W
Note: * Software can write 0 in bits 7 to 1 to clear the flags, but cannot write 1 in these bits.
TCSR is an 8-bit register that controls interrupt request signals and selects whether to clear the
counter. TCSR is initialized to H'00 by a reset and in the standby modes. Timing is described in
section 9.4, Operation.
Bit 7—Input Capture Flag A (ICFA): This status bit is set to 1 to flag an input capture A event.
If BUFEA = 0, ICFA indicates that the FRC value has been copied to ICRA. If BUFEA = 1, ICFA
indicates that the old ICRA value has been moved into ICRC and the new FRC value has been
copied to ICRA.
ICFA must be cleared by software. It is set by hardware, however, and cannot be set by software.
Bit 7
ICFA
Description
0
To clear ICFA, the CPU must read ICFA after it has been set to 1, then write a 0 in this
bit
(Initial value)
1
This bit is set to 1 when an FTIA input signal causes the FRC value to be copied to
ICRA
Bit 6—Input Capture Flag B (ICFB): This status bit is set to 1 to flag an input capture B event.
If BUFEB = 0, ICFB indicates that the FRC value has been copied to ICRB. If BUFEB = 1, ICFB
indicates that the old ICRB value has been moved into ICRD and the new FRC value has been
copied to ICRB.
ICFB must be cleared by software. It is set by hardware, however, and cannot be set by software.
Bit 6
ICFB
Description
0
To clear ICFB, the CPU must read ICFB after it has been set to 1, then write a 0 in this
bit
(Initial value)
1
This bit is set to 1 when an FTIB input signal causes the FRC value to be copied to
ICRB
222
Bit 5—Input Capture Flag C (ICFC): This status bit is set to 1 to flag input of a rising or falling
edge of FTIC as selected by the IEDGC bit. When BUFEA = 0, this indicates capture of the FRC
count in ICRC. When BUFEA = 1, however, the FRC count is not captured, so ICFC becomes
simply an external interrupt flag. In other words, the buffer mode frees FTIC for use as a generalpurpose interrupt signal (which can be enabled or disabled by the ICICE bit).
ICFC must be cleared by software. It is set by hardware, however, and cannot be set by software.
Bit 5
ICFC
Description
0
To clear ICFC, the CPU must read ICFC after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when an FTIC input signal is received
Bit 4—Input Capture Flag D (ICFD): This status bit is set to 1 to flag input of a rising or falling
edge of FTID as selected by the IEDGD bit. When BUFEB = 0, this indicates capture of the FRC
count in ICRD. When BUFEB = 1, however, the FRC count is not captured, so ICFD becomes
simply an external interrupt flag. In other words, the buffer mode frees FTID for use as a generalpurpose interrupt signal (which can be enabled or disabled by the ICIDE bit).
ICFD must be cleared by software. It is set by hardware, however, and cannot be set by software.
Bit 4
ICFD
Description
0
To clear ICFD, the CPU must read ICFD after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when an FTID input signal is received
Bit 3—Output Compare Flag A (OCFA): This status flag is set to 1 when the FRC value
matches the OCRA value. This flag must be cleared by software. It is set by hardware, however,
and cannot be set by software.
Bit 3
OCFA
Description
0
To clear OCFA, the CPU must read OCFA after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when FRC = OCRA
223
Bit 2—Output Compare Flag B (OCFB): This status flag is set to 1 when the FRC value
matches the OCRB value. This flag must be cleared by software. It is set by hardware, however,
and cannot be set by software.
Bit 2
OCFB
Description
0
To clear OCFB, the CPU must read OCFB after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when FRC = OCRB
Bit 1—Timer Overflow Flag (OVF): This status flag is set to 1 when FRC overflows (changes
from H'FFFF to H'0000). This flag must be cleared by software. It is set by hardware, however,
and cannot be set by software.
Bit 1
OVF
Description
0
To clear OVF, the CPU must read OVF after it has been set to 1, then write a 0 in this
bit
(Initial value)
1
This bit is set to 1 when FRC changes from H'FFFF to H'0000
Bit 0—Counter Clear A (CCLRA): This bit selects whether to clear FRC at compare-match A
(when the FRC and OCRA values match).
Bit 0
CCLRA
Description
0
The FRC is not cleared
1
The FRC is cleared at compare-match A
224
(Initial value)
9.2.6
Timer Control Register (TCR)
Bit
7
6
5
4
3
2
1
0
IEDGA
IEDGB
IEDGC
IEDGD
BUFEA
BUFEB
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TCR is an 8-bit readable/writable register that selects the rising or falling edge of the input capture
signals, enables the input capture buffer mode, and selects the FRC clock source.
TCR is initialized to H'00 by a reset and in the standby modes.
Bit 7—Input Edge Select A (IEDGA): This bit selects the rising or falling edge of the input
capture A signal (FTIA).
Bit 7
IEDGA
Description
0
Input capture A events are recognized on the falling edge of FTIA
1
Input capture A events are recognized on the rising edge of FTIA
(Initial value)
Bit 6—Input Edge Select B (IEDGB): This bit selects the rising or falling edge of the input
capture B signal (FTIB).
Bit 6
IEDGB
Description
0
Input capture B events are recognized on the falling edge of FTIB
1
Input capture B events are recognized on the rising edge of FTIB
(Initial value)
Bit 5—Input Edge Select C (IEDGC): This bit selects the rising or falling edge of the input
capture C signal (FTIC).
Bit 5
IEDGC
Description
0
Input capture C events are recognized on the falling edge of FTIC
1
Input capture C events are recognized on the rising edge of FTIC
(Initial value)
225
Bit 4—Input Edge Select D (IEDGD): This bit selects the rising or falling edge of the input
capture D signal (FTID).
Bit 4
IEDGD
Description
0
Input capture D events are recognized on the falling edge of FTID
1
Input capture D events are recognized on the rising edge of FTID
(Initial value)
Bit 3—Buffer Enable A (BUFEA): This bit selects whether to use ICRC as a buffer register for
ICRA.
Bit 3
BUFEA
Description
0
ICRC is used for input capture C
1
ICRC is used as a buffer register for input capture A
(Initial value)
Bit 2—Buffer Enable B (BUFEB): This bit selects whether to use ICRD as a buffer register for
ICRB.
Bit 2
BUFEB
Description
0
ICRD is used for input capture D
1
ICRD is used as a buffer register for input capture B
(Initial value)
Bits 1 and 0—Clock Select (CKS1 and CKS0): These bits select external clock input or one of
three internal clock sources for FRC. External clock pulses are counted on the rising edge of
external clock input pin FTCI.
Bit 1
CKS1
Bit 0
CKS0
Description
0
0
øP/2 internal clock source
1
øP/8 internal clock source
0
øP/32 internal clock source
1
External clock source (rising edge)
1
226
(Initial value)
9.2.7
Timer Output Compare Control Register (TOCR)
Bit
7
6
5
4
3
2
1
0
—
—
—
OCRS
OEA
OEB
OLVLA
OLVLB
Initial value
1
1
1
0
0
0
0
0
Read/Write
—
—
—
R/W
R/W
R/W
R/W
R/W
TOCR is an 8-bit readable/writable register that enables output from the output compare pins,
selects the output levels, and switches access between output compare registers A and B.
TOCR is initialized to H'E0 by a reset and in the standby modes.
Bits 7 to 5—Reserved: These bits cannot be modified and are always read as 1.
Bit 4—Output Compare Register Select (OCRS): OCRA and OCRB share the same address.
When this address is accessed, the OCRS bit selects which register is accessed. This bit does not
affect the operation of OCRA or OCRB.
Bit 4
OCRS
Description
0
OCRA is selected
1
OCRB is selected
(Initial value)
Bit 3—Output Enable A (OEA): This bit enables or disables output of the output compare A
signal (FTOA).
Bit 3
OEA
Description
0
Output compare A output is disabled
1
Output compare A output is enabled
(Initial value)
Bit 2—Output Enable B (OEB): This bit enables or disables output of the output compare B
signal (FTOB).
Bit 2
OEB
Description
0
Output compare B output is disabled
1
Output compare B output is enabled
(Initial value)
227
Bit 1—Output Level A (OLVLA): This bit selects the logic level to be output at the FTOA pin
when the FRC and OCRA values match.
Bit 1
OLVLA
Description
0
A 0 logic level is output for compare-match A
1
A 1 logic level is output for compare-match A
(Initial value)
Bit 0—Output Level B (OLVLB): This bit selects the logic level to be output at the FTOB pin
when the FRC and OCRB values match.
Bit 0
OLVLB
Description
0
A 0 logic level is output for compare-match B
1
A 1 logic level is output for compare-match B
228
(Initial value)
9.3
CPU Interface
The free-running counter (FRC), output compare registers (OCRA and OCRB), and input capture
registers (ICRA to ICRD) are 16-bit registers, but they are connected to an 8-bit data bus. When
the CPU accesses these registers, to ensure that both bytes are written or read simultaneously, the
access is performed using an 8-bit temporary register (TEMP).
These registers are written and read as follows:
• Register Write
When the CPU writes to the upper byte, the byte of write data is placed in TEMP. Next, when
the CPU writes to the lower byte, this byte of data is combined with the byte in TEMP and all
16 bits are written in the register simultaneously.
• Register Read
When the CPU reads the upper byte, the upper byte of data is sent to the CPU and the lower
byte is placed in TEMP. When the CPU reads the lower byte, it receives the value in TEMP.
Programs that access these registers should normally use word access. Equivalently, they may
access first the upper byte, then the lower byte by two consecutive byte accesses. Data will not be
transferred correctly if the bytes are accessed in reverse order, or if only one byte is accessed.
Figure 9.3 shows the data flow when FRC is accessed. The other registers are accessed in the same
way. As an exception, when the CPU reads OCRA or OCRB, it reads both the upper and lower
bytes directly, without using TEMP.
Coding Examples
To write the contents of general register R0 to OCRA: MOV.W
To transfer the contents of ICRA to general register R0: MOV.W
R0, @OCRA
@ICRA, R0
229
Upper byte write
Module data bus
Bus
interface
CPU writes
data H'AA
TEMP
[H'AA]
FRCH
[
]
FRCL
[
]
Lower byte write
CPU writes
data H'55
Module data bus
Bus
interface
TEMP
[H'AA]
FRCH
[H'AA]
FRCL
[H'55]
Figure 9.3a Write Access to FRC (when CPU Writes H'AA55)
230
Upper byte read
Module data bus
Bus
interface
CPU reads
data H'AA
TEMP
[H'55]
FRCL
[H'55]
FRCH
[H'AA]
Lower byte read
CPU reads
data H'55
Module data bus
Bus
interface
TEMP
[H'55]
FRCH
[
]
FRCL
[
]
Figure 9.3b Read Access to FRC (when FRC Contains H'AA55)
231
9.4
Operation
9.4.1
FRC Incrementation Timing
FRC increments on a pulse generated once for each period of the selected (internal or external)
clock source. The clock source is selected by bits CKS0 and CKS1 in TCR.
Internal Clock: The internal clock sources (øP/2, øP/8, øP/32) are created from the system clock
(ø) by a prescaler. FRC increments on a pulse generated from the falling edge of the prescaler
output. See figure 9.4.
ø
Internal
clock
FRC clock
pulse
FRC
N–1
N
Figure 9.4 Increment Timing for Internal Clock Source
232
N+1
External Clock: If external clock input is selected, FRC increments on the rising edge of the
FTCI clock signal. Figure 9.5 shows the increment timing.
The pulse width of the external clock signal must be at least 1.5 system clock (ø) periods. The
counter will not increment correctly if the pulse width is shorter than 1.5 system clock periods.
ø
FTCI
FRC clock
pulse
FRC
N
N+1
Figure 9.5 Increment Timing for External Clock Source
233
9.4.2
Output Compare Timing
When a compare-match occurs, the logic level selected by the output level bit (OLVLA or
OLVLB) in TOCR is output at the output compare pin (FTOA or FTOB). Figure 9.6 shows the
timing of this operation for compare-match A.
ø
FRC
N
N+1
OCRA
N
N
N
Internal comparematch A signal
Clear*
OLVLA
FTOA0
Note: * Cleared by software
Figure 9.6 Timing of Output Compare A
234
N+1
9.4.3
FRC Clear Timing
If the CCLRA bit in TCSR is set to 1, FRC is cleared when compare-match A occurs. Figure 9.7
shows the timing of this operation.
ø
Internal comparematch A signal
FRC
N
H'0000
Figure 9.7 Clearing of FRC by Compare-Match A
9.4.4
Input Capture Timing
Input Capture Timing: An internal input capture signal is generated from the rising or falling
edge of the signal at the input capture pin FTIx (x = A, B, C, D), as selected by the corresponding
IEDGx bit in TCR. Figure 9.8 shows the usual input capture timing when the rising edge is
selected (IEDGx = 1).
ø
Input data
FTI pin
Internal input
capture signal
Figure 9.8 Input Capture Timing (Usual Case)
If the upper byte of ICRA/B/C/D is being read when the corresponding input capture signal
arrives, the internal input capture signal is delayed by one state. Figure 9.9 shows the timing for
this case.
235
Read cycle:
CPU reads upper byte of ICR
T1
T2
T3
ø
Input at FTI pin
Internal input
capture signal
Figure 9.9 Input Capture Timing (1-State Delay due to ICRA/B/C/D Read)
Buffered Input Capture Timing: ICRC and ICRD can operate as buffers for ICRA and ICRB.
Figure 9.10 shows how input capture operates when ICRA and ICRC are used in buffer mode and
IEDGA and IEDGC are set to different values (IEDGA = 0 and IEDGC = 1, or IEDGA = 1 and
IEDGC = 0), so that input capture is performed on both the rising and falling edges of FTIA.
ø
FTIA
Internal input
capture signal
FRC
n
ICRA
M
ICRC
m
n+1
N
N+1
n
n
N
M
M
n
Figure 9.10 Buffered Input Capture with Both Edges Selected
236
When ICRC or ICRD is used as a buffer register, its input capture flag is set by the selected
transition of its input capture signal. For example, if ICRC is used to buffer ICRA, when the edge
transition selected by the IEDGC bit occurs on the FTIC input capture line, ICFC will be set, and
if the ICIEC bit is set, an interrupt will be requested. The FRC value will not be transferred to
ICRC, however.
In buffered input capture, if the upper byte of either of the two registers to which data will be
transferred (ICRA and ICRC, or ICRB and ICRD) is being read when the input signal arrives,
input capture is delayed by one system clock (ø). Figure 9.11 shows the timing when BUFEA = 1.
Read cycle:
CPU reads upper byte of ICRA or ICRC
T1
T2
T3
ø
Input at
FTIA pin
Internal input
capture signal
Figure 9.11 Input Capture Timing (1-State Delay, Buffer Mode)
237
9.4.5
Timing of Input Capture Flag (ICF) Setting
The input capture flag ICFx (x = A, B, C, D) is set to 1 by the internal input capture signal. Figure
9.12 shows the timing of this operation.
ø
Internal input
capture signal
ICF
FRC
ICR
N
N
Figure 9.12 Setting of Input Capture Flag
238
9.4.6
Setting of Output Compare Flags A and B (OCFA and OCFB)
The output compare flags are set to “1” by an internal compare-match signal generated when the
FRC value matches the OCRA or OCRB value. This compare-match signal is generated at the last
state in which the two values match, just before FRC increments to a new value.
Accordingly, when the FRC and OCR values match, the compare-match signal is not generated
until the next period of the clock source. Figure 9.13 shows the timing of the setting of the output
compare flags.
ø
FRC
OCRA or OCRB
N
N+1
N
Internal comparematch signal
OCFA or OCFB
Figure 9.13 Setting of Output Compare Flags
239
9.4.7
Setting of FRC Overflow Flag (OVF)
The FRC overflow flag (OVF) is set to 1 when FRC overflows (changes from H'FFFF to H'0000).
Figure 9.14 shows the timing of this operation.
ø
FRC
H'FFFF
H'0000
Internal overflow
signal
OVF
Figure 9.14 Setting of Overflow Flag (OVF)
9.5
Interrupts
FRT0 can request seven interrupts: (three types): input capture A to D (ICIA, ICIB, ICIC, ICID),
output compare A and B (OCIA and OCIB), and overflow (FOVI). Each interrupt can be enabled
or disabled by an enable bit in TIER. Independent signals are sent to the interrupt controller for
each interrupt. Table 9.4 lists information about these interrupts.
Table 9.4
FRT0 Interrupts
Interrupt
Description
Priority
ICIA
Requested by ICFA
High
ICIB
Requested by ICFB
ICIC
Requested by ICFC
ICID
Requested by ICFD
OCIA
Requested by OCFA
OCIB
Requested by OCFB
FOVI
Requested by OVF
240
Low
9.6
Sample Application
In the example below, the free-running timer is used to generate two square-wave outputs with a
50% duty cycle and arbitrary phase relationship. The programming is as follows:
1. The CCLRA bit in TCSR is set to 1.
2. Each time a compare-match interrupt occurs, software inverts the corresponding output level
bit in TOCR (OLVLA or OLVLB).
FRC
H'FFFF
Clear counter
OCRA
OCRB
H'0000
FTOA
FTOB
Figure 9.15 Square-Wave Output (Example)
241
9.7
Application Notes
Application programmers should note that the following types of contention can occur in freerunning timer 0.
Contention between FRC Write and Clear: If an internal counter clear signal is generated
during the T3 state of a write cycle to the lower byte of the free-running counter, the clear signal
takes priority and the write is not performed.
Figure 9.16 shows this type of contention.
Write cycle:
CPU write to lower byte of FRC
T1
T2
T3
ø
Internal address
bus
FRC address
Internal write
signal
FRC clear signal
FRC
N
Figure 9.16 FRC Write-Clear Contention
242
H'0000
Contention between FRC Write and Increment: If an FRC increment pulse is generated during
the T3 state of a write cycle to the lower byte of the free-running counter, the write takes priority
and FRC is not incremented.
Figure 9.17 shows this type of contention.
Write cycle:
CPU write to lower byte of FRC
T1
T2
T3
ø
Internal address bus
FRC address
Internal write signal
FRC clock pulse
FRC
N
M
Write data
Figure 9.17 FRC Write-Increment Contention
243
Contention between OCR Write and Compare-Match: If a compare-match occurs during the
T3 state of a write cycle to the lower byte of OCRA or OCRB, the write takes priority and the
compare-match signal is inhibited.
Figure 9.18 shows this type of contention.
Write cycle:
CPU write to lower byte of OCRA or OCRB
T1
T2
T3
ø
Internal address bus
OCR address
Internal write signal
FRC
N
OCRA or OCRB
N
N+1
M
Write data
Compare-match
A or B signal
Inhibited
Figure 9.18 Contention between OCR Write and Compare-Match
244
Incrementation Caused by Changing of Internal Clock Source: When an internal clock source
is changed, the changeover may cause FRC to increment. This depends on the time at which the
clock select bits (CKS1 and CKS0) are rewritten, as shown in table 9.5.
The pulse that increments FRC is generated at the falling edge of the internal clock source. If
clock sources are changed when the old source is high and the new source is low, as in case
number 3 in table 9.5, the changeover generates a falling edge that triggers the FRC increment
clock pulse.
Switching between an internal and external clock source can also cause FRC to increment.
Table 9.5
Effect of Changing Internal Clock Sources
No.
Description
1
Low → low:
CKS1 and CKS0 are
rewritten while both
clock sources are low.
Timing
Old clock
source
New clock
source
FRC clock
pulse
FRC
N+1
N
CKS rewrite
2
Low → high:
CKS1 and CKS0 are
rewritten while old
clock source is low and
new clock source is high.
Old clock
source
New clock
source
FRC clock
pulse
FRC
N
N+1
N+2
CKS rewrite
245
Table 9.5
Effect of Changing Internal Clock Sources (cont)
No.
Description
3
High → low:
CKS1 and CKS0 are
rewritten while old
clock source is high and
new clock source is low.
Timing
Old clock
source
New clock
source
*
FRC clock
pulse
FRC
N
N+1
N+2
CKS rewrite
4
High → high:
CKS1 and CKS0 are
rewritten while both
clock sources are high.
Old clock
source
New clock
source
FRC clock
pulse
FRC
N
N+1
N+2
CKS rewrite
Note: * The switching of clock sources is regarded as a falling edge that increments FRC.
246
Section 10 16-Bit Free-Running Timer 1
10.1
Overview
The H8/3318 has an on-chip 16-bit free-running timer (FRT) with two channels: FRT0 and FRT1.
Each channel is based on a 16-bit free-running counter (FRC) and can generate two independent
output waveforms, measure input pulse widths, or measure external clock periods.
This section describes FRT1. For FRT0, see section 9, 16-Bit Free-Running Timer 0.
The differences between FRT0 and FRT1 are that FRT0 has four input-capture lines and four
input-capture interrupt sources, and allows buffering to be designated. FRT1 has only one inputcapture line and one input-capture interrupt source, and does not support buffering.
10.1.1
Features
The features of FRT1 are listed below.
• Selection of four clock sources
The free-running counter can be driven by an internal clock source (øP/2, øP/8, or øP/32), or an
external clock input (enabling use as an external event counter).
• Two independent comparators
Each comparator can generate an independent waveform.
• Input capture
The current count can be captured on the rising or falling edge (selectable) of an input signal.
• Counter can be cleared under program control
The free-running counter can be cleared on compare-match A.
• Four interrupt sources
Compare-match A and B, input capture, and overflow interrupts are requested independently.
247
10.1.2
Block Diagram
Figure 10.1 shows a block diagram of free-running timer 1.
Internal
clock sources
øP/2
øP/8
øP/32
FTCI
Clock select
Clock
Comparematch A
FTOA1
Overflow
FTOB1
Clear
OCRA (H/L)
Comparator A
FTI
Comparematch B
Control
logic
Comparator B
OCRB (H/L)
Capture
Module data bus
FRC (H/L)
Bus interface
External
clock source
ICR (H/L)
TCSR
TCR
ICI
OCIA
OCIB
FOVI
Interrupt signals
Legend
OCRA:
OCRB:
FRC:
ICR:
TCSR:
TCR:
Output compare register A
Output compare register B
Free-running counter
Input capture register
Timer control/status register
Timer control register
Figure 10.1 Block Diagram of 16-Bit Free-Running Timer 1
248
Internal
data bus
10.1.3
Input and Output Pins
Table 10.1 lists the input and output pins of free-running timer 1.
Table 10.1 FRT1 Input and Output Pins
Name
Abbreviation
I/O
Function
Counter clock input
FTCI
Input
Input of external free-running counter clock
signal
Output compare A
FTOA1*
Output
Output controlled by comparator A
Output compare B
FTOB1*
Output
Output controlled by comparator B
Input capture
FTI
Input
Input capture trigger
Note: * In this manual, the channel subscripts are normally omitted.
10.1.4
Register Configuration
Table 10.2 lists the registers of free-running timer 1.
Table 10.2 Register Configuration
Name
Abbreviation
R/W
Initial
Value
Address
Timer control register
TCR
R/W
H'00
H'FFA0
Timer control/status register
TCSR
R/(W)*
H'00
H'FFA1
Free-running counter (high)
FRC (H)
R/W
H'00
H'FFA2
Free-running counter (low)
FRC (L)
R/W
H'00
H'FFA3
Output compare register A (high)
OCRA (H)
R/W
H'FF
H'FFA4
Output compare register A (low)
OCRA (L)
R/W
H'FF
H'FFA5
Output compare register B (high)
OCRB (H)
R/W
H'FF
H'FFA6
Output compare register B (low)
OCRB (L)
R/W
H'FF
H'FFA7
Input capture register (high)
ICR (H)
R
H'00
H'FFA8
Input capture register (low)
ICR (L)
R
H'00
H'FFA9
Note: * Software can write a 0 to clear bits 7 to 4, but cannot write a 1 in these bits.
249
10.2
Register Descriptions
10.2.1
Free-Running Counter (FRC)
Bit
Initial value
Read/Write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
FRC is a 16-bit readable/writable up-counter that increments on an internal pulse generated from a
clock source. The clock source is selected by the clock select 1 and 0 bits (CKS1 and CKS0) of the
timer control register (TCR).
When FRC overflows from H'FFFF to H'0000, the overflow flag (OVF) in the timer control/status
register (TCSR) is set to 1.
Because FRC is a 16-bit register, a temporary register (TEMP) is used when the FRC is written or
read. See section 10.3, CPU Interface, for details.
FRC is initialized to H'0000 by a reset and in the standby modes. It can also be cleared by
compare-match A.
10.2.2
Output Compare Registers A and B (OCRA and OCRB)
Bit
Initial value
Read/Write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
OCRA and OCRB are 16-bit readable/writable registers, the contents of which are continually
compared with the value in FRC. When a match is detected, the corresponding output compare
flag (OCFA or OCFB) is set in the timer control/status register (TCSR).
In addition, if the output enable bit (OEA or OEB) in the timer control register (TCR) is set to 1,
when the output compare register and FRC values match, the logic level selected by the output
level bit (OLVLA or OLVLB) in TCSR is output at the output compare pin (FTOA1 or FTOB1).
Following a reset, the FTOA1 and FTOB1 output levels are 0 until the first compare-match.
Because OCRA and OCRB are 16-bit registers, a temporary register (TEMP) is used for write
access, as explained in section 10.3, CPU Interface.
OCRA and OCRB are initialized to H'FFFF by a reset and in the standby modes.
250
10.2.3
Input Capture Register (ICR)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
ICR is a 16-bit read-only register.
When the rising or falling edge of the signal at the input capture pin (FTI) is detected, the current
FRC value is copied to ICR. At the same time, the input capture flag (ICF) in the timer
control/status register (TCSR) is set to 1. The input capture edge is selected by the input edge
select bit (IEDG) in TCSR.
Because ICR is a 16-bit register, a temporary register (TEMP) is used when it is read. See Section
10.3, CPU Interface, for details.
To ensure input capture, the width of the input capture pulse should be at least 1.5 system clock
cycles (1.5·ø).
ICR is initialized to H'0000 by a reset and in the standby modes.
Note: When input capture is detected, the FRC value is transferred to ICR even if the input
capture flag is already set.
10.2.4
Timer Control Register (TCR)
Bit
7
6
5
4
3
2
1
0
ICIE
OCIBE
OCICE
OVIE
OEB
OEA
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TCR is an 8-bit readable/writable register that enables and disables output signals and interrupts,
and selects the timer clock source.
TCR is initialized to H'00 by a reset and in the standby modes.
251
Bit 7—Input Capture Interrupt Enable (ICIE): Selects whether to request an input capture
interrupt (ICI) when the input capture flag (ICF) in the timer status/control register (TCSR) is set
to 1.
Bit 7
ICIE
Description
0
Input capture interrupt request (ICI) is disabled
1
Input capture interrupt request (ICI) is enabled
(Initial value)
Bit 6—Output Compare Interrupt Enable B (OCIEB): Selects whether to request output
compare interrupt B (OCIB) when output compare flag B (OCFB) in TCSR is set to 1.
Bit 6
OCIEB
Description
0
Output compare interrupt request B (OCIB) is disabled
1
Output compare interrupt request B (OCIB) is enabled
(Initial value)
Bit 5—Output Compare Interrupt Enable A (OCIEA): Selects whether to request output
compare interrupt A (OCIA) when output compare flag A (OCFA) in TCSR is set to 1.
Bit 5
OCIEA
Description
0
Output compare interrupt request A (OCIA) is disabled
1
Output compare interrupt request A (OCIA) is enabled
(Initial value)
Bit 4—Timer Overflow Interrupt Enable (OVIE): Selects whether to request an overflow
interrupt (FOVI) when the timer overflow flag (OVF) in TCSR is set to 1.
Bit 4
OVIE
Description
0
Timer overflow interrupt request (FOVI) is disabled
1
Timer overflow interrupt request (FOVI) is enabled
(Initial value)
Bit 3—Output Enable B (OEB): Enables or disables output of the output compare B signal
(FTOB). If output compare B is enabled, the FTOB1 pin is driven to the level selected by OLVLB
in TCSR whenever the FRC value matches the value in output compare register B (OCRB).
252
Bit 3
OEB
Description
0
Output compare B output is disabled
1
Output compare B output is enabled
(Initial value)
Bit 2—Output Enable A (OEA): Enables or disables output of the output compare A signal
(FTOA). If output compare A is enabled, the FTOA pin is driven to the level selected by OLVLA
in the timer status/control register (TCSR) whenever the FRC value matches the value in output
compare register A (OCRA).
Bit 2
OEA
Description
0
Output compare A output is disabled
1
Output compare A output is enabled
(Initial value)
Bits 1 and 0—Clock Select (CKS1 and CKS0): These bits select external clock input or one of
three internal clock sources for the FRC. External clock pulses are counted on the rising edge of
external clock input pin FTCI.
Bit 1
CKS1
Bit 0
CKS0
Description
0
0
øP/2 internal clock source
1
øP/8 internal clock source
0
øP/32 internal clock source
1
External clock source (rising edge)
1
10.2.5
(Initial value)
Timer Control/Status Register (TCSR)
Bit
7
6
5
4
3
2
1
0
ICA
OCFB
OCFA
OVF
OLVLB
OLVLA
IEDG
CCLRA
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)
R/(W)
R/(W)
R/(W)
Note: * Software can write a 0 in bits 7 to 4 to clear the flags, but cannot write a 1 in these bits.
TCSR is an 8-bit readable and partially writable register that contains the four interrupt flags and
selects the output compare levels, input capture edge, and whether to clear the counter on
compare-match A.
TCSR is initialized to H'00 by a reset and in the standby modes.
253
Bit 7—Input Capture Flag (ICF): This status bit is set to 1 to flag an input capture event,
indicating that the FRC value has been copied to ICR.
ICF must be cleared by software. It is set by hardware, however, and cannot be set by software.
Bit 7
ICF
Description
0
To clear ICF, the CPU must read ICF after it has been set to 1, then write a 0 in this bit
(Initial value)
1
This bit is set to 1 when an input capture signal causes the FRC value to be copied to
the ICR
Bit 6—Output Compare Flag B (OCFB): This status flag is set to 1 when the FRC value
matches the OCRB value.
This flag must be cleared by software. It is set by hardware, however, and cannot be set by
software.
Bit 6
OCFB
Description
0
To clear OCFB, the CPU must read OCFB after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when FRC = OCRB
Bit 5—Output Compare Flag A (OCFA): This status flag is set to 1 when the FRC value
matches the OCRA value.
This flag must be cleared by software. It is set by hardware, however, and cannot be set by
software.
Bit 5
OCFA
Description
0
To clear OCFA, the CPU must read OCFA after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when FRC = OCRA
Bit 4—Timer Overflow Flag (OVF): This status flag is set to 1 when the FRC overflows
(changes from H'FFFF to H'0000).
This flag must be cleared by software. It is set by hardware, however, and cannot be set by
software.
254
Bit 4
OVF
Description
0
To clear OVF, the CPU must read OVF after it has been set to 1, then write a 0 in this
bit
(Initial value)
1
This bit is set to 1 when FRC changes from H'FFFF to H'0000
Bit 3—Output Level B (OLVLB): Selects the logic level output at the FTOB pin when the FRC
and OCRB values match.
Bit 3
OLVLB
Description
0
A 0 logic level is output for compare-match B
1
A 1 logic level is output for compare-match B
(Initial value)
Bit 2—Output Level A (OLVLA): Selects the logic level output at the FTOA pin when the FRC
and OCRA values match.
Bit 2
OLVLA
Description
0
A 0 logic level is output for compare-match A
1
A 1 logic level is output for compare-match A
(Initial value)
Bit 1—Input Edge Select (IEDG): Selects the rising or falling edge of the input capture signal
(FTI).
Bit 1
IEDG
Description
0
FRC contents are transferred to ICR on the falling edge of FTI
1
FRC contents are transferred to ICR on the rising edge of FTI
(Initial value)
Bit 0—Counter Clear A (CCLRA): Selects whether to clear FRC at compare-match A (when the
FRC and OCRA values match).
Bit 0
CCLRA
Description
0
The FRC is not cleared
1
The FRC is cleared at compare-match A
(Initial value)
255
10.3
CPU Interface
The free-running counter (FRC), output compare registers (OCRA and OCRB), and input capture
register (ICR) are 16-bit registers, but they are connected to an 8-bit data bus. When the CPU
accesses these registers, to ensure that both bytes are written or read simultaneously, the access is
performed using an 8-bit temporary register (TEMP).
These registers are written and read as follows:
• Register Write
When the CPU writes to the upper byte, the byte of write data is placed in TEMP. Next, when
the CPU writes to the lower byte, this byte of data is combined with the byte in TEMP and all
16 bits are written in the register simultaneously.
• Register Read
When the CPU reads the upper byte, the upper byte of data is sent to the CPU and the lower
byte is placed in TEMP. When the CPU reads the lower byte, it receives the value in TEMP.
Programs that access these registers should normally use word access. Equivalently, they may
access first the upper byte, then the lower byte by two consecutive byte accesses. Data will not be
transferred correctly if the bytes are accessed in reverse order, if only one byte is accessed.
Coding Examples
To write the contents of general register R0 to OCRA: MOV.W
To transfer the ICR contents to general register R0:
MOV.W
R0, @OCRA
@ICR, R0
Figure 10.2 shows the data flow when FRC is accessed. The other registers are accessed in the
same way. As an exception, when the CPU reads OCRA or OCRB, it reads both the upper and
lower bytes directly, without using TEMP.
256
Upper byte write
Module data bus
Bus
interface
CPU writes
data H'AA
TEMP
[H'AA]
FRCH
[
]
FRCL
[
]
Lower byte write
CPU writes
data H'55
Module data bus
Bus
interface
TEMP
[H'AA]
FRCH
[H'AA]
FRCL
[H'55]
Figure 10.2a Write Access to FRC (When CPU Writes H'AA55)
257
Upper byte read
Module data bus
Bus
interface
CPU writes
data H'AA
TEMP
[H'55]
FRCL
[H'55]
FRCH
[H'AA]
Lower byte read
CPU writes
data H'55
Module data bus
Bus
interface
TEMP
[H'55]
FRCH
[
]
FRCL
[
]
Figure 10.2b Read Access to FRC (When FRC Contains H'AA55)
258
10.4
Operation
10.4.1
FRC Incrementation Timing
FRC increments on a pulse generated once for each cycle of the selected (internal or external)
clock source.
Internal Clock Sources: Can be selected by the CKS1 and CKS0 bits in the TCR. Internal clock
sources are created by dividing the system clock (ø). Three internal clock sources are available:
øP/2, øP/8, and øP/32. Figure 10.3 shows the increment timing.
ø
Prescaler
output
FRC clock
pulse
FRC
N–1
N
N+1
Figure 10.3 Increment Timing for Internal Clock Source
259
External Clock Input: Can be selected by the CKS1 and CKS0 bits in the TCR. The FRC
increments on the rising edge of the FTCI clock signal. The pulse width of the external clock
signal must be at least 1.5 system clock (ø) cycles. The counter will not increment correctly if the
pulse width is shorter than this.
Figure 10.4 shows the increment timing.
ø
FTCI
FRC clock
pulse
FRC
N
N+1
Figure 10.4 Increment Timing for External Clock Source
260
10.4.2
Output Compare Timing
When a compare-match occurs, the logic level selected by the output level bit (OLVLA or
OLVLB) in the TCSR is output at the output compare pin (FTOA or FTOB). Figure 10.5 shows
the timing of this operation for compare-match A.
ø
Internal comparematch A signal
Clear*
OLVLA
FTOA
Note: * Cleared by software
Figure 10.5 Timing of Output Compare A
10.4.3
FRC Clear Timing
If the CCLRA bit in the TCSR is set to 1, the FRC is cleared when compare-match A occurs.
Figure 10.6 shows the timing of this operation.
ø
Internal comparematch A signal
FRC
N
H'0000
Figure 10.6 Clearing of FRC by Compare-Match A
261
10.4.4
Input Capture Timing
An internal input capture signal is generated from the rising or falling edge of the FTI input, as
selected by the IEDG bit in TCSR. Figure 10.7 shows the usual input capture timing when the
rising edge is selected (IEDG = 1).
ø
Input at FTI pin
Internal input
capture signal
Figure 10.7 Input Capture Timing (Usual Case)
If the upper byte of ICR is being read when the internal input capture signal should be generated,
the internal input capture signal is delayed by one state. Figure 10.8 shows the timing for this case.
ICR upper byte read cycle
T1
T2
T3
ø
Input at FTI pin
Internal input
capture signal
Figure 10.8 Input Capture Timing (1-State Delay Due to ICR Read)
262
10.4.5
Timing of Input Capture Flag (ICF) Setting
The input capture flag ICF is set to 1 by the internal input capture signal. The FRC contents are
transferred to ICR at the same time. Figure 10.9 shows the timing of this operation.
ø
Internal input
capture signal
ICF
N
FRC
ICR
N
Figure 10.9 Setting of Input Capture Flag
10.4.6
Setting of FRC Overflow Flag (OVF)
The FRC overflow flag (OVF) is set to 1 when FRC changes from H'FFFF to H'0000. Figure
10.10 shows the timing of this operation.
ø
FRC
H'FFFF
H'0000
Internal overflow
signal
OVF
Figure 10.10 Setting of Overflow Flag (OVF)
263
10.5
Interrupts
FRT1 can request four interrupts: input capture (ICI), output compare A and B (OCIA and OCIB),
and overflow (FOVI). Each interrupt can be enabled or disabled by an enable bit in TCR.
Independent signals are sent to the interrupt controller for each interrupt. Table 10.3 lists
information about these interrupts.
Table 10.3 FRT1 Interrupts
Interrupt
Description
Priority
ICI
Requested by ICF
High
OCIA
Requested by OCFA
OCIB
Requested by OCFB
FOVI
Requested by OVF
10.6
Low
Sample Application
In the example below, the free-running timer channel is used to generate two square-wave outputs
with a 50% duty cycle and arbitrary phase relationship. The programming is as follows:
1. The CCLRA bit in TCSR is set to 1.
2. Each time a compare-match interrupt occurs, software inverts the corresponding output level
bit in TCSR (OLVLA or OLVLB).
FRC
H'FFFF
Clear counter
OCRA
OCRB
H'0000
FTOA1
FTOB1
Figure 10.11 Square-Wave Output (Example)
264
10.7
Application Notes
Application programmers should note that the following types of contention can occur in freerunning timer 1.
Contention between FRC Write and Clear: If an internal counter clear signal is generated
during the T3 state of a write cycle to the lower byte of the free-running counter, the clear signal
takes priority and the write is not performed.
Figure 10.12 shows this type of contention.
FRC lower byte write cycle
T1
T2
T3
ø
Internal address
bus
FRC address
Internal write
signal
FRC clear signal
FRC
N
H'0000
Figure 10.12 FRC Write-Clear Contention
265
Contention between FRC Write and Increment: If an FRC increment pulse is generated during
the T3 state of a write cycle to the lower byte of the free-running counter, the write takes priority
and FRC is not incremented.
Figure 10.13 shows this type of contention.
FRC lower byte write cycle
T1
T2
T3
ø
Internal address bus
FRC address
Internal write signal
FRC clock pulse
FRC
N
M
Write data
Figure 10.13 FRC Write-Increment Contention
266
Contention between OCR Write and Compare-Match: If a compare-match occurs during the
T3 state of a write cycle to the lower byte of OCRA or OCRB, the write takes precedence and the
compare-match signal is inhibited.
Figure 10.14 shows this type of contention.
OCRA or OCRB lower byte write cycle
T1
T2
T3
ø
Internal address bus
OCR address
Internal write signal
FRC
N
OCRA or OCRB
N
N+1
M
Write data
Compare-match
A or B signal
Inhibited
Figure 10.14 Contention between OCR Write and Compare-Match
267
Incrementation Caused by Changing of Internal Clock Source: When an internal clock source
is changed, the changeover may cause FRC to increment. This depends on the time at which the
clock select bits (CKS1 and CKS0) are rewritten, as shown in table 10.4.
The pulse that increments FRC is generated at the falling edge of the internal clock source. If
clock sources are changed when the old source is high and the new source is low, as in case
number 3 in table 10.4, the changeover generates a falling edge that triggers the FRC increment
clock pulse.
Switching between an internal and external clock source can also cause FRC to increment.
Table 10.4 Effect of Changing Internal Clock Sources
No.
Description
1
Low → low:
CKS1 and CKS0 are
rewritten while both
clock sources are low.
Timing
Old clock
source
New clock
source
FRC clock
pulse
FRC
N+1
N
CKS rewrite
2
Low → high:
CKS1 and CKS0 are
rewritten while old
clock source is low and
new clock source is high.
Old clock
source
New clock
source
FRC clock
pulse
FRC
N
N+1
N+2
CKS rewrite
268
Table 10.4 Effect of Changing Internal Clock Sources (cont)
No.
Description
3
High → low:
CKS1 and CKS0 are
rewritten while old
clock source is high and
new clock source is low.
Timing
Old clock
source
New clock
source
*
FRC clock
pulse
FRC
N
N+1
N+2
CKS rewrite
4
High → high:
CKS1 and CKS0 are
rewritten while both
clock sources are high.
Old clock
source
New clock
source
FRC clock
pulse
FRC
N
N+1
N+2
CKS rewrite
Note: * The switching of clock sources is regarded as a falling edge that increments FRC.
269
Section 11 8-Bit Timers
11.1
Overview
The H8/3318 includes an 8-bit timer module with two channels (numbered 0 and 1). Each channel
has an 8-bit counter (TCNT) and two time constant registers (TCORA and TCORB) that are
constantly compared with the TCNT value to detect compare-match events. One of the many
applications of the 8-bit timer module is to generate a rectangular-wave output with an arbitrary
duty cycle.
11.1.1
Features
The features of the 8-bit timer module are listed below.
• Selection of seven clock sources
The counters can be driven by one of six internal clock signals or an external clock input
(enabling use as an external event counter).
• Selection of three ways to clear the counters
The counters can be cleared on compare-match A or B, or by an external reset signal.
• Timer output controlled by two time constants
The timer output signal in each channel is controlled by two independent time constants,
enabling the timer to generate output waveforms with an arbitrary duty cycle. PWM
waveforms with a duty cycle of 0 to 100% can easily be output by selecting PWM mode.
• Three independent interrupts
Compare-match A and B and overflow interrupts can be requested independently.
271
11.1.2
Block Diagram
Figure 11.1 shows a block diagram of one channel in the 8-bit timer module.
Internal
clock sources
External
clock source
Channel 0
øP/2
øP/8
øP/32
øP/64
øP/256
øP/1024
TMCI
Clock select
Channel 1
øP/2
øP/8
øP/64
øP/128
øP/1024
øP/2048
Clock
TCORA
Compare-match A
TMO
TCNT
Clear
Comparator B
Control
logic
Compare-match B
Module data bus
Overflow
TMRI
TCORB
TCSR
TCR
CMIA
CMIB
OVI
Interrupt signals
Legend
TCORA:
TCORB:
TCNT:
TCSR:
TCR:
Time constant register A (8 bits)
Time constant register B (8 bits)
Timer counter
Timer control status register (8 bits)
Timer control register (8 bits)
Figure 11.1 Block Diagram of 8-Bit Timer (1 Channel)
272
Bus interface
Comparator A
Internal
data bus
11.1.3
Input and Output Pins
Table 11.1 lists the input and output pins of the 8-bit timer.
Table 11.1 Input and Output Pins of 8-Bit Timer
Channel
Name
Abbr.*
I/O
Function
0
Timer output
TMO0
Output
Output controlled by compare-match
Timer clock input
TMCI0
Input
External clock source for the counter
Timer reset input
TMRI0
Input
External reset signal for the counter
Timer output
TMO1
Output
Output controlled by compare-match
Timer clock input
TMCI1
Input
External clock source for the counter
Timer reset input
TMRI1
Input
External reset signal for the counter
1
Note: * In this manual, the channel subscripts are normally omitted.
11.1.4
Register Configuration
Table 11.2 lists the registers of the 8-bit timer module.
Table 11.2 8-Bit Timer Registers
Channel
Name
Abbreviation
R/W
Initial Value
Address
0
Timer control register
TCR
R/W
H'00
H'FFC8
Timer control/status register
TCSR
R/(W)*
H'00
H'FFC9
Timer constant register A
TCORA
R/W
H'FF
H'FFCA
Timer constant register B
TCORB
R/W
H'FF
H'FFCB
Timer counter
TCNT
R/W
H'00
H'FFCC
Timer control register
TCR
R/W
H'00
H'FFD0
Timer control/status register
TCSR
R/(W)*
H'00
H'FFD1
Timer constant register A
TCORA
R/W
H'FF
H'FFD2
Timer constant register B
TCORB
R/W
H'FF
H'FFD3
Timer counter
TCNT
R/W
H'00
H'FFD4
Serial/timer control register
STCR
R/W
H'1C
H'FFC3
1
0 and 1
Note: * Software can write a 0 to clear bits 7 to 5, but cannot write a 1 in these bits.
273
11.2
Register Descriptions
11.2.1
Timer Counter (TCNT)
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Each timer counter (TCNT) is an 8-bit up-counter that increments on a pulse generated from an
internal or external clock source selected by clock select bits 2 to 0 (CKS2 to CKS0) of the timer
control register (TCR). The CPU can always read or write the timer counter.
The timer counter can be cleared by an external reset input or by an internal compare-match signal
generated at a compare-match event. Clock clear bits 1 and 0 (CCLR1 and CCLR0) of the timer
control register select the method of clearing.
When a timer counter overflows from H'FF to H'00, the overflow flag (OVF) in the timer
control/status register (TCSR) is set to 1.
The timer counters are initialized to H'00 by a reset and in the standby modes.
11.2.2
Time Constant Registers A and B (TCORA and TCORB)
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TCORA and TCORB are 8-bit readable/writable registers. The timer count is continually
compared with the constants written in these registers (except during the T3 state of a write cycle
to TCORA or TCORB). When a match is detected, the corresponding compare-match flag (CMFA
or CMFB) is set in the timer control/status register (TCSR).
The timer output signal is controlled by these compare-match signals as specified by output select
bits 3 to 0 (OS3 to OS0) in the timer control/status register (TCSR).
TCORA and TCORB are initialized to H'FF by a reset and in the standby modes.
274
11.2.3
Timer Control Register (TCR)
Bit
7
6
5
4
3
2
1
0
CMIEB
CMIEA
OVIE
CCLR1
CCLR0
CKS2
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TCR is an 8-bit readable/writable register that selects the clock source and the time at which the
timer counter is cleared, and enables interrupts.
TCR is initialized to H'00 by a reset and in the standby modes.
For timing diagrams, see section 11.3, Operation.
Bit 7—Compare-match Interrupt Enable B (CMIEB): This bit selects whether to request
compare-match interrupt B (CMIB) when compare-match flag B (CMFB) in the timer
control/status register (TCSR) is set to 1.
Bit 7
CMIEB
Description
0
Compare-match interrupt request B (CMIB) is disabled
1
Compare-match interrupt request B (CMIB) is enabled
(Initial value)
Bit 6—Compare-match Interrupt Enable A (CMIEA): This bit selects whether to request
compare-match interrupt A (CMIA) when compare-match flag A (CMFA) in TCSR is set to 1.
Bit 6
CMIEA
Description
0
Compare-match interrupt request A (CMIA) is disabled
1
Compare-match interrupt request A (CMIA) is enabled
(Initial value)
Bit 5—Timer Overflow Interrupt Enable (OVIE): This bit selects whether to request a timer
overflow interrupt (OVI) when the overflow flag (OVF) in TCSR is set to 1.
Bit 5
OVIE
Description
0
The timer overflow interrupt request (OVI) is disabled
1
The timer overflow interrupt request (OVI) is enabled
(Initial value)
275
Bits 4 and 3—Counter Clear 1 and 0 (CCLR1 and CCLR0): These bits select how the timer
counter is cleared: by compare-match A or B or by an external reset input (TMRI).
Bit 4
CCLR1
Bit 3
CCLR0
Description
0
0
Not cleared
1
Cleared on compare-match A
0
Cleared on compare-match B
1
Cleared on rising edge of external reset input signal
1
(Initial value)
Bits 2, 1, and 0—Clock Select (CKS2, CKS1, and CKS0): These bits and bits ICKS1 and
ICKS0 in the serial/timer control register (STCR) select the internal or external clock source for
the timer counter. Six internal clock sources, derived by prescaling the system clock, are available
for each timer channel. For internal clock sources the counter is incremented on the falling edge of
the internal clock. For an external clock source, these bits can select whether to increment the
counter on the rising or falling edge of the clock input (TMCI), or on both edges.
276
TCR
STCR
Channel
Bit 2 Bit 1 Bit 0
CKS2 CKS1 CKS0
Bit 1 Bit 0
ICKS1 ICKS0 Description
0
0
0
0
—
—
No clock source (timer stopped) (Initial value)
0
0
1
—
0
øP/8 internal clock, counted on falling edge
0
0
1
—
1
øP/2 internal clock, counted on falling edge
0
1
0
—
0
øP/64 internal clock, counted on falling edge
0
1
0
—
1
øP/32 internal clock, counted on falling edge
0
1
1
—
0
øP/1024 internal clock, counted on falling edge
0
1
1
—
1
øP/256 internal clock, counted on falling edge
1
0
0
—
—
No clock source (timer stopped)
1
0
1
—
—
External clock source, counted on rising edge
1
1
0
—
—
External clock source, counted on falling edge
1
1
1
—
—
External clock source, counted on both rising
and falling edges
0
0
0
—
—
No clock source (timer stopped) (Initial value)
0
0
1
0
—
øP/8 internal clock, counted on falling edge
0
0
1
1
—
øP/2 internal clock, counted on falling edge
0
1
0
0
—
øP/64 internal clock, counted on falling edge
0
1
0
1
—
øP/128 internal clock, counted on falling edge
0
1
1
0
—
øP/1024 internal clock, counted on falling edge
0
1
1
1
—
øP/2048 internal clock, counted on falling edge
1
0
0
—
—
No clock source (timer stopped)
1
0
1
—
—
External clock source, counted on rising edge
1
1
0
—
—
External clock source, counted on falling edge
1
1
1
—
—
External clock source, counted on both rising
and falling edges
1
277
11.2.4
Timer Control/Status Register (TCSR)
Bit
7
6
5
4
3
2
1
0
CMFB
CMFA
OVF
PWME
OS3
OS2
OS1
OS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W)*
R/(W)*
R/(W)*
R/W
R/W
R/W
R/W
R/W
Note: * Software can write a 0 in bits 7 to 5 to clear the flags, but cannot write a 1 in these bits.
TCSR is an 8-bit readable and partially writable register that indicates compare-match and
overflow status and selects the effect of compare-match events on the timer output signal.
TCSR is initialized to H'00 by a reset and in the standby modes.
Bit 7—Compare-Match Flag B (CMFB): This status flag is set to 1 when the timer count
matches the time constant set in TCORB. CMFB must be cleared by software. It is set by
hardware, however, and cannot be set by software.
Bit 7
CMFB
Description
0
To clear CMFB, the CPU must read CMFB after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when TCNT = TCORB
Bit 6—Compare-Match Flag A (CMFA): This status flag is set to 1 when the timer count
matches the time constant set in TCORA. CMFA must be cleared by software. It is set by
hardware, however, and cannot be set by software.
Bit 6
CMFA
Description
0
To clear CMFA, the CPU must read CMFA after it has been set to 1, then write a 0 in
this bit
(Initial value)
1
This bit is set to 1 when TCNT = TCORA
Bit 5—Timer Overflow Flag (OVF): This status flag is set to 1 when the timer count overflows
(changes from H'FF to H'00). OVF must be cleared by software. It is set by hardware, however,
and cannot be set by software.
278
Bit 5
OVF
Description
0
To clear OVF, the CPU must read OVF after it has been set to 1, then write a 0 in this
bit
(Initial value)
1
This bit is set to 1 when TCNT changes from H'FF to H'00
Bit 4—PWM Mode Enable (PWME): This bit selects PWM mode for the timer output.
Bit 4
PWME
Description
0
Normal timer mode
1
PWM mode
(Initial value)
In PWM mode, CCLR1 to CCLR0 and OS3 to OS0 must be set so that the timer output cycle is
determined by the contents of TCORA, and the timer output duty cycle by the contents of
TCORB. In this case, the timer output pulse cycle, pulse width, and duty cycle conform to the
following expressions. If TCORA < TCORB, the output is saturated at a 100% duty cycle.
When TCORB ≤ TCORA:
Timer output pulse cycle = selected internal clock cycle × (TCORA + 1)
Timer output pulse width = selected internal clock cycle × TCORB
Timer output duty cycle = TCORB / (TCORA + 1)
TCR
TCSR
PWM Output Mode
CCLR1
CCLR0
OS3
OS2
OS1
OS0
Direct output
(when the above timer pulse width is high)
0
1
0
1
1
0
Inverted output
(when the above timer pulse width is low)
0
1
1
0
0
1
In PWM mode, a buffer register is inserted between TCORB and the module data bus, and the
data written to TCORB is held in the buffer register until a TCORA compare-match occurs. This
makes it easy to obtain PWM output with no disruption of the waveform. As regards the timer
output specification made by OS3 to OS0, the priority of a change due to compare-match B is
higher. Care is required since the operation is different from that in the normal timer mode.
Bits 3 to 0—Output Select 3 to 0 (OS3 to OS0): These bits specify the effect of TCOR–TCNT
compare-match events on the timer output signal (TMO). Bits OS3 and OS2 control the effect of
compare-match B on the output level. Bits OS1 and OS0 control the effect of compare-match A on
the output level.
279
If compare-match A and B occur simultaneously, any conflict is resolved according to the
following priority order: toggle > 1 output > 0 output.
After a reset, the timer output is 0 until the first compare-match event.
When all four output select bits are cleared to 0 the timer output signal is disabled.
Bit 3
OS3
Bit 2
OS2
Description
0
0
No change when compare-match B occurs
1
Output changes to 0 when compare-match B occurs
0
Output changes to 1 when compare-match B occurs
1
Output inverts (toggles) when compare-match B occurs
Bit 1
OS1
Bit 0
OS0
Description
0
0
No change when compare-match A occurs
1
Output changes to 0 when compare-match A occurs
0
Output changes to 1 when compare-match A occurs
1
Output inverts (toggles) when compare-match A occurs
1
1
11.2.5
(Initial value)
(Initial value)
Serial/Timer Control Register (STCR)
Bit
7
6
5
4
3
2
1
0
RING
CMPF
CMPIE
LOAD
MARK
—
ICKS1
ICKS0
Initial value
0
0
0
1
1
1
0
0
Read/Write
R/W
R/(W)*
R/W
(W)
(W)
—
R/W
R/W
Note: * Software can write a 0 in bit 6 to clear the flags, but cannot write a 1 in this bit.
STCR is an 8-bit readable/writable register that controls the serial communication interface,
selects clock sources for the timer counters, and controls DTU channel B.
STCR is initialized to H'1C by a reset.
Bits 7 to 3—DTU Channel B Control: These bits control DTU channel B. For details, see
section 5, Data Transfer Unit.
Bit 2—Reserved: This bit cannot be modified, and is always read as 1.
280
Bits 1 and 0—Internal Clock Source Select 1 and 0 (ICKS1 and ICKS0): These bits and bits
CKS2 to CKS0 in the TCR select clock sources for the timer counters. For details, see section
11.2.3, Timer Control Register.
11.3
Operation
11.3.1
TCNT Incrementation Timing
The timer counter increments on a pulse generated once for each period of the selected (internal or
external) clock source.
Internal Clock: Internal clock sources are created from the system clock by a prescaler. The
counter increments on an internal TCNT clock pulse generated from the falling edge of the
prescaler output, as shown in figure 11.2. Bits CKS2 to CKS0 of TCR and bits ICKS1 and ICKS0
of STCR can select one of the six internal clocks.
ø
Internal
clock
TCNT clock
pulse
TCNT
N–1
N
N+1
Figure 11.2 Count Timing for Internal Clock Input
281
External Clock: If external clock input (TMCI) is selected, the timer counter can increment on
the rising edge, the falling edge, or both edges of the external clock signal. Figure 11.3 shows
incrementation on both edges of the external clock signal.
The external clock pulse width must be at least 1.5 system clock periods for incrementation on a
single edge, and at least 2.5 system clock periods for incrementation on both edges. The counter
will not increment correctly if the pulse width is shorter than these values.
ø
External clock
source TMCI
TCNT clock
pulse
TCNT
N–1
N
Figure 11.3 Count Timing for External Clock Input
282
N+1
11.3.2
Compare-Match Timing
Setting of Compare-Match Flags A and B (CMFA and CMFB): The compare-match flags are
set to 1 by an internal compare-match signal generated when the timer count matches the time
constant in TCORA or TCORB. The compare-match signal is generated at the last state in which
the match is true, just before the timer counter increments to a new value.
Accordingly, when the timer count matches one of the time constants, the compare-match signal is
not generated until the next period of the clock source. Figure 11.4 shows the timing of the setting
of the compare-match flags.
ø
TCNT
TCOR
N
N+1
N
Internal comparematch signal
CMF
Figure 11.4 Setting of Compare-Match Flags
283
Output Timing: When a compare-match event occurs, the timer output changes as specified by
the output select bits (OS3 to OS0) in TCSR. Depending on these bits, the output can remain the
same, change to 0, change to 1, or toggle.
Figure 11.5 shows the timing when the output is set to toggle on compare-match A.
ø
Internal comparematch A signal
Timer output
(TMO)
Figure 11.5 Timing of Timer Output
Timing of Compare-Match Clear: Depending on the CCLR1 and CCLR0 bits in TCR, the timer
counter can be cleared when compare-match A or B occurs. Figure 11.6 shows the timing of this
operation.
ø
Internal comparematch signal
TCNT
N
Figure 11.6 Timing of Compare-Match Clear
284
H'00
11.3.3
External Reset of TCNT
When the CCLR1 and CCLR0 bits in TCR are both set to 1, the timer counter is cleared on the
rising edge of an external reset input. Figure 11.7 shows the timing of this operation. The timer
reset pulse width must be at least 1.5 system clock periods.
ø
External reset
input (TMRI)
Internal clear
pulse
TCNT
N–1
N
H'00
Figure 11.7 Timing of External Reset
11.3.4
Setting of TCSR Overflow Flag (OVF)
The overflow flag (OVF) is set to 1 when the timer count overflows (changes from H'FF to H'00).
Figure 11.8 shows the timing of this operation.
ø
TCNT
H'FF
H'00
Internal overflow
signal
OVF
Figure 11.8 Setting of Overflow Flag (OVF)
285
11.4
Interrupts
Each channel in the 8-bit timer can generate three types of interrupts: compare-match A and B
(CMIA and CMIB), and overflow (OVI). Each interrupt can be enabled or disabled by an enable
bit in TCR. Independent signals are sent to the interrupt controller for each interrupt. Table 11.3
lists information about these interrupts.
Table 11.3 8-Bit Timer Interrupts
Interrupt
Description
Priority
CMIA
Requested by CMFA
High
CMIB
Requested by CMFB
OVI
Requested by OVF
11.5
Low
Sample Application
In the example below, the 8-bit timer is used to generate a pulse output with a selected duty cycle.
The control bits are set as follows:
1. In TCR, CCLR1 is cleared to 0 and CCLR0 is set to 1 so that the timer counter is cleared when
its value matches the constant in TCORA.
2. In TCSR, bits OS3 to OS0 are set to 0110, causing the output to change to 1 on compare-match
A and to 0 on compare-match B.
With these settings, the 8-bit timer provides output of pulses at a rate determined by TCORA with
a pulse width determined by TCORB. No software intervention is required.
TCNT
H'FF
Clear counter
TCORA
TCORB
H'00
TMO pin
Figure 11.9 Example of Pulse Output
286
11.6
Application Notes
Application programmers should note that the following types of contention can occur in the 8-bit
timer.
11.6.1
Contention between TCNT Write and Clear
If an internal counter clear signal is generated during the T3 state of a write cycle to the timer
counter, the clear signal takes priority and the write is not performed.
Figure 11.10 shows this type of contention.
Write cycle: CPU writes to TCNT
T1
T2
T3
ø
Internal address
bus
TCNT address
Internal write
signal
Counter clear
signal
TCNT
N
H'00
Figure 11.10 TCNT Write-Clear Contention
287
11.6.2
Contention between TCNT Write and Increment
If a timer counter increment pulse is generated during the T3 state of a write cycle to the timer
counter, the write takes priority and the timer counter is not incremented.
Figure 11.11 shows this type of contention.
Write cycle: CPU writes to TCNT
T1
T2
T3
ø
Internal address bus
TCNT address
Internal write signal
TCNT clock pulse
TNCT
N
M
Write data
Figure 11.11 TCNT Write-Increment Contention
288
11.6.3
Contention between TCOR Write and Compare-Match
If a compare-match occurs during the T3 state of a write cycle to TCORA or TCORB, the write
takes priority and the compare-match signal is inhibited.
Figure 11.12 shows this type of contention.
Write cycle: CPU writes to TCORA or TCORB
T1
T2
T3
ø
Internal address bus
TCOR address
Internal write signal
TCNT
N
TCORA or TCORB
N
N+1
M
TCOR write data
Compare-match
A or B signal
Inhibited
Figure 11.12 Contention between TCOR Write and Compare-Match
289
11.6.4
Contention between Compare-Match A and Compare-Match B
If identical time constants are written in TCORA and TCORB, causing compare-match A and B to
occur simultaneously, any conflict between the output selections for compare-match A and B is
resolved by following the priority order in table 11.4.
Table 11.4 Priority of Timer Output
Output Selection
Priority
Toggle
High
1 output
0 output
No change
11.6.5
Low
Incrementation Caused by Changing of Internal Clock Source
When an internal clock source is changed, the changeover may cause the timer counter to
increment. This depends on the time at which the clock select bits (CKS1, CKS0) are rewritten, as
shown in table 11.5.
The pulse that increments the timer counter is generated at the falling edge of the internal clock
source signal. If clock sources are changed when the old source is high and the new source is low,
as in case number 3 in table 11.5, the changeover generates a falling edge that triggers the TCNT
clock pulse and increments the timer counter.
Switching between an internal and external clock source can also cause the timer counter to
increment.
290
Table 11.5 Effect of Changing Internal Clock Sources
No.
Description
1
Low → low* :
Clock select bits are
rewritten while both
clock sources are low.
Timing
1
Old clock
source
New clock
source
TCNT clock
pulse
TCNT
N+1
N
CKS rewrite
2
Low → high* 2:
Clock select bits are
rewritten while old
clock source is low and
new clock source is high.
Old clock
source
New clock
source
TCNT clock
pulse
TCNT
N
N+1
N+2
CKS rewrite
Notes: 1. Including a transition from low to the stopped state (CKS1 = 0, CKS0 = 0), or a
transition from the stopped state to low.
2. Including a transition from the stopped state to high.
291
Table 11.5 Effect of Changing Internal Clock Sources (cont)
No.
Description
Timing
3
High → low* :
Clock select bits are
rewritten while old
clock source is high and
new clock source is low.
3
Old clock
source
New clock
source
*4
TCNT clock
pulse
TCNT
N
N+1
N+2
CKS rewrite
4
High → high:
Clock select bits are
rewritten while both
clock sources are high.
Old clock
source
New clock
source
TCNT clock
pulse
TCNT
N
N+1
N+2
CKS rewrite
Notes: 3. Including a transition from high to the stopped state.
4. The switching of clock sources is regarded as a falling edge that increments TCNT.
292
Section 12 Programmable Timing Pattern Controller
12.1
Overview
The H8/3318 has a built-in programmable timing pattern controller (TPC) that provides pulse
outputs by using free-running timer 0 or 1 (FRT0 or FRT1) as a time base. The TPC pulse outputs
are divided into 4-bit groups (group 3 to group 0) that can operate simultaneously and
independently.
12.1.1
Features
The TPC has the following features:
• 16-bit output data
Maximum 16-bit data can be output. TPC output can be enabled on a bit-by-bit basis.
• Four output groups
Output trigger signals can be selected in 4-bit groups to provide up to four different 4-bit
outputs.
• Selectable output trigger signals
Output trigger signals can be selected for each group from the compare-match signals of FRT0
and FRT1.
• Non-overlap mode
A non-overlap margin can be provided between pulse outputs.
• Can operate together with the data transfer unit (DTU)
The compare-match signals selected as trigger signals can activate the DTU for sequential
output of data without CPU intervention.
293
12.1.2
Block Diagram
Figure 12.1 shows a block diagram of the TPC.
Control logic
TP15
TP14
TP13
TP12
TP11
TP10
TP9
TP8
TP7
TP6
TP5
TP4
TP3
TP2
TP1
TP0
P1DDR
P2DDR
NDER1
NDER2
TPMR
TPCR
Pulse output
pins, group 3
P2DR
NDRB
P1DR
NDRA
Pulse output
pins, group 2
Pulse output
pins, group 1
Pulse output
pins, group 0
Legend
TPMR:
TPCR:
NDER2:
NDER1:
P2DDR:
P1DDR:
NDRB:
NDRA:
P2DR:
P1DR:
TPC output mode register
TPC output control register
Next data enable register 2
Next data enable register 1
Port 2 data direction register
Port 1 data direction register
Next data register B
Next data register A
Port 2 data register
Port 1 data register
Figure 12.1 TPC Block Diagram
294
Internal data bus
FRT0 and FRT1 compare-match signals
12.1.3
TPC Pins
Table 12.1 summarizes the TPC output pins.
Table 12.1 TPC Pins
Name
Symbol
I/O
Function
TPC output 0
TP 0
Output
Group 0 pulse output
TPC output 1
TP 1
Output
TPC output 2
TP 2
Output
TPC output 3
TP 3
Output
TPC output 4
TP 4
Output
TPC output 5
TP 5
Output
TPC output 6
TP 6
Output
TPC output 7
TP 7
Output
TPC output 8
TP 8
Output
TPC output 9
TP 9
Output
TPC output 10
TP 10
Output
TPC output 11
TP 11
Output
TPC output 12
TP 12
Output
TPC output 13
TP 13
Output
TPC output 14
TP 14
Output
TPC output 15
TP 15
Output
Group 1 pulse output
Group 2 pulse output
Group 3 pulse output
295
12.1.4
Registers
Table 12.2 summarizes the TPC registers.
Table 12.2 TPC Registers
Name
Abbreviation
R/W
Port 1 data direction register
P1DDR
W
Port 1 data register
P1DR
R/(W)*
Port 2 data direction register
P2DDR
W
1
1
Initial Value
Address
H'00
H'FFB0
H'00
H'FFB2
H'00
H'FFB1
H'00
H'FFB3
Port 2 data register
P2DR
R/(W)*
TPC output mode register
TPMR
R/W
H'F0
H'FFEA
TPC output control register
TPCR
R/W
H'FF
H'FFEB
Next data enable register 2
NDER2
R/W
H'00
H'FFCD
Next data enable register 1
NDER1
R/W
H'00
H'FFD5
Next data register A
NDRA
R/W
H'00
H'FFCF/H'FFD7*2
Next data register B
NDRB
R/W
H'00
H'FFCE/H'FFD6* 2
Notes: 1. Bits used for TPC output cannot be written to.
2. The NDRA address is H'FFCF when the same output trigger is selected for TPC output
groups 0 and 1 by settings in TPCR. When the output triggers are different, the NDRA
address is H'FFD7 for group 0 and H'FFA5 for group 1. Similarly, the address of NDRB
is H'FFCE when the same output trigger is selected for TPC output groups 2 and 3 by
settings in TPCR. When the output triggers are different, the NDRB address is H'FFD6
for group 2 and H'FFCE for group 3.
296
12.2
Register Descriptions
12.2.1
Port 1 Data Direction Register (P1DDR)
P1DDR is an 8-bit write-only register that selects input or output for each pin in port 1.
Bit
7
6
5
4
3
2
1
0
P17DDR P16DDR P15DDR P14DDR P13DDR P12DDR P11DDR P10DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Port 1 is multiplexed with pins TP7 to TP0. Bits corresponding to pins used for TPC output must be
set to 1. For further information about P1DDR, see section 8.2, Port 1.
12.2.2
Port 1 Data Register (P1DR)
P1DR is an 8-bit readable/writable register that stores TPC output data for groups 0 and 1, when
these TPC output groups are used.
Bit
7
6
5
4
3
2
1
0
P17
P16
P15
P14
P13
P12
P11
P10
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
Note: * Bits selected for TPC output by NDER1 settings become read-only bits.
For further information about P1DR, see section 8.2, Port 1.
12.2.3
Port 2 Data Direction Register (P2DDR)
P2DDR is an 8-bit write-only register that selects input or output for each pin in port 2.
Bit
7
6
5
4
3
2
1
0
P27DDR P26DDR P25DDR P24DDR P23DDR P22DDR P21DDR P20DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Port 2 is multiplexed with pins TP15 to TP8. Bits corresponding to pins used for TPC output must
be set to 1. For further information about P2DDR, see section 8.3, Port 2.
297
12.2.4
Port 2 Data Register (P2DR)
P2DR is an 8-bit readable/writable register that stores TPC output data for groups 2 and 3, when
these TPC output groups are used.
Bit
7
6
5
4
3
2
1
0
P27
P26
P25
P24
P23
P22
P21
P20
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
Note: * Bits selected for TPC output by NDER2 settings become read-only bits.
For further information about P2DR, see section 8.3, Port 2.
12.2.5
Next Data Register A (NDRA)
NDRA is an 8-bit readable/writable register that stores the next output data for TPC output groups
1 and 0 (pins TP7 to TP0). During TPC output, when an FRT0 or FRT1 compare-match event
specified in TPCR occurs, NDRA contents are transferred to the corresponding bits in P1DR. The
address of NDRA differs depending on whether TPC output groups 0 and 1 have the same output
trigger or different output triggers.
NDRA is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Same Trigger for TPC Output Groups 0 and 1: If TPC output groups 0 and 1 are triggered by
the same compare-match event, the NDRA address is H'FFCF. The upper 4 bits belong to group 1
and the lower 4 bits to group 0. Address H'FFD7 consists entirely of reserved bits that cannot be
modified and always read 1.
• Address H'FFCF
Bit
7
6
5
4
3
2
1
0
NDR7
NDR6
NDR5
NDR4
NDR3
NDR2
NDR1
NDR0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits 7 to 4—Next Data 7 to 4 (NDR7 to NDR4): These bits store the next output data for TPC
output group 1.
Bits 3 to 0—Next Data 3 to 0 (NDR3 to NDR0): These bits store the next output data for TPC
output group 0.
298
• Address H'FFD7
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
—
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
Bits 7 to 0—Reserved: These bits cannot be modified and are always read as 1.
Different Triggers for TPC Output Groups 0 and 1: If TPC output groups 0 and 1 are triggered
by different compare-match events, the address of the upper 4 bits of NDRA (group 1) is H'FFCF
and the address of the lower 4 bits (group 0) is H'FFD7. Bits 3 to 0 of address H'FFCF and bits 7
to 4 of address H'FFD7 are reserved bits that cannot be modified and always read 1.
• Address H'FFCF
Bit
7
6
5
4
3
2
1
0
NDR7
NDR6
NDR5
NDR4
—
—
—
—
Initial value
0
0
0
0
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
—
—
—
—
Bits 7 to 4—Next Data 7 to 4 (NDR7 to NDR4): These bits store the next output data for TPC
output group 1.
Bits 3 to 0—Reserved: These bits cannot be modified and are always read as 1.
• Address H'FFD7
Bit
7
6
5
4
3
2
1
0
—
—
—
—
NDR3
NDR2
NDR1
NDR0
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
R/W
R/W
R/W
R/W
Bits 7 to 4—Reserved: These bits cannot be modified and are always read as 1.
Bits 3 to 0—Next Data 3 to 0 (NDR3 to NDR0): These bits store the next output data for TPC
output group 0.
299
12.2.6
Next Data Register B (NDRB)
NDRB is an 8-bit readable/writable register that stores the next output data for TPC output groups
3 and 2 (pins TP15 to TP8). During TPC output, when an FRT compare-match event specified in
TPCR occurs, NDRB contents are transferred to the corresponding bits in P2DR. The address of
NDRB differs depending on whether TPC output groups 2 and 3 have the same output trigger or
different output triggers.
NDRB is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Same Trigger for TPC Output Groups 2 and 3: If TPC output groups 2 and 3 are triggered by
the same compare-match event, the NDRB address is H'FFCE. The upper 4 bits belong to group 3
and the lower 4 bits to group 2. Address H'FFD6 consists entirely of reserved bits that cannot be
modified and always read 1.
• Address H'FFCE
Bit
7
6
5
4
3
2
1
0
NDR15
NDR14
NDR13
NDR12
NDR11
NDR10
NDR9
NDR8
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits 7 to 4—Next Data 15 to 12 (NDR15 to NDR12): These bits store the next output data for
TPC output group 3.
Bits 3 to 0—Next Data 11 to 8 (NDR11 to NDR8): These bits store the next output data for TPC
output group 2.
• Address H'FFD6
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
—
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
Bits 7 to 0—Reserved: These bits cannot be modified and are always read as 1.
300
Different Triggers for TPC Output Groups 2 and 3: If TPC output groups 2 and 3 are triggered
by different compare-match events, the address of the upper 4 bits of NDRB (group 3) is H'FFCE
and the address of the lower 4 bits (group 2) is H'FFD6. Bits 3 to 0 of address H'FFCE and bits 7
to 4 of address H'FFD6 are reserved bits that cannot be modified and always read 1.
• Address H'FFCE
Bit
7
6
5
4
3
2
1
0
NDR15
NDR14
NDR13
NDR12
—
—
—
—
Initial value
0
0
0
0
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
—
—
—
—
Bits 7 to 4—Next Data 15 to 12 (NDR15 to NDR12): These bits store the next output data for
TPC output group 3.
Bits 3 to 0—Reserved: These bits cannot be modified and are always read as 1.
• Address H'FFD6
Bit
7
6
5
4
3
2
1
0
—
—
—
—
NDR11
NDR10
NDR9
NDR8
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
R/W
R/W
R/W
R/W
Bits 7 to 4—Reserved: These bits cannot be modified and are always read as 1.
Bits 3 to 0—Next Data 11 to 8 (NDR11 to NDR8): These bits store the next output data for TPC
output group 2.
301
12.2.7
Next Data Enable Register 1 (NDER1)
NDER1 is an 8-bit readable/writable register that enables or disables TPC output groups 1 and 0
(TP7 to TP0) on a bit-by-bit basis.
Bit
7
6
5
4
3
2
1
0
NDER7
NDER6
NDER5
NDER4
NDER3
NDER2
NDER1
NDER0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
If a bit is enabled for TPC output by NDER1, then when the FRT compare-match event selected in
the TPC output control register (TPCR) occurs, the NDRA value is automatically transferred to
the corresponding P1DR bit, updating the output value. If TPC output is disabled, the bit value is
not transferred from NDRA to P1DR and the output value does not change.
NDER1 is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bits 7 to 0—Next Data Enable 7 to 0 (NDER7 to NDER0): These bits enable or disable TPC
output groups 1 and 0 (TP7 to TP0) on a bit-by-bit basis.
Bits 7 to 0:
NDER7 to NDER0
Description
0
TPC outputs TP7 to TP0 are disabled (NDR7 to NDR0 are not transferred to
P17 to P1 0)
(Initial value)
1
TPC outputs TP7 to TP0 are enabled (NDR7 to NDR0 are transferred to P17
to P10)
302
12.2.8
Next Data Enable Register 2 (NDER2)
NDER2 is an 8-bit readable/writable register that enables or disables TPC output groups 3 and 2
(TP15 to TP8) on a bit-by-bit basis.
Bit
7
6
5
4
3
2
NDER15 NDER14 NDER13 NDER12 NDER11 NDER10
1
0
NDER9
NDER8
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
If a bit is enabled for TPC output by NDER2, then when the FRT compare-match event selected in
the TPC output control register (TPCR) occurs, the NDRB value is automatically transferred to the
corresponding P2DR bit, updating the output value. If TPC output is disabled, the bit value is not
transferred from NDRB to P2DR and the output value does not change.
NDER2 is initialized to H'00 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bits 7 to 0—Next Data Enable 15 to 8 (NDER15 to NDER8): These bits enable or disable TPC
output groups 3 and 2 (TP15 to TP8) on a bit-by-bit basis.
Bits 7 to 0:
NDER15 to NDER8
Description
0
TPC outputs TP15 to TP8 are disabled (NDR15 to NDR8 are not transferred
to P27 to P2 0)
(Initial value)
1
TPC outputs TP15 to TP8 are enabled (NDR15 to NDR8 are transferred to
P27 to P2 0)
12.2.9
TPC Output Control Register (TPCR)
TPCR is an 8-bit readable/writable register that selects output trigger signals for TPC outputs on a
group-by-group basis.
Bit
7
6
5
4
3
2
1
0
G3CMS1 G3CMS0 G2CMS1 G2CMS0 G1CMS1 G1CMS0 G0CMS1 G0CMS0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TPCR is initialized to H'FF by a reset and in hardware standby mode. It is not initialized in
software standby mode.
303
Bits 7 and 6—Group 3 Compare Match Select 1 and 0 (G3CMS1, G3CMS0): These bits
select the compare-match event that triggers TPC output group 3 (TP 15 to TP12).
Bit 7
G3CMS1
Bit 6
G3CMS0
0
0
TPC output group 3 (TP 15 to TP12 ) is triggered by compare-match A in
FRT1
1
TPC output group 3 (TP 15 to TP12 ) is triggered by compare-match A in
FRT0
0
TPC output group 3 (TP 15 to TP12 ) is triggered by compare-match B in
FRT1 (compare-match A can be used for non-overlap operation)
1
TPC output group 3 (TP 15 to TP12 ) is triggered by compare-match B in
FRT0 (compare-match A can be used for non-overlap operation)
(Initial value)
1
Description
Bits 5 and 4—Group 2 Compare Match Select 1 and 0 (G2CMS1, G2CMS0): These bits
select the compare-match event that triggers TPC output group 2 (TP 11 to TP8).
Bit 5
G2CMS1
Bit 4
G2CMS0
0
0
TPC output group 2 (TP 11 to TP8) is triggered by compare-match A in
FRT1
1
TPC output group 2 (TP 11 to TP8) is triggered by compare-match A in
FRT0
0
TPC output group 2 (TP 11 to TP8) is triggered by compare-match B in
FRT1 (compare-match A can be used for non-overlap operation)
1
TPC output group 2 (TP 11 to TP8) is triggered by compare-match B in
FRT0 (compare-match A can be used for non-overlap operation)
(Initial value)
1
304
Description
Bits 3 and 2—Group 1 Compare Match Select 1 and 0 (G1CMS1, G1CMS0): These bits
select the compare-match event that triggers TPC output group 1 (TP 7 to TP4).
Bit 3
G1CMS1
Bit 2
G1CMS0
0
0
TPC output group 1 (TP 7 to TP4) is triggered by compare-match A in
FRT1
1
TPC output group 1 (TP 7 to TP4) is triggered by compare-match A in
FRT0
0
TPC output group 1 (TP 7 to TP4) is triggered by compare-match B in
FRT1 (compare-match A can be used for non-overlap operation)
1
TPC output group 1 (TP 7 to TP4) is triggered by compare-match B in
FRT0 (compare-match A can be used for non-overlap operation)
(Initial value)
1
Description
Bits 1 and 0—Group 0 Compare Match Select 1 and 0 (G0CMS1, G0CMS0): These bits
select the compare-match event that triggers TPC output group 0 (TP 3 to TP0).
Bit 1
G0CMS1
Bit 0
G0CMS0
0
0
TPC output group 0 (TP 3 to TP0) is triggered by compare-match A in
FRT1
1
TPC output group 0 (TP 3 to TP0) is triggered by compare-match A in
FRT0
0
TPC output group 0 (TP 3 to TP0) is triggered by compare-match B in
FRT1 (compare-match A can be used for non-overlap operation)
1
TPC output group 0 (TP 3 to TP0) is triggered by compare-match B in
FRT0 (compare-match A can be used for non-overlap operation)
(Initial value)
1
Description
305
12.2.10
TPC Output Mode Register (TPMR)
TPMR is an 8-bit readable/writable register that selects normal or non-overlapping TPC output for
each group.
Bit
7
6
5
4
3
2
1
0
—
—
—
—
G3NOV
G2NOV
G1NOV
G0NOV
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
R/W
R/W
R/W
R/W
The output trigger period of a non-overlapping TPC output waveform is set in output compare
register A (OCRA) in the FRT0 or FRT1 channel selected for output triggering. The non-overlap
margin is set in output compare register B (OCRB). The output values change at compare-match A
and B. For details see section 12.3.4, Non-Overlapping TPC Output.
TPMR is initialized to H'F0 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bits 7 to 4—Reserved: These bits cannot be modified, and are always read as 1.
Bit 3—Group 3 Non-Overlap (G3NOV): Selects normal or non-overlapping TPC output for
group 3 (TP15 to TP12).
Bit 3
G3NOV
0
1
Description
Normal TPC output in group 3
(output values change at the selected compare-match)
(Initial value)
Non-overlapping TPC output in group 3
(0 and 1 output at compare-match A and B, respectively)
Bit 2—Group 2 Non-Overlap (G2NOV): Selects normal or non-overlapping TPC output for
group 2 (TP11 to TP8).
Bit 2
G2NOV
0
1
306
Description
Normal TPC output in group 2
(output values change at the selected compare-match)
Non-overlapping TPC output in group 2
(0 and 1 output at compare-match A and B, respectively)
(Initial value)
Bit 1—Group 1 Non-Overlap (G1NOV): Selects normal or non-overlapping TPC output for
group 1 (TP7 to TP4).
Bit 1
G1NOV
0
1
Description
Normal TPC output in group 1
(output values change at the selected compare-match)
(Initial value)
Non-overlapping TPC output in group 1
(0 and 1 output at compare-match A and B, respectively)
Bit 0—Group 0 Non-Overlap (G0NOV): Selects normal or non-overlapping TPC output for
group 0 (TP3 to TP0).
Bit 0
G0NOV
0
1
Description
Normal TPC output in group 0
(output values change at the selected compare-match)
(Initial value)
Non-overlapping TPC output in group 0
(0 and 1 output at compare-match A and B, respectively)
307
12.3
Operation
12.3.1
Overview
When corresponding bits in P1DDR or P2DDR and NDER1 or NDER2 are set to 1, TPC output is
enabled. The TPC output initially consists of the corresponding P1DR or P2DR contents. When a
compare-match event selected in TPCR occurs, the corresponding NDRA or NDRB bit contents
are transferred to P1DR or P2DR to update the output values.
Figure 12.2 illustrates the TPC output operation. Table 12.3 summarizes the TPC operating
conditions.
NDER
DDR
Q
Q
Output trigger signal
C
Q
DR
D
Q
TPC output pin
NDR
D
Internal
data bus
Figure 12.2 TPC Output Operation
Table 12.3 TPC Operating Conditions
NDER
DDR
Pin Function
0
0
General-purpose input port
1
General-purpose output port
0
General-purpose input port (but software cannot write to the DR bit,
and when compare-match occurs, the NDR bit value is transferred to
the DR bit)
1
TPC pulse output
1
Sequential output of up to 16-bit patterns is possible by writing new output data to NDRA and
NDRB before the next compare-match. For information on non-overlapping operation, see section
12.3.4, Non-Overlapping TPC Output.
308
12.3.2
Output Timing
If TPC output is enabled, NDRA/NDRB contents are transferred to P1DR/P2DR and output when
the selected compare-match event occurs. Figure 12.3 shows the timing of these operations for the
case of normal output in groups 2 and 3, triggered by compare-match A.
ø
N
FRC
N+1
N
OCRA
Compare-match
A signal
n
NDRB
P2DR
m
n
TP8 to TP15
m
n
Figure 12.3 Timing of Transfer of Next Data Register Contents and Output (Example)
309
12.3.3
Normal TPC Output
Sample Setup Procedure for Normal TPC Output: Figure 12.4 shows a sample procedure for
setting up normal TPC output.
Normal TPC output
Select OCR functions
1
1. Set TCR or TOCR in the selected
FRT channel to disable unwanted
output signals.
Set OCR value
2
2. Set the TPC output trigger period.
Select counting operation
3
3. Select the counter clock source
with bits CKS1 and CKS0 in TCR.
Select the counter clear source
with bit CCLRA in TCSR.
Select interrupt request
4
Set initial output data
5
Select port output
6
FRT setup
Port and
TPC setup
Enable TPC output
7
4. Enable the OCI interrupt in TIER
or TCR. The DTU can also be set
up to transfer data to the next data
register.
5. Set the initial output values in the
DR bits of the input/output port
pins to be used for TPC output.
6. Set the DDR bits of the
input/output port pins to be used
for TPC output to 1.
7. Set the NDER bits of the pins to
be used for TPC output to 1.
Select TPC output trigger
8
8. Select the FRT compare-match
event to be used as the TPC
output trigger in TPCR.
Set next TPC output data
9
9. Set the next TPC output values in
the NDR bits.
Compare-match?
No
10. At each OCI interrupt, set the next
output values in the NDR bits.
Yes
Set next TPC output data
10
Note: Avoid allowing compare-match to occur while steps 4 to 9 are being carried out.
Figure 12.4 Setup Procedure for Normal TPC Output (Example)
310
Example of Normal TPC Output (Example of Five-Phase Pulse Output): Figure 12.5 shows
an example in which the TPC is used for cyclic five-phase pulse output.
FRC value
Compare-match
FRC
OCRA
Time
H'0000
NDRB
P2DR
80
00
CO
80
40
CO
60
40
20
60
30
20
10
30
18
10
08
18
88
08
80
88
CO
80
40
CO
TP15
TP14
TP13
TP12
TP11
1. The FRT channel to be used as the output trigger channel is set up so that the counter
will be cleared by compare-match A. The trigger period is set in OCRA. The OCIEA bit is
set to 1 in TIER or TCR to enable the compare-match A interrupt.
2. H'F8 is written in P2DDR and NDER2, and bits G3CMS1, G3CMS0, G2CMS1, and
G2CMS0 are set in TPCR to select compare-match in the FRT channel set up in step 1
as the output trigger. Output data H'80 is written in NDRB.
3. When compare-match A occurs, the NDRB contents are transferred to P2DR and output.
The compare-match A (OCIA) interrupt service routine writes the next output data (H'C0)
in NDRB.
4. Five-phase overlapping pulse output (one or two phases active at a time) can be
obtained by writing H'40, H'60, H'20, H'30, H'10, H'18, H'08, H'88… at successive OCIA
interrupts. If the DTU is set for activation by this interrupt, pulse output can be obtained
without loading the CPU.
Figure 12.5 Normal TPC Output Example (Five-Phase Pulse Output)
311
12.3.4
Non-Overlapping TPC Output
Sample Setup Procedure for Non-Overlapping TPC Output: Figure 12.6 shows a sample
procedure for setting up non-overlapping TPC output.
Non-overlapping TPC output
Select OCR functions
1
Set OCR values
2
Select counting operation
3
Select interrupt requests
4
FRT setup
1. Set TCR or TOCR in the selected
FRT channel to disable unwanted
output signals.
2. Set the TPC output trigger period
in OCRA and the non-overlap
margin in OCRB.
3. Select the counter clock source
with bits CKS1 and CKS0 in TCR.
Select the counter clear source
with bit CCLRA in TCSR.
4. Enable the OCIB interrupt in TIER
or TCR. The DTU can also be set
up to transfer data to the next
data register.
Set initial output data
5
Select TPC output
6
5. Set the initial output values in the
DR bits of the input/output port
pins to be used for TPC output.
Enable TPC transfer
7
6. Set the DDR bits of the
input/output port pins to be used
for TPC output to 1.
Select TPC transfer trigger
8
Select non-overlapping groups
9
Set next TPC output data
10
Port and
TPC setup
Compare-match B?
No
Yes
Set next TPC output data
11
7. Set the NDER bits of the pins to
be used for TPC output to 1.
8. In TPCR, select the FRT
compare-match event to be used
as the TPC output trigger.
9. In TPMR, select the groups that
will operate in non-overlap mode.
10. Set the next TPC output values in
the NDR bits.
11. At each OCIB interrupt, write the
next output value in the NDR bits.
Note: Avoid allowing compare-match to occur while steps 4 to 10 are being carried out.
Figure 12.6 Setup Procedure for Non-Overlapping TPC Output (Example)
312
Example of Non-Overlapping TPC Output (Example of Four-Phase Complementary NonOverlapping Output): Figure 12.7 shows an example of the use of TPC output for four-phase
complementary non-overlapping pulse output.
FRC value
OCRA
FRC
OCRB
Time
H'0000
NDRB
95
P2DR
00
65
95
59
05
65
56
41
59
95
50
56
14
65
95
05
65
Non-overlap
margin
TP15
TP14
TP13
TP12
TP11
TP10
TP9
TP8
1. The FRT channel to be used as the output trigger channel is set up so that the counter will
be cleared by compare-match A. The trigger period is set in OCRA. The non-overlap margin
is set in OCRB. The OCIEB bit is set to 1 in TIER or TCR to enable OCIB interrupts.
2. H'FF is written in P2DDR and NDER2, and bits G3CMS1, G3CMS0, G2CMS1, and
G2CMS0 are set in TPCR to select compare-match in the FRT channel set up in step 1 as
the output trigger. Bits G3NOV and G2NOV are set to 1 in TPMR to select non-overlapping
output. Output data H'95 is written in NDRB.
3. After FRT operation begins, when compare-match A occurs, outputs change from 1 to 0.
When compare-match B occurs, outputs change from 0 to 1 (the change from 0 to 1 is
delayed by the value of OCRB). The OCIB interrupt service routine writes the next output
data (H'65) in NDRB.
4. Four-phase complementary non-overlapping pulse output can be obtained by writing H'59,
H'56, H'95… at successive OCIB interrupts. If the DTU is set for activation by this interrupt,
pulse output can be obtained without loading the CPU.
Figure 12.7 Non-Overlapping TPC Output Example (Four-Phase Complementary
Non-Overlapping Pulse Output)
313
12.4
Application Notes
12.4.1
Operation of TPC Output Pins
TP 0 to TP15 are multiplexed with address output in the expanded modes. When address output is
enabled in mode 1, the corresponding pins cannot be used for TPC output. The data transfer from
NDR bits to DR bits takes place, however, regardless of the usage of the pin.
Pin functions should be changed only under conditions in which the output trigger event will not
occur.
12.4.2
Note on Non-Overlapping Output
During non-overlapping operation, the transfer of NDR bit values to DR bits takes place as
follows.
1. NDR bits are always transferred to DR bits at compare-match B.
2. At compare-match A, NDR bits are transferred only if their value is 0. Bits are not transferred
if their value is 1.
Figure 12.8 illustrates the non-overlapping TPC output operation.
DDR
NDER
Q
Q
Compare-match B
Compare-match A
C
Q
DR
D
Q
TPC output pin
Figure 12.8 Non-Overlapping TPC Output
314
NDR
D
Therefore, 0 data can be transferred ahead of 1 data by making compare-match A occur before
compare-match B. NDR contents should not be altered during the interval from compare-match A
to compare-match B (the non-overlap margin).
This can be accomplished by having the OCIB interrupt service routine write the next data in
NDR, or by having the OCIB interrupt activate the DTU. The next data must be written before the
next compare-match A occurs.
Figure 12.9 shows the timing relationships.
Comparematch B
Comparematch A
NDR write
NDR write
NDR
DR
0 output
0/1 output
Do not
write to
NDR in
this interval
Write to NDR
in this interval
0 output
0/1 output
Do not
write to
NDR in
this interval
Write to NDR
in this interval
Figure 12.9 Non-Overlapping Operation and NDR Write Timing
315
Section 13 Watchdog Timer
13.1
Overview
The H8/3318 on-chip watchdog timer (WDT) module can monitor system operation by requesting
a nonmaskable interrupt internally if a system crash allows the timer count to overflow. It can also
generate an internal chip reset instead of a nonmaskable interrupt.
When this watchdog function is not needed, the WDT module can be used as an interval timer. In
interval timer mode, it requests an OVF interrupt at each counter overflow.
13.1.1
Features
• Selection of eight clock sources
• Selection of two modes:
 Watchdog timer mode
 Interval timer mode
• Counter overflow generates an interrupt request or reset:
 Reset or NMI request in watchdog timer mode
 OVF interrupt request in interval timer mode
317
13.1.2
Block Diagram
Figure 13.1 is a block diagram of the watchdog timer.
Reset or internal NMI
(Watchdog timer mode)
Interrupt
signals
OVF (Interval
timer mode)
Interrupt
control
Overflow
Internal
data bus
TCNT
Read/write
control
TCSR
Internal clock source
Clock
Clock
select
Legend
TCNT: Timer counter
TCSR: Timer control/status register
øP/2
øP/32
øP/64
øP/128
øP/256
øP/512
øP/2048
øP/4096
Figure 13.1 Block Diagram of Watchdog Timer
13.1.3
Register Configuration
Table 13.1 lists information on the watchdog timer registers.
Table 13.1 Register Configuration
Name
Abbreviation
R/W
Initial
Value
Timer counter
TCNT
R/W
Timer control/status register
TCSR
R/(W)*
Addresses
Write
Read
H'00
H'FFAA
(word transfer)
H'FFAB
H'10
H'FFAA
(word transfer)
H'FFAA
Note: * Software can write a 0 to clear the status flag bits, but cannot write 1.
318
13.2
Register Descriptions
13.2.1
Timer Counter (TCNT)
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The watchdog timer counter (TCNT) is a read/write 8-bit up-counter. (TCNT is write-protected by
a password. See section 13.2.3, Register Access, for details.) When the timer enable bit (TME) in
the timer control/status register (TCSR) is set to 1, the timer counter starts counting pulses of an
internal clock source selected by clock select bits 2 to 0 (CKS2 to CKS0) in TCSR. When the
count overflows (changes from H'FF to H'00), an overflow flag (OVF) in TCSR is set to 1.
The watchdog timer counter is initialized to H'00 by a reset and when the TME bit is cleared to 0.
Note: TCNT is more difficult to write to than other registers. See section 13.2.3, Register
Access, for details.
13.2.2
Timer Control/Status Register (TCSR)
Bit
7
6
5
4
3
2
1
0
OVF
WT/IT
TME
—
RST/NMI
CKS2
CKS1
CKS0
Initial value
0
0
0
1
0
0
0
0
Read/Write
R/(W)*
R/W
R/W
—
R/W
R/W
R/W
R/W
Note: * Software can write a 0 in bit 7 to clear the flag, but cannot write a 1 in this bit.
The watchdog timer control/status register (TCSR) is an 8-bit read/write register that selects the
timer mode and clock source and performs other functions. (TCSR is write-protected by a
password. See section 13.2.3, Register Access, for details.)
Bits 7 to 5 and bit 3 are initialized to 0 by a reset and in the standby modes. Bits 2 to 0 are
initialized to 0 by a reset, but retain their values in the standby modes.
Note: TCSR is more difficult to write to than other registers. See section 13.2.3, Register
Access, for details.
319
Bit 7—Overflow Flag (OVF): Indicates that the watchdog timer count has overflowed.
Bit 7
OVF
Description
0
To clear OVF, the CPU must read OVF after it has been set to 1, then write a 0 in this
bit
(Initial value)
1
Set to 1 when TCNT changes from H'FF to H'00
Bit 6—Timer Mode Select (WT/IT): Selects whether to operate in watchdog timer mode or
interval timer mode.
Bit 6
WT/IT
Description
0
Interval timer mode (OVF request)
1
Watchdog timer mode (reset or NMI request)
(Initial value)
Bit 5—Timer Enable (TME): Enables or disables the timer.
Bit 5
TME
Description
0
TCNT is initialized to H'00 and stopped
1
TCNT runs and requests a reset or an interrupt when it overflows
(Initial value)
Bit 4—Reserved: This bit cannot be modified and is always read as 1.
Bit 3—Reset or NMI Select (RST/NMI): Selects either an internal reset or the NMI function at
watchdog timer overflow.
Bit 3
RST/NMI
Description
0
NMI function enabled
1
Reset function enabled
(Initial value)
Bits 2–0—Clock Select (CKS2–CKS0): These bits select one of eight clock sources obtained by
dividing the system clock (ø).
The overflow interval listed in the following table is the time from when the watchdog timer
counter begins counting from H'00 until an overflow occurs.
In interval timer mode, OVF interrupts are requested at this interval.
320
Bit 2
CKS2
Bit 1
CKS1
Bit 0
CKS0
Clock Source
Overflow Interval (øP = 10 MHz)
0
0
0
øP/2
51.2 µs
1
øP/32
819.2 µs
0
øP/64
1.6 ms
1
øP/128
3.3 ms
0
øP/256
6.6 ms
1
øP/512
13.1 ms
0
øP/2048
52.4 ms
1
øP/4096
104.9 ms
1
1
0
1
13.2.3
(Initial value)
Register Access
The watchdog timer’s TCNT and TCSR registers are more difficult to write to than other registers.
The procedures for writing and reading these registers are given below.
Writing to TCNT and TCSR: Word access is required. Byte data transfer instructions cannot be
used for write access.
The TCNT and TCSR registers have the same write address. The write data must be contained in
the lower byte of a word written at this address. The upper byte must contain H'5A (password for
TCNT) or H'A5 (password for TCSR). See figure 13.2. The result of the access depicted in figure
13.2 is to transfer the write data from the lower byte to TCNT or TCSR.
15
Writing to TCNT
H'FFAA
8 7
H'5A
15
Writing to TCSR
H'FFAA
0
Write data
8 7
H'A5
0
Write data
Figure 13.2 Writing to TCNT and TCSR
Reading TCNT and TCSR: The read addresses are H'FFAA for TCSR and H'FFAB for TCNT,
as indicated in table 13.2.
These two registers are read like other registers. Byte access instructions can be used.
321
Table 13.2 Read Addresses of TCNT and TCSR
Read Address
Register
H'FFAA
TCSR
H'FFAB
TCNT
13.3
Operation
13.3.1
Watchdog Timer Mode
The watchdog timer function begins operating when software sets the WT/IT and TME bits to 1 in
TCSR. Thereafter, software should periodically rewrite the contents of the timer counter (normally
by writing H'00) to prevent the count from overflowing. If a program crash allows the timer count
to overflow, the watchdog timer either requests a nonmaskable interrupt (NMI) or resets the entire
chip for 518 system clocks (ø), depending on the status of bit 3 of TCSR. Figure 13.3 shows the
operation.
NMI requests from the watchdog timer have the same vector as NMI requests from the NMI pin.
NMI requests from the watchdog timer and pin NMI should not be handled simultaneously.
A reset from the watchdog timer has the same vector as an external reset from the RES pin. The
reset source can be determined by the XRST bit in SYSCR.
Watchdog timer overflow
H'FF
WT/IT = 1
TME = 1
TCNT
count
Time t
H'00
OVF = 1
WT/IT = 1
TME = 1
H'00 written
to TCNT
Reset
generated
H'00 written
to TCNT
518 ø
Figure 13.3 Operation in Watchdog Timer Mode
322
13.3.2
Interval Timer Mode
Interval timer operation begins when the WT/IT bit is cleared to 0 and the TME bit is set to 1.
In interval timer mode, an OVF request is generated each time the timer count overflows. This
function can be used to generate OVF requests at regular intervals. See figure 13.4.
H'FF
TCNT count
Time t
H'00
WT/IT = 0
TME = 1
OVF
request
OVF
request
OVF
request
OVF
request
OVF
request
Figure 13.4 Operation in Interval Timer Mode
13.3.3
Setting the Overflow Flag
The OVF bit is set to 1 when the timer count overflows. Simultaneously, the WDT module
requests an internal reset, NMI, or OVF interrupt. The timing is shown in figure 13.5.
ø
TCNT
H'FF
H'00
Internal overflow
signal
OVF
Figure 13.5 Setting the OVF Bit
323
13.4
Application Notes
13.4.1
Contention between TCNT Write and Increment
If a timer counter clock pulse is generated during the T3 state of a write cycle to the timer counter,
the write takes priority and the timer counter is not incremented. See figure 13.6.
Write cycle (CPU writes to TCNT)
T1
T2
T3
ø
Internal address bus
TCNT address
Internal write signal
TCNT clock pulse
TCNT
N
M
Counter write data
Figure 13.6 TCNT Write-Increment Contention
13.4.2
Changing the Clock Select Bits (CKS2 to CKS0)
Software should stop the watchdog timer (by clearing the TME bit to 0) before changing the value
of the clock select bits. If the clock select bits are modified while the watchdog timer is running,
the timer count may be incremented incorrectly.
13.4.3
Recovery from Software Standby Mode
TCSR bits, except bits 0–2, and the TCNT counter are reset when the chip recovers from software
standby mode. Re-initialize the watchdog timer as necessary to resume normal operation.
324
Section 14 Serial Communication Interface
14.1
Overview
The H8/3318 includes two serial communication interface channels (SCI0 and SCI1) for
transferring serial data to and from other chips. Either synchronous or asynchronous
communication can be selected.
14.1.1
Features
The features of the on-chip serial communication interface are:
• Asynchronous mode
An H8/3318 microcontroller can communicate with a UART (Universal Asynchronous
Receiver/Transmitter), ACIA (Asynchronous Communication Interface Adapter), or other chip
that employs standard asynchronous serial communication. It also has a multiprocessor
communication function for communication with other processors. Twelve data formats are
available.
 Data length: 7 or 8 bits
 Stop bit length: 1 or 2 bits
 Parity: Even, odd, or none
 Multiprocessor bit: 1 or 0
 Error detection: Parity, overrun, and framing errors
•
•
•
•
 Break detection: When a framing error occurs, the break condition can be detected by
reading the level of the RxD line directly.
Synchronous mode
The SCI can communicate with chips able to perform clocked synchronous data transfer.
 Data length: 8 bits
 Error detection: Overrun errors
Full duplex communication
The transmitting and receiving sections are independent, so each channel can transmit and
receive simultaneously. Both the transmit and receive sections use double buffering, so
continuous data transfer is possible in either direction.
Built-in baud rate generator
Any specified bit rate can be generated.
Internal or external clock source
The SCI can operate on an internal clock signal from the baud rate generator, or an external
clock signal input at the SCK0 or SCK1 pin.
325
• Four interrupts
TDR-empty, TSR-empty, receive-end, and receive-error interrupts are requested
independently.
14.1.2
Block Diagram
Bus interface
Figure 14.1 shows a block diagram of one serial communication interface channel.
Module data bus
RDR
TDR
SSR
Internal
data bus
BRR
SCR
SMR
RxD
TxD
RSR
TSR
Parity
generate
SCMR
Baud rate
generator
Communication
control
Internal
ø
øP/4 clock
øP/16
øP/64
Clock
Parity check
External clock source
SCK
Legend
RSR: Receive shift register (8 bits)
RDR: Receive data register (8 bits)
TSR: Transmit shift register (8 bits)
TDR: Transmit data register (8 bits)
SMR: Serial mode register (8 bits)
SCR: Serial control register (8 bits)
SSR: Serial status register (8 bits)
BRR: Bit rate register (8 bits)
SCMR: Serial communication mode register (8 bits)
TEI
TXI
RXI
ERI
Interrupt signals
Figure 14.1 Block Diagram of Serial Communication Interface
326
14.1.3
Input and Output Pins
Table 14.1 lists the input and output pins used by the SCI module.
Table 14.1 SCI Input/Output Pins
Channel
Name
Abbr.*
I/O
Function
0
Serial clock
SCK 0
Input/output
Serial clock input and output
Receive data
RxD0
Input
Receive data input
Transmit data
TxD0
Output
Transmit data output
Serial clock
SCK 1
Input/output
Serial clock input and output
Receive data
RxD1
Input
Receive data input
Transmit data
TxD1
Output
Transmit data output
1
Note: * In this manual, the channel subscripts are normally omitted.
327
14.1.4
Register Configuration
Table 14.2 lists the SCI registers. These registers specify the operating mode (synchronous or
asynchronous), data format and bit rate, and control the transmit and receive sections.
Table 14.2 SCI Registers
Channel
Name
Abbr.
R/W
Value
Address
0
Receive shift register
RSR
—
—
—
Receive data register
RDR
R
H'00
H'FFDD
Transmit shift register
TSR
—
—
—
Transmit data register
TDR
R/W
H'FF
H'FFDB
Serial mode register
SMR
R/W
H'00
H'FFD8
Serial control register
SCR
R/W
H'00
H'FFDA
Serial status register
SSR
R/(W)*
H'84
H'FFDC
Bit rate register
BRR
R/W
H'FF
H'FFD9
Serial communication
mode register
SCMR
R/W
H'F2
H'FFDE
Receive shift register
RSR
—
—
—
Receive data register
RDR
R
H'00
H'FF8D
Transmit shift register
TSR
—
—
—
Transmit data register
TDR
R/W
H'FF
H'FF8B
Serial mode register
SMR
R/W
H'00
H'FF88
Serial control register
SCR
R/W
H'00
H'FF8A
Serial status register
SSR
R/(W)*
H'84
H'FF8C
Bit rate register
BRR
R/W
H'FF
H'FF89
R/W
H'1C
H'FFC3
1
0 and 1
Serial/timer control register STCR
Note: * Software can write a 0 to clear the flags in bits 7 to 3, but cannot write 1 in these bits.
328
14.2
Register Descriptions
14.2.1
Receive Shift Register (RSR)
Bit
7
6
5
4
3
2
1
0
Read/Write
—
—
—
—
—
—
—
—
RSR is a shift register that converts incoming serial data to parallel data. When one data character
has been received, it is transferred to the receive data register (RDR).
The CPU cannot read or write RSR directly.
14.2.2
Receive Data Register (RDR)
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
RDR stores received data. As each character is received, it is transferred from RSR to RDR,
enabling RSR to receive the next character. This double-buffering allows the SCI to receive data
continuously.
RDR is a read-only register. RDR is initialized to H'00 by a reset and in the standby modes.
14.2.3
Transmit Shift Register (TSR)
Bit
7
6
5
4
3
2
1
0
Read/Write
—
—
—
—
—
—
—
—
TSR is a shift register that converts parallel data to serial transmit data. When transmission of one
character is completed, the next character is moved from the transmit data register (TDR) to TSR
and transmission of that character begins. If the TDRE bit is still set to 1, however, nothing is
transferred to TSR.
The CPU cannot read or write TSR directly.
329
14.2.4
Transmit Data Register (TDR)
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TDR is an 8-bit readable/writable register that holds the next data to be transmitted. When TSR
becomes empty, the data written in TDR is transferred to TSR. Continuous data transmission is
possible by writing the next data in TDR while the current data is being transmitted from TSR.
TDR is initialized to H'FF by a reset and in the standby modes.
14.2.5
Serial Mode Register (SMR)
Bit
7
6
5
4
3
2
1
0
C/A
CHR
PE
O/E
STOP
MP
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SMR is an 8-bit readable/writable register that controls the communication format and selects the
clock source of the on-chip baud rate generator. It is initialized to H'00 by a reset and in the
standby modes. For further information on the SMR settings and communication formats, see
tables 14.5 and 14.7 in section 14.3, Operation.
Bit 7—Communication Mode (C/A): This bit selects asynchronous or synchronous
communication mode.
Bit 7
C/A
Description
0
Asynchronous communication
1
Synchronous communication
(Initial value)
Bit 6—Character Length (CHR): This bit selects the character length in asynchronous mode.
It is ignored in synchronous mode.
Bit 6
CHR
Description
0
8 bits per character
1
7 bits per character (Bits 0 to 6 of TDR and RDR are used for transmitting and
receiving, respectively)
330
(Initial value)
Bit 5—Parity Enable (PE): This bit selects whether to add a parity bit in asynchronous mode.
It is ignored in synchronous mode, and when a multiprocessor format is used.
Bit 5
PE
Description
0
Transmit: No parity bit is added.
(Initial value)
Receive: Parity is not checked.
1
Transmit: A parity bit is added.
Receive: Parity is checked.
Bit 4—Parity Mode (O/E ): In asynchronous mode, when parity is enabled (PE = 1), this bit
selects even or odd parity.
Even parity means that a parity bit is added to the data bits for each character to make the total
number of 1’s even. Odd parity means that the total number of 1’s is made odd.
This bit is ignored when PE = 0, or when a multiprocessor format is used. It is also ignored in
synchronous mode.
Bit 4
O/E
Description
0
Even parity
1
Odd parity
(Initial value)
Bit 3—Stop Bit Length (STOP): This bit selects the number of stop bits. It is ignored in
synchronous mode.
Bit 3
STOP
Description
0
One stop bit
(Initial value)
Transmit: One stop bit is added.
Receive: One stop bit is checked to detect framing errors.
1
Two stop bits
Transmit: Two stop bits are added.
Receive: The first stop bit is checked to detect framing errors. If the second stop bit is
a space (0), it is regarded as the next start bit.
331
Bit 2—Multiprocessor Mode (MP): This bit selects the multiprocessor format. When
multiprocessor format is selected, the parity settings of the parity enable bit (PE) and parity mode
bit (O/E) are ignored. The MP bit setting is valid only in asynchronous communication, and is
ignored in synchronous communication.
Bit 2
MP
Description
0
Multiprocessor communication function is disabled.
1
Multiprocessor communication function is enabled.
(Initial value)
Bits 1 and 0—Clock Select 1 and 0 (CKS1 and CKS0): These bits select the clock source of the
on-chip baud rate generator.
Bit 1
CKS1
Bit 0
CKS0
Description
0
0
ø clock
1
øP/4 clock
0
øP/16 clock
1
øP/64 clock
1
14.2.6
(Initial value)
Serial Control Register (SCR)
Bit
7
6
5
4
3
2
1
0
TIE
RIE
TE
RE
MPIE
TEIE
CKE1
CKE0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SCR is an 8-bit readable/writable register that enables or disables various SCI functions.
It is initialized to H'00 by a reset and in the standby modes.
Bit 7—Transmit Interrupt Enable (TIE): This bit enables or disables the TDR-empty interrupt
(TXI) requested when the transmit data register empty (TDRE) bit in the serial status register
(SSR) is set to 1.
Bit 7
TIE
Description
0
The TDR-empty interrupt request (TXI) is disabled.
1
The TDR-empty interrupt request (TXI) is enabled.
332
(Initial value)
Bit 6—Receive Interrupt Enable (RIE): This bit enables or disables the receive-end interrupt
(RXI) requested when the receive data register full (RDRF) bit in the serial status register (SSR) is
set to 1, and the receive error interrupt (ERI) requested when the overrun error (ORER), framing
error (FER), or parity error (PER) bit in the serial status register (SSR) is set to 1.
Bit 6
RIE
Description
0
The receive-end interrupt (RXI) and receive-error (ERI) requests are disabled.
(Initial value)
1
The receive-end interrupt (RXI) and receive-error (ERI) requests are enabled.
Bit 5—Transmit Enable (TE): This bit enables or disables the transmit function. When the
transmit function is enabled, the TxD pin is automatically used for output. When the transmit
function is disabled, the TxD pin can be used as a general-purpose I/O port.
Bit 5
TE
Description
0
The transmit function is disabled.
(Initial value)
The TxD pin can be used for general-purpose I/O.
1
The transmit function is enabled. The TxD pin is used for output.
Bit 4—Receive Enable (RE): This bit enables or disables the receive function. When the receive
function is enabled, the RxD pin is automatically used for input. When the receive function is
disabled, the RxD pin is available as a general-purpose I/O port.
Bit 4
RE
Description
0
The receive function is disabled.
(Initial value)
The RxD pin can be used for general-purpose I/O.
1
The receive function is enabled.
The RxD pin is used for input.
Bit 3—Multiprocessor Interrupt Enable (MPIE): When serial data is received in a
multiprocessor format, this bit enables or disables the receive-end interrupt (RXI) and receiveerror interrupt (ERI) until data with the multiprocessor bit set to 1 is received. It also enables or
disables the transfer of received data from RSR to RDR, and enables or disables setting of the
RDRF, FER, PER, and ORER bits in the serial status register (SSR).
The MPIE bit is ignored when the MP bit is cleared to 0, and in synchronous mode.
Clearing the MPIE bit to 0 disables the multiprocessor receive interrupt function. In this condition
data is received regardless of the value of the multiprocessor bit in the receive data.
333
Setting the MPIE bit to 1 enables the multiprocessor receive interrupt function. In this condition, if
the multiprocessor bit in the receive data is 0, the receive-end interrupt (RXI) and receive-error
interrupt (ERI) are disabled, the receive data is not transferred from RSR to RDR, and the RDRF,
FER, PER, and ORER bits in the serial status register (SSR) are not set. If the multiprocessor bit is
1, however, the MPB bit in SSR is set to 1, the MPIE bit is cleared to 0, the receive data is
transferred from RSR to RDR, the FER, PER, and ORER bits can be set, and the receive-end and
receive-error interrupts are enabled.
Bit 3
MPIE
Description
0
The multiprocessor receive interrupt function is disabled.
(Normal receive operation)
(Initial value)
1
The multiprocessor receive interrupt function is enabled. During the interval before
data with the multiprocessor bit set to 1 is received, the receive interrupt request (RXI)
and receive-error interrupt request (ERI) are disabled, the RDRF, FER, PER, and
ORER bits are not set in the serial status register (SSR), and no data is transferred
from the RSR to the RDR. The MPIE bit is cleared at the following times:
1. When 0 is written in MPIE
2. When data with the multiprocessor bit set to 1 is received
Bit 2—Transmit-End Interrupt Enable (TEIE): This bit enables or disables the TSR-empty
interrupt (TEI) requested when the transmit-end bit (TEND) in the serial status register (SSR) is
set to 1.
Bit 2
TEIE
Description
0
The TSR-empty interrupt request (TEI) is disabled.
1
The TSR-empty interrupt request (TEI) is enabled.
(Initial value)
Bit 1—Clock Enable 1 (CKE1): This bit selects the internal or external clock source for the baud
rate generator. When the external clock source is selected, the SCK pin is automatically used for
input of the external clock signal.
Bit 1
CKE1
Description
0
Internal clock source
When C/A = 1, the serial clock signal is output at the SCK pin.
When C/A = 0, output depends on the CKE0 bit.
1
External clock source
The SCK pin is used for input.
334
(Initial value)
Bit 0—Clock Enable 0 (CKE0): When an internal clock source is used in asynchronous mode,
this bit enables or disables serial clock output at the SCK pin.
This bit is ignored when the external clock is selected, or when synchronous mode is selected.
For further information on the communication format and clock source selection, see table 14.6 in
section 14.3, Operation.
Bit 0
CKE0
Description
0
The SCK pin is not used by the SCI (and is available as a general-purpose I/O port).
(Initial value)
1
The SCK pin is used for serial clock output.
14.2.7
Serial Status Register (SSR)
Bit
7
6
5
4
3
2
1
0
TDRE
RDRF
ORER
FER
PER
TEND
MPB
MPBT
Initial value
1
0
0
0
0
1
0
0
Read/Write
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R
R
R/W
Note: * Software can write a 0 to clear the flags, but cannot write a 1 in these bits.
SSR is an 8-bit register that indicates transmit and receive status. It is initialized to H'84 by a reset
and in the standby modes.
Bit 7—Transmit Data Register Empty (TDRE): This bit indicates when transmit data can safely
be written in TDR.
Bit 7
TDRE
0
Description
To clear TDRE, the CPU must read TDRE after it has been set to 1, then write a 0 in
this bit.
Otherwise, when a data is written to TDR in the DTU bus cycle.
1
This bit is set to 1 at the following times:
(Initial value)
1. When TDR contents are transferred to TSR
2. When the TE bit in SCR is cleared to 0
335
Bit 6—Receive Data Register Full (RDRF): This bit indicates when one character has been
received and transferred to RDR.
Bit 6
RDRF
0
Description
To clear RDRF, the CPU must read RDRF after it has been set to 1, then write a 0 in
this bit.
(Initial value)
Otherwise, when RDR is read in the DTU bus cycle.
1
This bit is set to 1 when one character is received without error and transferred from
RSR to RDR.
Bit 5—Overrun Error (ORER): This bit indicates an overrun error during reception.
Bit 5
ORER
Description
0
To clear ORER, the CPU must read ORER after it has been set to 1, then write a 0 in
this bit.
(Initial value)
1
This bit is set to 1 if reception of the next character ends while the receive data
register is still full (RDRF = 1).
Bit 4—Framing Error (FER): This bit indicates a framing error during data reception in
asynchronous mode. It has no meaning in synchronous mode.
Bit 4
FER
Description
0
To clear FER, the CPU must read FER after it has been set to 1, then write a 0 in this
bit.
(Initial value)
1
This bit is set to 1 if a framing error occurs (stop bit = 0).
Bit 3—Parity Error (PER): This bit indicates a parity error during data reception in the
asynchronous mode, when a communication format with parity bits is used.
This bit has no meaning in the synchronous mode, or when a communication format without
parity bits is used.
Bit 3
PER
Description
0
To clear PER, the CPU must read PER after it has been set to 1, then write a 0 in this
bit.
(Initial value)
1
This bit is set to 1 when a parity error occurs (the parity of the received
data does not match the parity selected by the O/E bit in SMR).
336
Bit 2—Transmit End (TEND): This bit indicates that the serial communication interface has
stopped transmitting because there was no valid data in TDR when the last bit of the current
character was transmitted. The TEND bit is also set to 1 when the TE bit in the serial control
register (SCR) is cleared to 0.
The TEND bit is a read-only bit and cannot be modified directly. To use the TEI interrupt, first
start transmitting data, which clears TEND to 0, then set TEIE to 1.
Bit 2
TEND
Description
0
To clear TEND, the CPU must read TDRE after TDRE has been set to 1, then write a
0 in TDRE.
(Initial value)
1
This bit is set to 1 when:
1. TE = 0
2. TDRE = 1 at the end of transmission of a character
Bit 1—Multiprocessor Bit (MPB): Stores the value of the multiprocessor bit in data received in a
multiprocessor format in asynchronous communication mode. This bit retains its previous value in
synchronous mode, when a multiprocessor format is not used, or when the RE bit is cleared to 0
even if a multiprocessor format is used.
MPB can be read but not written.
Bit 1
MPB
Description
0
Multiprocessor bit = 0 in receive data.
1
Multiprocessor bit = 1 in receive data.
(Initial value)
Bit 0—Multiprocessor Bit Transfer (MPBT): Stores the value of the multiprocessor bit inserted
in transmit data when a multiprocessor format is used in asynchronous communication mode. The
MPBT bit is double-buffered in the same way as TSR and TDR. The MPBT bit has no effect in
synchronous mode, or when a multiprocessor format is not used.
Bit 0
MPBT
Description
0
Multiprocessor bit = 0 in transmit data.
1
Multiprocessor bit = 1 in transmit data.
(Initial value)
337
14.2.8
Bit Rate Register (BRR)
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BRR is an 8-bit register that, together with the CKS1 and CKS0 bits in SMR, determines the bit
rate output by the baud rate generator.
BRR is initialized to H'FF by a reset and in the standby modes.
Tables 14.3 to 14.6 show examples of BRR settings.
Table 14.3 Examples of BRR Settings in Asynchronous Mode (When øP = ø)
ø (MHz)
2
2.4576
3
3.6864
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
1
141
+0.03
1
174
–0.26
1
212
+0.03
2
64
+0.70
150
1
103
+0.16
1
127
0
1
155
+0.16
1
191
0
300
0
207
+0.16
0
255
0
1
77
+0.16
1
95
0
600
0
103
+0.16
0
127
0
0
155
+0.16
0
191
0
1200
0
51
+0.16
0
63
0
0
77
+0.16
0
95
0
2400
0
25
+0.16
0
31
0
0
38
+0.16
0
47
0
4800
0
12
+0.16
0
15
0
0
19
–2.34
0
23
0
9600
—
—
—
0
7
0
0
9
–2.34
0
11
0
19200
—
—
—
0
3
0
0
4
–2.34
0
5
0
31250
0
1
0
—
—
—
0
2
0
—
—
—
38400
—
—
—
0
1
0
—
—
—
0
2
0
Note: If possible, the error should be within 1%.
338
Table 14.3 Examples of BRR Settings in Asynchronous Mode (When øP = ø) (cont)
ø (MHz)
4
4.9152
5
6
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
2
70
+0.03
2
86
+0.31
2
88
–0.25
2
106
–0.44
150
1
207
+0.16
1
255
0
2
64
+0.16
2
77
+0.16
300
1
103
+0.16
1
127
0
1
129
+0.16
1
155
+0.16
600
0
207
+0.16
0
255
0
1
64
+0.16
1
77
+0.16
1200
0
103
+0.16
0
127
0
0
129
+0.16
0
155
+0.16
2400
0
51
+0.16
0
63
0
0
64
+0.16
0
77
+0.16
4800
0
25
+0.16
0
31
0
0
32
–1.36
0
38
+0.16
9600
0
12
+0.16
0
15
0
0
15
+1.73
0
19
–2.34
19200
—
—
—
0
7
0
0
7
+1.73
0
9
–2.34
31250
0
3
0
0
4
–1.70
0
4
0
0
5
0
38400
—
—
—
0
3
0
0
3
+1.73
0
4
–2.34
ø (MHz)
6.144
7.3728
8
9.8304
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
2
108
+0.08
2
130
–0.07
2
141
+0.03
2
174
–0.26
150
2
79
0
2
95
0
2
103
+0.16
2
127
0
300
1
159
0
1
191
0
1
207
+0.16
1
255
0
600
1
79
0
1
95
0
1
103
+0.16
1
127
0
1200
0
159
0
0
191
0
0
207
+0.16
0
255
0
2400
0
79
0
0
95
0
0
103
+0.16
0
127
0
4800
0
39
0
0
47
0
0
51
+0.16
0
63
0
9600
0
19
0
0
23
0
0
25
+0.16
0
31
0
19200
0
4
0
0
11
0
0
12
+0.16
0
15
0
31250
0
5
+2.40
—
—
—
0
7
0
0
9
–1.70
38400
0
4
0
0
5
0
—
—
—
0
7
0
Note: If possible, the error should be within 1%.
339
Table 14.3 Examples of BRR Settings in Asynchronous Mode (When øP = ø) (cont)
ø (MHz)
10
12
12.288
14.7456
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
2
177
–0.25
2
212
+0.03
2
217
+0.08
3
64
+0.70
150
2
129
+0.16
2
155
+0.16
2
159
0
2
191
0
300
2
64
+0.16
2
77
+0.16
2
79
0
2
95
0
600
1
129
+0.16
1
155
+0.16
1
159
0
1
191
0
1200
1
64
+0.16
1
77
+0.16
1
79
0
1
95
0
2400
0
129
+0.16
0
155
+0.16
0
159
0
0
191
0
4800
0
64
+0.16
0
77
+0.16
0
79
0
0
95
0
9600
0
32
–1.36
0
38
+0.16
0
39
0
0
47
0
19200
0
15
+1.73
0
19
–2.34
0
19
0
0
23
0
31250
0
9
0
0
11
0
0
11
+2.4
0
14
–1.7
38400
0
7
+1.73
0
9
–2.34
0
9
0
0
11
0
ø (MHz)
16
Bit Rate
(bits/s)
n
N
Error
(%)
110
3
70
+0.03
150
2
207
+0.16
300
2
103
+0.16
600
1
207
+0.16
1200
1
103
+0.16
2400
0
207
+0.16
4800
0
103
+0.16
9600
0
51
+0.16
19200
0
25
+0.16
31250
0
15
0
38400
0
12
+0.16
Note: If possible, the error should be within 1%.
340
Table 14.4 Examples of BRR Settings in Asynchronous Mode (When øP = ø/2)
ø (MHz)
2
2.4576
3
3.6864
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
1
70
0.03
1
86
0.31
1
106
–0.44
1
130
–0.07
150
1
51
0.16
1
63
0
1
77
0.16
1
95
0
300
0
103
0.16
0
255
0
1
38
0.16
1
47
0
600
0
51
0.16
0
127
0
0
77
0.16
0
95
0
1200
0
25
0.16
0
63
0
0
38
0.16
0
47
0
2400
0
12
0.16
0
31
0
0
19
–2.34
0
23
0
4800
—
—
—
0
15
0
0
9
–2.34
0
11
0
9600
—
—
—
0
7
0
0
4
–2.34
0
5
0
19200
—
—
—
0
3
0
—
—
—
0
2
0
31250
0
0
0
—
—
—
—
—
—
—
—
—
38400
—
—
—
0
1
0
—
—
—
—
—
—
ø (MHz)
4
4.9152
5
6
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
1
141
0.03
1
174
–0.26
1
177
–0.25
1
212
0.03
150
1
103
0.16
1
127
0
1
129
0.16
1
155
0.16
300
1
51
0.16
1
63
0
1
64
0.16
1
77
0.16
600
0
103
0.16
0
127
0
1
32
1.36
1
38
0.16
1200
0
51
0.16
0
63
0
0
64
0.16
0
77
0.16
2400
0
25
0.16
0
31
0
0
32
–1.36
0
38
0.16
4800
0
12
0.16
0
15
0
0
15
1.73
0
19
–2.34
9600
0
—
—
0
7
0
0
7
1.73
0
9
–2.34
19200
—
—
—
0
3
0
0
3
1.73
0
4
–2.34
31250
0
1
0
0
—
—
0
—
—
0
2
0
38400
—
—
—
0
1
0
0
1
1.73
—
—
—
341
Table 14.4 Examples of BRR Settings in Asynchronous Mode (When øP = ø/2) (cont)
ø (MHz)
6.144
7.3728
8
9.8304
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
1
217
0.08
2
64
0.70
2
70
0.03
2
86
0.31
150
1
159
0
1
191
0
1
207
0.16
1
255
0
300
1
79
0
1
95
0
1
103
0.16
1
127
0
600
1
39
0
1
47
0
1
51
0.16
1
63
0
1200
0
79
0
0
95
0
0
103
0.16
0
127
0
2400
0
39
0
0
47
0
0
51
0.16
0
63
0
4800
0
19
0
0
23
0
0
25
0.16
0
31
0
9600
0
9
0
0
11
0
0
12
0.16
0
31
0
19200
0
4
0
0
5
0
0
—
—
0
15
0
31250
0
2
2.40
—
—
—
0
3
0
0
9
–1.70
38400
—
—
—
0
2
0
—
—
—
0
3
0
ø (MHz)
10
12
12.288
14.7456
Bit Rate
(bits/s)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
n
N
Error
(%)
110
2
88
–0.25
2
106
–0.44
2
108
0.08
2
130
–0.07
150
2
64
0.16
2
77
0.16
2
79
0
2
95
0
300
1
129
0.16
1
155
0.16
1
159
0
1
191
0
600
1
64
0.16
1
77
0.16
1
79
0
1
95
0
1200
0
129
0.16
0
155
0.16
0
159
0
0
191
0
2400
0
64
0.16
0
77
0.16
0
79
0
0
95
0
4800
0
32
–1.36
0
38
0.16
0
39
0
0
47
0
9600
0
15
1.73
0
19
–2.34
0
19
0
0
23
0
19200
0
7
1.73
0
9
–2.34
0
9
0
0
11
0
31250
0
4
0
0
5
0
0
5
2.40
—
—
—
38400
0
3
1.73
0
4
–2.34
0
4
0
0
5
0
342
Table 14.4 Examples of BRR Settings in Asynchronous Mode (When øP = ø/2) (cont)
ø (MHz)
16
Bit Rate
(bits/s)
n
N
Error
(%)
110
2
141
0.03
150
2
103
0.16
300
1
207
0.16
600
1
103
0.16
1200
0
207
0.16
2400
0
103
0.16
4800
0
51
0.16
9600
0
25
0.16
19200
0
12
0.16
31250
0
7
0
38400
—
—
—
Legend:
Blank: No setting is available
—:
A setting is available, but error occurs.
343
Note: If possible, the error should be within 1%.
B=
B:
N:
F:
n:
F
64 ×
22n–1
× 106
× (N + 1)
N=
F
64 ×
22n–1
×B
Bit rate (bits/second)
Baud rate generator BRR value (0 ≤ N ≤ 255)
øP (MHz) when n ≠ 0, or ø (MHz) when n = 0
Baud rate generator input clock (n = 0, 1, 2, 3)
The meaning of n is given below.
SMR
WSCR
n
CKS1
CKS0
CKDBL
Clock
0
0
0
0
ø
1
0
1
0
ø/4
2
1
0
0
ø/16
3
1
1
0
ø/64
0
0
0
1
ø
1
0
1
1
ø/8
2
1
0
1
ø/32
3
1
1
1
ø/128
The bit rate error can be calculated with the formula below.
Error (%) =
344
F × 106
(N + 1) × B × 64 × 22n–1
– 1 × 100
× 106 – 1
Table 14.5 Examples of BRR Settings in Synchronous Mode (When øP = ø)
ø (MHz)
2
4
5
8
10
16
Bit Rate
(bits/s)
n
N
n
N
n
N
n
N
n
N
n
N
100
—
—
—
—
—
—
—
—
—
—
—
—
250
2
124
2
249
—
—
3
124
—
—
3
249
500
1
249
2
124
—
—
2
249
—
—
3
124
1k
1
124
1
249
—
—
2
124
—
—
2
249
2.5 k
0
199
1
99
1
124
1
199
1
249
2
99
5k
0
99
0
199
0
249
1
99
1
124
1
199
10 k
0
49
0
99
0
124
0
199
0
249
1
99
25 k
0
19
0
39
0
49
0
79
0
99
0
159
50 k
0
9
0
19
0
24
0
39
0
49
0
79
100 k
0
4
0
9
—
—
0
19
0
24
0
39
250 k
0
1
0
3
0
4
0
7
0
9
0
15
500 k
0
0*
0
1
—
—
0
3
0
4
0
7
0
0*
—
—
0
1
—
—
0
3
0
0*
—
—
0
0*
1M
2.5 M
4M
Legend
Blank: No setting is available
—:
A setting is available, but error occurs.
*:
Continuous transfer is not possible
345
Table 14.6 Examples of BRR Settings in Synchronous Mode (When øP = ø/2)
ø (MHz)
2
4
5
8
10
16
Bit Rate
(bits/s)
n
N
n
N
n
N
n
N
n
N
n
N
100
—
—
—
—
—
—
—
—
—
—
—
—
250
1
249
2
124
—
—
2
249
—
—
3
124
500
1
124
1
249
—
—
2
124
—
—
2
249
1k
—
—
1
124
—
—
1
249
—
—
2
124
2.5 k
0
99
1
49
—
—
1
99
1
124
1
199
5k
0
49
0
99
0
124
1
49
—
—
1
99
10 k
0
24
0
49
—
—
0
99
0
124
1
49
25 k
0
9
0
19
0
24
0
39
0
49
0
79
50 k
0
4
0
9
—
—
0
19
0
24
0
39
100 k
—
—
0
4
—
—
0
9
0
12
0
19
250 k
0
0*
0
1
—
—
0
3
0
4
0
7
500 k
—
—
—
0*
—
—
0
1
—
—
0
3
—
—
0
0
—
—
0
1
2.5 M
—
—
—
—
4M
—
—
1M
Legend
Blank: No setting is available
—:
A setting is available, but error occurs.
*:
Continuous transfer is not possible
346
B=
B:
N:
F:
n:
F
× 106
8 × 22n–1 × (N + 1)
N=
F
8 × 22n–1 × B
× 106 – 1
Bit rate (bits/second)
Baud rate generator BRR value (0 ≤ N ≤ 255)
øP (MHz) when n ≠ 0, or ø (MHz) when n = 0
Baud rate generator input clock (n = 0, 1, 2, 3)
The meaning of n is given below.
SMR
WSCR
n
CKS1
CKS0
CKDBL
Clock
0
0
0
0
ø
1
0
1
0
ø/4
2
1
0
0
ø/16
3
1
1
0
ø/64
0
0
0
1
ø
1
0
1
1
ø/8
2
1
0
1
ø/32
3
1
1
1
ø/128
347
14.2.9
Serial/Timer Control Register (STCR)
Bit
7
6
5
4
3
2
1
0
RING
CMPF
CMPIE
LOAD
MARK
—
ICKS1
ICKS0
Initial value
0
0
0
1
1
1
0
0
Read/Write
R/W
R/(W)*
R/W
(W)
(W)
—
R/W
R/W
Note: * Software can write a 0 in bit 6 to clear the flag, but cannot write a 1 in this bit.
STCR is an 8-bit readable/writable register that controls the SCI operating mode, selects the
TCNT clock source in the 8-bit timers, and controls DTU channel B. STCR is initialized to H'1C
by a reset.
Bits 7 to 3—DTU Channel B Control: These bits control DTU channel B. For details, see
section 5, Data Transfer Unit.
Bit 2—Reserved: This bit cannot be modified and is always read as 1.
Bits 1 and 0—Internal Clock Source Select 1 and 0 (ICKS1, ICKS0): These bits select the
clock input to the timer counters (TCNT) in the 8-bit timers. For details, see section 11.2.3, Timer
Control Register.
14.2.10
Serial Communication Mode Register (SCMR)
Bit
7
6
5
4
3
2
1
0
—
—
—
—
SDIR
SINV
—
SMIF
Initial value
1
1
1
1
0
0
1
0
Read/Write
—
—
—
—
R/W
R/W
—
R/W
SCMR is an 8-bit readable/writable register that selects the SCI0 interface function.
SCMR is initialized to H'F2 by a reset and in the standby modes.
Bits 7 to 4—Reserved: These bits cannot be modified and are always read as 1.
348
Bit 3—Data Transfer Direction (SDIR): Selects the serial/parallel conversion format.
Bit 3
SDIR
0
Description
TDR contents are transmitted LSB-first.
(Initial value)
Receive data is stored in RDR LSB-first.
1
TDR contents are transmitted MSB-first.
Receive data is stored in RDR MSB-first.
Bit 2—Data Invert (SINV): Specifies inversion of the data logic level. Inversion by the SINV bit
applies only to data bits D7 to D0. To invert the parity bit, the O/E bit in SMR must be inverted.
Bit 2
SINV
0
Description
TDR contents are transmitted as they are.
(Initial value)
Receive data is stored in RDR as it is.
1
TDR contents are inverted before being transmitted.
Receive data is stored in RDR in inverted form.
Bit 1—Reserved: This bit cannot be modified and is always read as 1.
Bit 0—Serial Communication Mode Select (SMIF): This bit is reserved, and should not be
written with 1.
Bit 0
SMIF
Description
0
Normal SCI mode
1
Reserved mode
(Initial value)
349
14.3
Operation
14.3.1
Overview
The SCI supports serial data transfer in two modes. In asynchronous mode each character is
synchronized individually. In synchronous mode communication is synchronized with a clock
signal.
The selection of asynchronous or synchronous mode and the communication format depend on
SMR settings as indicated in table 14.7. The clock source depends on the settings of the C/A bit in
SMR and the CKE1 and CKE0 bits in SCR as indicated in table 14.8.
Asynchronous Mode
• Data length: 7 or 8 bits can be selected.
• A parity bit or multiprocessor bit can be added, and stop bit lengths of 1 or 2 bits can be
selected. (These selections determine the communication format and character length.)
• Framing errors (FER), parity errors (PER), and overrun errors (ORER) can be detected in
receive data, and the line-break condition can be detected.
• SCI clock source: An internal or external clock source can be selected.
 Internal clock: The SCI is clocked by the on-chip baud rate generator and can output a
clock signal at the bit-rate frequency.
 External clock: The external clock frequency must be 16 times the bit rate. (The on-chip
baud rate generator is not used.)
Synchronous Mode
• Communication format: The data length is 8 bits.
• Overrun errors (ORER) can be detected in receive data.
• SCI clock source: An internal or external clock source can be selected.
 Internal clock: The SCI is clocked by the on-chip baud rate generator and outputs a serial
clock signal to external devices.
 External clock: The on-chip baud rate generator is not used. The SCI operates on the input
serial clock.
350
Table 14.7 Communication Formats Used by SCI
SMR Settings
Communication Format
Bit 7 Bit 6 Bit 2 Bit 5 Bit 3
C/A CHR MP
PE
STOP Mode
Data
MultiproParity
Length cessor Bit Bit
Stop Bit
Length
0
8 bits
1 bit
0
0
0
0
Asynchronous mode
None
None
1
1
2 bits
0
Present 1 bit
1
1
0
2 bits
0
7 bits
None
1
1
2 bits
0
Present 1 bit
1
0
1
—
1
2 bits
0
Asynchronous mode
1
(multiprocessor
0
format)
8 bits
Present
None
—
—
—
—
1 bit
2 bits
7 bits
1 bit
1
1
1 bit
2 bits
Synchronous mode
8 bits
None
None
Table 14.8 SCI Clock Source Selection
SMR
SCR
Serial Transmit/Receive Clock
Bit 7
C/A
Bit 1
CKE1
Bit 0
CKE0
Mode
Clock Source
SCK Pin Function
0
0
0
Async
Internal
Input/output port (not used by SCI)
1
1
Serial clock output at bit rate
0
External
Serial clock input at 16 × bit rate
Internal
Serial clock output
External
Serial clock input
1
1
0
0
Sync
1
1
0
1
351
14.3.2
Asynchronous Mode
In asynchronous mode, each transmitted or received character is individually synchronized by
framing it with a start bit and stop bit.
Full duplex data transfer is possible because the SCI has independent transmit and receive
sections. Double buffering in both sections enables the SCI to be programmed for continuous data
transfer.
Figure 14.2 shows the general format of one character sent or received in asynchronous mode.
The communication channel is normally held in the mark state (high). Character transmission or
reception starts with a transition to the space state (low).
The first bit transmitted or received is the start bit (low). It is followed by the data bits, in which
the least significant bit (LSB) comes first. The data bits are followed by the parity or
multiprocessor bit, if present, then the stop bit or bits (high) confirming the end of the frame.
In receiving, the SCI synchronizes on the falling edge of the start bit, and samples each bit at the
center of the bit (at the 8th cycle of the internal serial clock, which runs at 16 times the bit rate).
1
(LSB)
0
D0
Idle state
(mark)
1
(MSB)
D1
D2
D3
D4
D5
Start
bit
D6
D7
0/1
Parity
bit
1
1
Stop bit
Transmit/receive data
1 bit
7 or 8 bits
0 or
1 bit
1 or
2 bits
One unit of transfer data (one character or frame)
Figure 14.2 Data Format in Asynchronous Mode
(Example of 8-Bit Data with Parity Bit and Two Stop Bits)
352
Data Format: Table 14.9 lists the data formats that can be sent and received in asynchronous
mode. Twelve formats can be selected by bits in the serial mode register.
Table 14.9 Data Formats in Asynchronous Mode
SMR Bits
CHR
PE
MP
STOP
1
0
0
0
0
S
8-bit data
STOP
0
0
0
1
S
8-bit data
STOP STOP
0
1
0
0
S
8-bit data
P
STOP
0
1
0
1
S
8-bit data
P
STOP STOP
1
0
0
0
S
7-bit data
STOP
1
0
0
1
S
7-bit data
STOP STOP
1
1
0
0
S
7-bit data
P
STOP
1
1
0
1
S
7-bit data
P
STOP STOP
0
—
1
0
S
8-bit data
MPB STOP
0
—
1
1
S
8-bit data
MPB STOP STOP
1
—
1
0
S
7-bit data
MPB STOP
1
—
1
1
S
7-bit data
MPB STOP STOP
Notes: SMR:
S:
STOP:
P:
MPB:
2
3
4
5
6
7
8
9
10
11
12
Serial mode register
Start bit
Stop bit
Parity bit
Multiprocessor bit
353
Clock: In asynchronous mode it is possible to select either an internal clock created by the on-chip
baud rate generator, or an external clock input at the SCK pin. The selection is made by the C/A
bit in the serial mode register (SMR) and the CKE1 and CKE0 bits in the serial control register
(SCR). Refer to table 14.8.
If an external clock is input at the SCK pin, its frequency should be 16 times the desired bit rate.
If the internal clock provided by the on-chip baud rate generator is selected and the SCK pin is
used for clock output, the output clock frequency is equal to the bit rate, and the clock pulse rises
at the center of the transmit data bits. Figure 14.3 shows the phase relationship between the output
clock and transmit data.
0
D0
D1
D2
D3
D4
D5
D6
D7
0/1
1
1
One frame
Figure 14.3 Phase Relationship between Clock Output and Transmit Data
(Asynchronous Mode)
Transmitting and Receiving Data
• SCI Initialization: Before transmitting or receiving, software must clear the TE and RE bits to
0 in the serial control register (SCR), then initialize the SCI as follows.
Note: When changing the communication mode or format, always clear the TE and RE bits to 0
before following the procedure given below. Clearing TE to 0 sets TDRE to 1 and
initializes the transmit shift register (TSR). Clearing RE to 0, however, does not initialize
the RDRF, PER, FER, and ORER flags and receive data register (RDR), which retain their
previous contents.
When an external clock is used, the clock should not be stopped during initialization or
subsequent operation. SCI operation becomes unreliable if the clock is stopped.
354
Initialization
1.
Select interrupts and the clock source in the
serial control register (SCR). Leave TE and RE
cleared to 0. If clock output is selected, in
asynchronous mode, clock output starts
immediately after the setting is made in SCR.
2.
Select the communication format in the serial
mode register (SMR).
3.
Write the value corresponding to the bit rate in
the bit rate register (BRR). This step is not
necessary when an external clock is used.
4.
Wait for at least the interval required to transmit
or receive one bit, then set TE or RE in the serial
control register (SCR). Setting TE or RE enables
the SCI to use the TxD or RxD pin.
Also set the RIE, TIE, TEIE, and MPIE bits as
necessary to enable interrupts. The initial states
are the mark transmit state, and the idle receive
state (waiting for a start bit).
Clear TE and RE bits to 0
in SCR
1
Set CKE1 and CKE0 bits
in SCR
(leaving TE and RE cleared
to 0)
2
Select communication
format in SMR
3
Set value in BRR
1 bit interval
elapsed?
No
Yes
4
Set TE or RE to 1 in SCR,
and set RIE, TIE, TEIE, and
MPIE as necessary
Start transmitting or receiving
Figure 14.4 Sample Flowchart for SCI Initialization
355
• Transmitting Serial Data: Follow the procedure below for transmitting serial data.
1
Initialize
1.
SCI initialization: the transmit data output function
of the TxD pin is selected automatically.
Transmit become available 1 frame term after TE
bit is set.
2.
SCI status check and transmit data write: read
the serial status register (SSR), check that the
TDRE bit is 1, then write transmit data in the
transmit data register (TDR) and clear TDRE to 0.
If a multiprocessor format is selected, after
writing the transmit data write 0 or 1 in the
multiprocessor bit transfer (MPBT) in SSR.
Transition of the TDRE bit from 0 to 1 can be
reported by an interrupt.
Start transmitting
2
Read TDRE bit in SSR
No
TDRE = 1?
Yes
Write transmit data in TDR
If using multiprocessor format,
select MPBT value in SSR
Clear TDRE bit to 0
Serial transmission
3
End of
transmission?
No
Yes
3. (a) To continue transmitting serial data: read the
TDRE bit to check whether it is safe to write; if
TDRE = 1, write data in TDR, then clear TDRE
to 0.
(b) To end serial transmission: end of transmission
can be confirmed by checking transition of the
TEND bit from 0 to 1. This can be reported by
a TEI interrupt.
4.
To output a break signal at the end of serial
transmission: set the DDR bit to 1 and clear the
DR bit to 0 (DDR and DR are I/O port registers),
then clear TE to 0 in SCR.
Read TEND bit in SSR
TEND = 1?
No
Yes
4
Output break
signal?
No
Yes
Set DR = 0, DDR = 1
Clear TE bit in SCR to 0
End
Figure 14.5 Sample Flowchart for Transmitting Serial Data
356
In transmitting serial data, the SCI operates as follows.
1. The SCI monitors the TDRE bit in SSR. When TDRE is cleared to 0 the SCI recognizes that
the transmit data register (TDR) contains new data, and loads this data from TDR into the
transmit shift register (TSR).
2. After loading the data from TDR into TSR, the SCI sets the TDRE bit to 1 and starts
transmitting. If the TIE bit (TDR-empty interrupt enable) is set to 1 in SCR, the SCI requests a
TXI interrupt (TDR-empty interrupt) at this time.
Serial transmit data is transmitted in the following order from the TxD pin:
a. Start bit: One 0 bit is output.
b. Transmit data: Seven or eight bits are output, LSB first.
c. Parity bit or multiprocessor bit: One parity bit (even or odd parity) or one multiprocessor
bit is output. Formats in which neither a parity bit nor a multiprocessor bit is output can
also be selected.
d. Stop bit: One or two 1 bits (stop bits) are output.
e. Idle state: Output of 1 bits continues until the start bit of the next transmit data.
3. The SCI checks the TDRE bit when it outputs the stop bit. If TDRE is 0, after loading new data
from TDR into TSR and transmitting the stop bit, the SCI begins serial transmission of the next
frame. If TDRE is 1, after setting the TEND bit to 1 in SSR and transmitting the stop bit, the
SCI continues 1-level output in the mark state, and if the TEIE bit (TSR-empty interrupt
enable) in SCR is set to 1, the SCI generates a TEI interrupt request (TSR-empty interrupt).
357
Figure 14.6 shows an example of SCI transmit operation in asynchronous mode.
1
Start
bit
0
Parity Stop Start
bit
bit bit
Data
D0
D1
D7
0/1
1
0
Parity Stop
bit
bit
Data
D0
D1
D7
0/1
1
TDRE
TEND
TXI
TXI interrupt handler
request writes data in TDR and
clears TDRE to 0
TXI
request
TEI request
1 frame
Figure 14.6 Example of SCI Transmit Operation
(8-Bit Data with Parity and One Stop Bit)
358
1
Idle state
(mark)
• Receiving Serial Data: Follow the procedure below for receiving serial data.
1
1. SCI initialization: the receive data function of
the RxD pin is selected automatically.
Initialize
Yes
2. Receive error handling and break detection: if
a receive error occurs, read the ORER, PER,
and FER bits in SSR to identify the error.
After executing the necessary error handling,
clear ORER, PER, and FER all to 0.
Transmitting and receiving cannot resume if
ORER, PER, or FER remains set to 1.
When a framing error occurs, the RxD pin can
be read to detect the break state.
No
3. SCI status check and receive data read: read
the serial status register (SSR), check that
RDRF is set to 1, then read receive data from
the receive data register (RDR) and clear
RDRF to 0. Transition of the RDRF bit from 0
to 1 can be reported by an RXI interrupt.
Start receiving
Read ORER, PER, and
FER in SSR
PER ∨ RER ∨
ORER = 1?
No
3
2
Read RDRF bit in SSR
RDRF = 1?
Error handling
4. To continue receiving serial data: read RDR
and clear RDRF to 0 before the stop bit of the
current frame is received.
Yes
4
Read receive data from RDR,
and clear RDRF bit to 0
in SSR
Finished
receiving?
No
Yes
Clear RE to 0 in SCR
End
Start error handling
FER = 1?
No
Discriminate and
process error, and
clear flags
Yes
Break?
Yes
No
Clear RE to 0
in SCR
Return
Return
Figure 14.7 Sample Flowchart for Receiving Serial Data
359
In receiving, the SCI operates as follows.
1. The SCI monitors the receive data line and synchronizes internally when it detects a start bit.
2. Receive data is shifted into RSR in order from LSB to MSB.
3. The parity bit and stop bit are received.
After receiving these bits, the SCI makes the following checks:
a. Parity check: The number of 1s in the receive data must match the even or odd parity
setting of the O/E bit in SMR.
b. Stop bit check: The stop bit value must be 1. If there are two stop bits, only the first stop bit
is checked.
c. Status check: RDRF must be 0 so that receive data can be loaded from RSR into RDR.
If these checks all pass, the SCI sets RDRF to 1 and stores the received data in RDR. If one of
the checks fails (receive error), the SCI operates as indicated in table 14.10.
Note: When a receive error flag is set, further receiving is disabled. The RDRF bit is not set
to 1. Be sure to clear the error flags.
4. After setting RDRF to 1, if the RIE bit (receive-end interrupt enable) is set to 1 in SCR, the
SCI requests an RXI (receive-end) interrupt. If one of the error flags (ORER, PER, or FER) is
set to 1 and the RIE bit in SCR is also set to 1, the SCI requests an ERI (receive-error)
interrupt.
Figure 14.8 shows an example of SCI receive operation in asynchronous mode.
Table 14.10 Receive Error Conditions and SCI Operation
Receive Error
Abbreviation
Condition
Data Transfer
Overrun error
ORER
Receiving of next data ends
while RDRF is still set to 1
in SSR
Receive data not loaded from
RSR into RDR
Framing error
FER
Stop bit is 0
Receive data loaded from
RSR into RDR
Parity error
PER
Parity of receive data differs
from even/odd parity setting
in SMR
Receive data loaded from
RSR into RDR
360
1
Start
bit
0
Parity Stop Start
bit
bit bit
Data
D0
D1
D7
0/1
1
0
Parity Stop
bit
bit
Data
D0
D1
D7
0/1
0
1
Idle state
(mark)
RDRF
FER
RXI
request
1 frame
RXI interrupt handler
reads data in RDR and
clears RDRF to 0
Framing error,
ERI request
Figure 14.8 Example of SCI Receive Operation (8-Bit Data with Parity and One Stop Bit)
Multiprocessor Communication: The multiprocessor communication function enables several
processors to share a single serial communication line. The processors communicate in
asynchronous mode using a format with an additional multiprocessor bit (multiprocessor format).
In multiprocessor communication, each receiving processor is addressed by an ID.
A serial communication cycle consists of two cycles: an ID-sending cycle that identifies the
receiving processor, and a data-sending cycle. The multiprocessor bit distinguishes ID-sending
cycles from data-sending cycles.
The transmitting processor starts by sending the ID of the receiving processor with which it wants
to communicate as data with the multiprocessor bit set to 1. Next the transmitting processor sends
transmit data with the multiprocessor bit cleared to 0.
Receiving processors skip incoming data until they receive data with the multiprocessor bit set to
1.
After receiving data with the multiprocessor bit set to 1, the receiving processor with an ID
matching the received data continues to receive further incoming data. Multiple processors can
send and receive data in this way.
Four formats are available. Parity-bit settings are ignored when a multiprocessor format is
selected. For details see table 14.9.
361
Transmitting
processor
Serial communication line
Receiving
processor A
Receiving
processor B
Receiving
processor C
Receiving
processor D
(ID = 01)
(ID = 02)
(ID = 03)
(ID = 04)
Serial data
H'01
(MPB = 1)
ID-sending cycle:
receiving processor address
H'AA
(MPB = 0)
Data-sending cycle:
data sent to receiving
processor specified by ID
MPB: Multiprocessor bit
Figure 14.9 Example of Communication among Processors using Multiprocessor Format
(Sending Data H'AA to Receiving Processor A)
• Transmitting Multiprocessor Serial Data: See figures 14.5 and 14.6.
362
• Receiving Multiprocessor Serial Data: Follow the procedure below for receiving
multiprocessor serial data.
1
2
Initialize
1.
SCI initialization: the receive data function of the RxD pin is
selected automatically.
Start receiving
2.
ID receive cycle: Set the MPIE bit in the serial control register
(SCR) to 1.
3.
SCI status check and ID check: read the serial status register
(SSR), check that RDRF is set to 1, then read receive data
from the receive data register (RDR) and compare with the
processor’s own ID. Transition of the RDRF bit from 0 to
1 can be reported by an RXI interrupt. If the ID does not match
the receive data, set MPIE to 1 again and clear RDRF to 0.
If the ID matches the receive data, clear RDRF to 0.
4.
SCI status check and data receiving: read SSR, check that
RDRF is set to 1, then read data from the receive data register
(RDR) and write 0 in the RDRF bit. Transition of the RDRF bit
from 0 to 1 can be reported by an RXI interrupt.
5.
Receive error handling and break detection: if a receive error
occurs, read the ORER and FER bits in SSR to identify the error.
After executing the necessary error handling, clear both ORER
and FER to 0. Receiving cannot resume while ORER or FER
remains set to 1. When a framing error occurs, the RxD pin
can be read to detect the break state.
Set MPIE bit to 1 in SCR
Read ORER and FER
bits in SSR
FER ∨
ORER = 1?
Yes
No
3
Read RDRF bit in SSR
No
RDRF = 1?
Yes
Read receive data from RDR
Own ID?
No
Yes
Read ORER and FER
bits in SSR
FER +
ORER = 1?
Yes
No
4
Read RDRF bit in SSR
RDRF = 1?
No
Start error handling
Yes
Read receive data from RDR
5
Error handling
Finished
receiving?
Yes
Clear RE to 0 in SCR
No
FER = 1?
No
Discriminate and
process error, and
clear flags
Yes
Break?
Yes
No
Clear RE bit to
0 in SCR
Return
End
Return
Figure 14.10 Sample Flowchart for Receiving Multiprocessor Serial Data
363
Figure 14.11 shows an example of an SCI receive operation using a multiprocessor format (8-bit
data with multiprocessor bit and one stop bit).
1
Start
bit
0
Stop Start
MPB bit bit
Data (ID1)
D0
D1
D7
1
1
0
Data (Data1)
D0
D1
D7
Stop
MPB bit
0
1
1
Idle state
(mark)
MPIE
RDRF
RDR value
ID1
RXI request,
MPIE = 0
RXI handler reads
RDR data and clears
RDRF to 0
Not own ID, so
MPIE is set to
1 again
No RXI request,
RDR not updated
(Multiprocessor interrupt)
(a) Own ID does not match data
1
Start
bit
0
Stop Start
MPB bit bit
Data (ID2)
D0
D1
D7
1
1
0
Data (Data2)
D0
D1
D7
Stop
MPB bit
0
1
1
Idle state
(mark)
MPIE
RDRF
RDR value
ID1
ID2
RXI request,
MPIE = 0
RXI handler reads
Own ID, so receiving
RDR data and clears continues, with data
RDRF to 0
received at each RXI
(Multiprocessor interrupt)
(b) Own ID matches data
Figure 14.11 Example of SCI Receive Operation
(Eight-Bit Data with Multiprocessor Bit and One Stop Bit)
364
Data 2
MPIE set to
1 again
14.3.3
Synchronous Mode
Overview: In synchronous mode, the SCI transmits and receives data in synchronization with
clock pulses. This mode is suitable for high-speed serial communication.
The SCI transmitter and receiver share the same clock but are otherwise independent, so full
duplex communication is possible. The transmitter and receiver are also double buffered, so
continuous transmitting or receiving is possible by reading or writing data while transmitting or
receiving is in progress.
Figure 14.12 shows the general format in synchronous serial communication.
One unit (character or frame) of serial data
*
*
Serial clock
LSB
Serial data
Bit 0
MSB
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Don’t care
Don’t care
Note: * High except in continuous transmitting or receiving
Figure 14.12 Data Format in Synchronous Communication
In synchronous serial communication, each data bit is sent on the communication line from one
falling edge of the serial clock to the next. Data is received in synchronization with the rising edge
of the serial clock.
In each character, the serial data bits are transmitted in order from LSB (first) to MSB (last). After
output of the MSB, the communication line remains in the state of the MSB.
• Communication Format: The data length is fixed at eight bits. No parity bit or multiprocessor
bit can be added.
• Clock: An internal clock generated by the on-chip baud rate generator or an external clock
input from the SCK pin can be selected by clearing or setting the CKE1 bit in the serial control
register (SCR). See table 14.8.
When the SCI operates on an internal clock, it outputs the clock signal at the SCK pin. Eight clock
pulses are output per transmitted or received character. When the SCI is not transmitting or
receiving, the clock signal remains at the high level.
365
Transmitting and Receiving Data
• SCI Initialization: The SCI must be initialized in the same way as in asynchronous mode. See
figure 14.4. When switching from asynchronous mode to synchronous mode, check that the
ORER, FER, and PER bits are cleared to 0. Transmitting and receiving cannot begin if ORER,
FER, or PER is set to 1.
• Transmitting Serial Data: Follow the procedure below for transmitting serial data.
1
Initialize
Start transmitting
2
Read TDRE bit in SSR
No
TDRE = 1?
Yes
Write transmit data in
TDR and clear TDRE bit to
0 in SSR
1.
SCI initialization: the transmit data output function
of the TxD pin is selected automatically.
2.
SCI status check and transmit data write: read
the serial status register (SSR), check that the
TDRE bit is 1, then write transmit data in the
transmit data register (TDR) and clear TDRE to 0.
Transition of the TDRE bit from 0 to 1 can be
reported by a TXI interrupt.
3. (a) To continue transmitting serial data: read the
TDRE bit to check whether it is safe to write; if
TDRE = 1, write data in TDR, then clear TDRE
to 0.
(b) To end serial transmission: end of transmission
can be confirmed by checking transition of the
TEND bit from 0 to 1. This can be reported by
a TEI interrupt.
Serial transmission
3
End of
transmission?
No
Yes
Read TEND bit in SSR
TEND = 1?
No
Yes
Clear TE bit to 0 in SCR
End
Figure 14.13 Sample Flowchart for Serial Transmitting
366
In transmitting serial data, the SCI operates as follows.
1. The SCI monitors the TDRE bit in SSR. When TDRE is cleared to 0 the SCI recognizes that
the transmit data register (TDR) contains new data, and loads this data from TDR into the
transmit shift register (TSR).
2. After loading the data from TDR into TSR, the SCI sets the TDRE bit to 1 and starts
transmitting. If the TIE bit (TDR-empty interrupt enable) in SCR is set to 1, the SCI requests a
TXI interrupt (TDR-empty interrupt) at this time.
If clock output is selected the SCI outputs eight serial clock pulses, triggered by the clearing of
the TDRE bit to 0. If an external clock source is selected, the SCI outputs data in
synchronization with the input clock.
Data is output from the TxD pin in order from LSB (bit 0) to MSB (bit 7).
3. The SCI checks the TDRE bit when it outputs the MSB (bit 7). If TDRE is 0, the SCI loads
data from TDR into TSR, then begins serial transmission of the next frame. If TDRE is 1, the
SCI sets the TEND bit in SSR to 1, transmits the MSB, then holds the output in the MSB state.
If the TEIE bit (transmit-end interrupt enable) in SCR is set to 1, a TEI interrupt (TSR-empty
interrupt) is requested at this time.
4. After the end of serial transmission, the SCK pin is held at the high level.
Figure 14.14 shows an example of SCI transmit operation.
Serial clock
Serial data
Bit 0
Bit 1
Bit 7
Bit 0
Bit 1
Bit 6
Bit 7
TDRE
TEND
TXI interrupt
handler writes
data in TDR and
clears TDRE to 0
TXI
request
TEI
request
1 frame
Figure 14.14 Example of SCI Transmit Operation
367
• Receiving Serial Data: Follow the procedure below for receiving serial data. When switching
from asynchronous mode to synchronous mode, be sure to check that PER and FER are cleared to
0. If PER or FER is set to 1 the RDRF bit will not be set and both transmitting and receiving will
be disabled.
1
1. SCI initialization: the receive data function of the
RxD pin is selected automatically.
Initialize
Start receiving
Read ORER bit in SSR
Yes
ORER = 1?
No
3
Read RDRF bit in SSR
RDRF = 1?
No
Yes
4
Read receive data
from RDR, and clear
RDRF bit to 0 in SSR
Finished
receiving?
2. Receive error handling: if a receive error occurs,
read the ORER bit in SSR then, after executing
the necessary error handling, clear ORER to 0.
Neither transmitting nor receiving can resume
while ORER remains set to 1. When clock
output mode is selected, receiving can be halted
temporarily by receiving one dummy byte and
causing an overrun error. When preparations to
2
receive the next data are completed, clear the
ORER bit to 0. This causes receiving to
Error handling
resume, so return to the step marked 2 in the
flowchart.
3. SCI status check and receive data read: read
the serial status register (SSR), check that
RDRF is set to 1, then read receive data from
the receive data register (RDR) and clear RDRF
to 0. Transition of the RDRF bit from 0 to 1 can
be reported by an RXI interrupt.
4. To continue receiving serial data: read RDR and
clear RDRF to 0 before the MSB (bit 7) of the
current frame is received.
No
Yes
Clear RE to 0 in SCR
End
Start error handling
Overrun error handling
Clear ORER to 0 in SSR
Return
Figure 14.15 Sample Flowchart for Serial Receiving
368
In receiving, the SCI operates as follows.
1. If an external clock is selected, data is input in synchronization with the input clock. If clock
output is selected, as soon as the RE bit is set to 1 the SCI begins outputting the serial clock
and inputting data. If clock output is stopped because the ORER bit is set to 1, output of the
serial clock and input of data resume as soon as the ORER bit is cleared to 0.
2. Receive data is shifted into RSR in order from LSB to MSB.
After receiving the data, the SCI checks that RDRF is 0 so that receive data can be loaded from
RSR into RDR. If this check passes, the SCI sets RDRF to 1 and stores the received data in
RDR. If the check does not pass (receive error), the SCI operates as indicated in
table 14.8.
Note: Both transmitting and receiving are disabled while a receive error flag is set. The
RDRF bit is not set to 1. Be sure to clear the error flag.
3. After setting RDRF to 1, if the RIE bit (receive-end interrupt enable) is set to 1 in SCR, the
SCI requests an RXI (receive-end) interrupt. If the ORER bit is set to 1 and the RIE bit in SCR
is set to 1, the SCI requests an ERI (receive-error) interrupt.
When clock output mode is selected, clock output stops when the RE bit is cleared to 0 or the
ORER bit is set to 1. To prevent clock count errors, it is safest to receive one dummy byte and
generate an overrun error.
Figure 14.16 shows an example of SCI receive operation.
Serial clock
Serial data
Bit 0
Bit 1
Bit 7
Bit 0
Bit 1
Bit 6
Bit 7
RDRF
ORER
RXI
request
RXI interrupt
RXI
handler reads
request
data in RDR and
clears RDRF to 0
Overrun error,
ERI request
1 frame
Figure 14.16 Example of SCI Receive Operation
369
• Transmitting and Receiving Serial Data Simultaneously: Follow the procedure below for
transmitting and receiving serial data simultaneously. If clock output mode is selected, output of
the serial clock begins simultaneously with serial transmission.
1
1. SCI initialization: the transmit data output function of the
TxD pin and receive data input function of the RxD pin
are selected, enabling simultaneous transmitting and
receiving.
Initialize
Start
2
2. SCI status check and transmit data write: read the serial
status register (SSR), check that the TDRE bit is 1, then
write transmit data in the transmit data register (TDR)
and clear TDRE to 0. Transition of the TDRE bit from 0
to 1 can be reported by a TXI interrupt.
Read TDRE bit in SSR
No
TDRE = 1?
3. SCI status check and receive data read: read the serial
status register (SSR), check that the RDRF bit is 1, then
read receive data from the receive data register (RDR)
and clear RDRF to 0. Transition of the RDRF bit from 0
to 1 can be reported by an RXI interrupt.
Yes
Write transmit data
in TDR and clear TDRE
bit to 0 in SSR
3
4. Receive error handling: if a receive error occurs, read
the ORER bit in SSR then, after executing the necessary
error handling, clear ORER to 0. Neither transmitting
nor receiving can resume while ORER remains set to 1.
Read ORER bit in SSR
ORER = 1?
Yes
4
No
Error handling
Read RDRF bit in SSR
No
5. To continue transmitting and receiving serial data: read
RDR and clear RDRF to 0 before the MSB (bit 7) of the
current frame is received. Also read the TDRE bit and
check that it is set to 1, indicating that it is safe to write;
then write data in TDR and clear TDRE to 0 before the
MSB (bit 7) of the current frame is transmitted.
RDRF = 1?
Yes
5
Read receive data
from RDR and clear
RDRF bit to 0 in SSR
End of
transmitting and
receiving?
No
Yes
Clear TE and RE bits
to 0 in SCR
End
Figure 14.17 Sample Flowchart for Serial Transmitting and Receiving
Note: In switching from transmitting or receiving to simultaneous transmitting and receiving,
clear both TE and RE to 0, then set both TE and RE to 1.
Do not use the BSET instruction for this purpose.
370
14.4
Interrupts
The SCI can request four types of interrupts: ERI, RXI, TXI, and TEI. Table 14.11 indicates the
source and priority of these interrupts. The interrupt sources can be enabled or disabled by the
TIE, RIE, and TEIE bits in the SCR. Independent signals are sent to the interrupt controller for
each interrupt source, except that the receive-error interrupt (ERI) is the logical OR of three
sources: overrun error, framing error, and parity error.
The TXI interrupt indicates that the next transmit data can be written. The TEI interrupt indicates
that the SCI has stopped transmitting data.
Table 14.11
SCI Interrupt Sources
Interrupt
Description
Priority
ERI
Receive error interrupt (ORER, FER, or PER)
High
RXI
Receive end interrupt (RDRF)
TXI
TDR-empty interrupt (TDRE)
TEI
TSR-empty interrupt (TEND)
Low
371
14.5
Application Notes
Application programmers should note the following features of the SCI.
TDR Write: The TDRE bit in SSR is simply a flag that indicates that the TDR contents have been
transferred to TSR. The TDR contents can be rewritten regardless of the TDRE value. If a new
byte is written in TDR while the TDRE bit is 0, before the old TDR contents have been moved
into TSR, the old byte will be lost. Software should check that the TDRE bit is set to 1 before
writing to the TDR.
Multiple Receive Errors: Table 14.12 lists the values of flag bits in the SSR when multiple
receive errors occur, and indicates whether the RSR contents are transferred to RDR.
Table 14.12 SSR Bit States and Data Transfer when Multiple Receive Errors Occur
SSR Bits
Receive error
RDRF
ORER
FER
PER
RSR →
RDR*2
Overrun error
1* 1
1
0
0
No
Framing error
0
0
1
0
Yes
Parity error
0
0
0
1
Yes
1*
1
1
1
0
No
Overrun and parity errors
1*
1
1
0
1
No
Framing and parity errors
0
0
1
1
Yes
1
1
1
No
Overrun and framing errors
Overrun, framing, and parity errors
1*
1
Notes: 1. Set to 1 before the overrun error occurs.
2. Yes: The RSR contents are transferred to RDR.
No: The RSR contents are not transferred to RDR.
Line Break Detection: When the RxD pin receives a continuous stream of 0’s in asynchronous
mode (line-break state), a framing error occurs because the SCI detects a 0 stop bit. The value
H'00 is transferred from RSR to RDR. Software can detect the line-break state as a framing error
accompanied by H'00 data in RDR.
The SCI continues to receive data, so if the FER bit is cleared to 0 another framing error will
occur.
372
Sampling Timing and Receive Margin in Asynchronous Mode: The serial clock used by the
SCI in asynchronous mode runs at 16 times the bit rate. The falling edge of the start bit is detected
by sampling the RxD input on the falling edge of this clock. After the start bit is detected, each bit
of receive data in the frame (including the start bit, parity bit, and stop bit or bits) is sampled on
the rising edge of the serial clock pulse at the center of the bit. See figure 14.18.
It follows that the receive margin can be calculated as in equation (1).
When the absolute frequency deviation of the clock signal is 0 and the clock duty cycle is 0.5, data
can theoretically be received with distortion up to the margin given by equation (2). This is a
theoretical limit, however. In practice, system designers should allow a margin of 20% to 30%.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1516 1 2 3 4 5 6 7 8 9 10 11 12 1314 15 16 1 2 3 4 5
Basic
clock
–7.5 pulses
Receive
data
Start bit
+7.5 pulses
D0
D1
Sync
sampling
Data
sampling
Figure 14.18 Sampling Timing (Asynchronous Mode)
M=
M:
N:
D:
L:
F:
0.5 –
1
D – 0.5
–
– (L – 0.5) F
2N
N
× 100 [%] .................... (1)
Receive margin
Ratio of basic clock to bit rate (N=16)
Duty factor of clock—ratio of high pulse width to low width (0.5 to 1.0)
Frame length (9 to 12)
Absolute clock frequency deviation
When D = 0.5 and F = 0
M = (0.5 – 1/2 × 16) × 100 [%] = 46.875% ......................................... (2)
373
Section 15 A/D Converter
15.1
Overview
The H8/3318 includes a 10-bit successive-approximations A/D converter with a selection of up to
eight analog input channels.
15.1.1
Features
A/D converter features are listed below.
• 10-bit resolution
• Eight input channels
• High-speed conversion
Conversion time: minimum 8.4 µs per channel (with 16-MHz system clock)
• Two conversion modes
Single mode: A/D conversion of one channel
Scan mode: continuous conversion on one to four channels
• Four 16-bit data registers
A/D conversion results are transferred for storage into data registers corresponding to the
channels.
• Sample-and-hold function
• A/D conversion can be externally triggered
• A/D interrupt requested at end of conversion
At the end of A/D conversion, an A/D end interrupt (ADI) can be requested.
375
15.1.2
Block Diagram
Figure 15.1 shows a block diagram of the A/D converter.
On-chip
data bus
AN 0
AN 5
ADCR
ADCSR
ADDRD
–
AN 2
AN 4
ADDRC
+
AN 1
AN 3
ADDRB
AVSS
ADDRA
10-bit D/A
Successiveapproximations register
AVCC
Bus interface
Module data bus
Analog
multiplexer
øP/8
Comparator
Control circuit
Sample-andhold circuit
øP/16
AN 6
AN 7
ADI
interrupt
signal
ADTRG
Legend
ADCR:
ADCSR:
ADDRA:
ADDRB:
ADDRC:
ADDRD:
A/D control register
A/D control/status register
A/D data register A
A/D data register B
A/D data register C
A/D data register D
Figure 15.1 A/D Converter Block Diagram
376
15.1.3
Input Pins
Table 15.1 lists the A/D converter’s input pins. The eight analog input pins are divided into two
groups: group 0 (AN 0 to AN3), and group 1 (AN4 to AN7). AVCC and AVSS are the power supply
for the analog circuits in the A/D converter.
Table 15.1 A/D Converter Pins
Pin Name
Abbreviation
I/O
Function
Analog power supply pin
AVCC
Input
Analog power supply
Analog ground pin
AVSS
Input
Analog ground and reference voltage
Analog input pin 0
AN 0
Input
Group 0 analog inputs
Analog input pin 1
AN 1
Input
Analog input pin 2
AN 2
Input
Analog input pin 3
AN 3
Input
Analog input pin 4
AN 4
Input
Analog input pin 5
AN 5
Input
Analog input pin 6
AN 6
Input
Analog input pin 7
AN 7
Input
A/D external trigger input pin
ADTRG
Input
Group 1 analog inputs
External trigger input for starting A/D
conversion
377
15.1.4
Register Configuration
Table 15.2 summarizes the A/D converter’s registers.
Table 15.2 A/D Converter Registers
Name
Abbreviation
R/W
Initial Value
Address
A/D data register A (high)
ADDRAH
R
H'00
H'FFE0
A/D data register A (low)
ADDRAL
R
H'00
H'FFE1
A/D data register B (high)
ADDRBH
R
H'00
H'FFE2
A/D data register B (low)
ADDRBL
R
H'00
H'FFE3
A/D data register C (high)
ADDRCH
R
H'00
H'FFE4
A/D data register C (low)
ADDRCL
R
H'00
H'FFE5
A/D data register D (high)
ADDRDH
R
H'00
H'FFE6
A/D data register D (low)
ADDRDL
R
H'00
H'FFE7
A/D control/status register
ADCSR
R/(W)*
H'00
H'FFE8
A/D control register
ADCR
R/W
H'7F
H'FFE9
Note: * Only 0 can be written in bit 7, to clear the flag.
378
15.2
Register Descriptions
15.2.1
A/D Data Registers A to D (ADDRA to ADDRD)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
AD9 AD8 AD6 AD5 AD4 AD3 AD2 AD1 AD0 —
—
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Bits 15 to 6—A/D Conversion Data (AD9 to AD0): 10-bit data giving an A/D conversion result.
Bits 5 to 0—Reserved: These bits cannot be modified and are always read as 0.
The four A/D data registers (ADDRA to ADDRD) are 16-bit read-only registers that store the
results of A/D conversion.
An A/D conversion produces 10-bit data, which is transferred for storage into the A/D data
register corresponding to the selected channel. The upper 8 bits of the result are stored in the upper
byte of the A/D data register. The lower 2 bits are stored in the lower byte. Bits 5 to 0 of an A/D
data register are reserved bits that always read 0. Table 15.3 indicates the pairings of analog input
channels and A/D data registers.
The CPU can always read and write the A/D data registers. The upper byte can be read directly,
but the lower byte is read through a temporary register (TEMP). For details see section 15.3, CPU
Interface.
The A/D data registers are initialized to H'0000 by a reset and in standby mode.
Table 15.3 Analog Input Channels and A/D Data Registers
Analog Input Channel
Group 0
Group 1
A/D Data Register
AN 0
AN 4
ADDRA
AN 1
AN 5
ADDRB
AN 2
AN 6
ADDRC
AN 3
AN 7
ADDRD
379
15.2.2
A/D Control/Status Register (ADCSR)
Bit
7
6
5
4
3
2
1
0
ADF
ADIE
ADST
SCAN
CKS
CH2
CH1
CH0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W)*
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note: * Only 0 can be written, to clear the flag.
ADCSR is an 8-bit readable/writable register that selects the mode and controls the A/D converter.
ADCSR is initialized to H'00 by a reset and in standby mode.
Bit 7—A/D End Flag (ADF): Indicates the end of A/D conversion.
Bit 7
ADF
Description
0
[Clearing condition]
(Initial value)
Cleared by reading ADF while ADF = 1, then writing 0 in ADF
1
[Setting conditions]
1. Single mode: A/D conversion ends
2. Scan mode: A/D conversion ends in all selected channels
Bit 6—A/D Interrupt Enable (ADIE): Enables or disables the interrupt (ADI) requested at the
end of A/D conversion.
Bit 6
ADIE
Description
0
A/D end interrupt request (ADI) is disabled
1
A/D end interrupt request (ADI) is enabled
380
(Initial value)
Bit 5—A/D Start (ADST): Starts or stops A/D conversion. The ADST bit remains set to 1 during
A/D conversion. It can also be set to 1 by external trigger input at the ADTRG pin.
Bit 5
ADST
Description
0
A/D conversion is stopped
1
1. Single mode: A/D conversion starts; ADST is automatically cleared to 0 when
conversion ends
(Initial value)
2. Scan mode: A/D conversion starts and continues, cycling among the selected
channels, until ADST is cleared to 0 by software, by a reset, or by a transition to
standby mode
Bit 4—Scan Mode (SCAN): Selects single mode or scan mode. For further information on
operation in these modes, see section 15.4, Operation. Clear the ADST bit to 0 before switching
the conversion mode.
Bit 4
SCAN
Description
0
Single mode
1
Scan mode
(Initial value)
Bit 3—Clock Select (CKS): Selects the A/D conversion time. Clear the ADST bit to 0 before
switching the conversion time. If øP = ø/2, the conversion time is twice as long.
Bit 3
CKS
Description
0
Conversion time = 266 states (maximum) (when øP = ø)
1
Conversion time = 134 states (maximum) (when øP = ø)
(Initial value)
381
Bits 2 to 0—Channel Select 2 to 0 (CH2 to CH0): These bits and the SCAN bit select the analog
input channels. Clear the ADST bit to 0 before changing the channel selection.
Group Selection
Channel Selection
Description
CH2
CH1
CH0
Single Mode
Scan Mode
0
0
0
AN 0 (initial value)
AN 0
1
AN 1
AN 0, AN 1
0
AN 2
AN 0 to AN2
1
AN 3
AN 0 to AN3
0
AN 4
AN 4
1
AN 5
AN 4, AN 5
0
AN 6
AN 4 to AN6
1
AN 7
AN 4 to AN7
1
1
0
1
15.2.3
A/D Control Register (ADCR)
Bit
7
6
5
4
3
2
1
0
TRGE
—
—
—
—
—
—
—
Initial value
0
1
1
1
1
1
1
1
Read/Write
R/W
—
—
—
—
—
—
—
ADCR is an 8-bit readable/writable register that enables or disables external triggering of A/D
conversion. ADCR is initialized to H'7F by a reset and in standby mode.
Bit 7—Trigger Enable (TRGE): Enables or disables external triggering of A/D conversion.
Bit 7
TRGE
Description
0
A/D conversion cannot be externally triggered
1
Enables start of A/D conversion at the falling edge of the external trigger signal
(ADTRG) (A/D conversion can be started by an external trigger or by software.)
Bits 6 to 0—Reserved: These bits cannot be modified, and are always read as 1.
382
(Initial value)
15.3
CPU Interface
ADDRA to ADDRD are 16-bit registers, but they are connected to the CPU by an 8-bit data bus.
Therefore, although the upper byte can be be accessed directly by the CPU, the lower byte is read
through an 8-bit temporary register (TEMP).
An A/D data register is read as follows. When the upper byte is read, the upper-byte value is
transferred directly to the CPU and the lower-byte value is transferred into TEMP. Next, when the
lower byte is read, the TEMP contents are transferred to the CPU.
When reading an A/D data register, always read the upper byte before the lower byte. It is possible
to read only the upper byte, but if only the lower byte is read, incorrect data may be obtained.
Figure 15.2 shows the data flow for access to an A/D data register.
Upper-byte read
CPU
(H'AA)
Module data bus
Bus interface
TEMP
(H'40)
ADDRnH
(H'AA)
ADDRnL
(H'40)
(n = A to D)
Lower-byte read
CPU
(H'40)
Module data bus
Bus interface
TEMP
(H'40)
ADDRnH
(H'AA)
ADDRnL
(H'40)
(n = A to D)
Figure 15.2 A/D Data Register Access Operation (Reading H'AA40)
383
15.4
Operation
The A/D converter operates by successive approximations with 10-bit resolution. It has two
operating modes: single mode and scan mode.
15.4.1
Single Mode (SCAN = 0)
Single mode should be selected when only one A/D conversion on one channel is required. A/D
conversion starts when the ADST bit is set to 1 by software, or by external trigger input. The
ADST bit remains set to 1 during A/D conversion and is automatically cleared to 0 when
conversion ends.
When conversion ends the ADF bit is set to 1. If the ADIE bit is also set to 1, an ADI interrupt is
requested at this time. To clear the ADF flag to 0, first read ADCSR, then write 0 in ADF.
When the mode or analog input channel must be switched during analog conversion, to prevent
incorrect operation, first clear the ADST bit to 0 in ADCSR to halt A/D conversion. After making
the necessary changes, set the ADST bit to 1 to start A/D conversion again. The ADST bit can be
set at the same time as the mode or channel is changed.
Typical operations when channel 1 (AN1) is selected in single mode are described next. Figure
15.3 shows a timing diagram for this example.
1. Single mode is selected (SCAN = 0), input channel AN1 is selected (CH2 = CH1 = 0, CH0 =
1), the A/D interrupt is enabled (ADIE = 1), and A/D conversion is started (ADST = 1).
2. When A/D conversion is completed, the result is transferred into ADDRB. At the same time
the ADF flag is set to 1, the ADST bit is cleared to 0, and the A/D converter becomes idle.
3. Since ADF = 1 and ADIE = 1, an ADI interrupt is requested.
4. The A/D interrupt handling routine starts.
5. The routine reads ADCSR, then writes 0 in the ADF flag.
6. The routine reads and processes the conversion result (ADDRB).
7. Execution of the A/D interrupt handling routine ends. After that, if the ADST bit is set to 1,
A/D conversion starts again and steps 2 to 7 are repeated.
384
Figure 15.3 Example of A/D Converter Operation
(Single Mode, Channel 1 Selected)
385
Note: * Vertical arrows ( ) indicate instructions executed by software.
ADDRD
ADDRC
ADDRB
A/D conversion result (2)
A/D conversion result (1)
Idle
Clear *
Read conversion result
A/D conversion (2)
Set *
Read conversion result
Idle
State of channel 3
(AN 3)
ADDRA
Idle
State of channel 2
(AN 2)
Idle
Clear *
State of channel 1
(AN 1)
A/D conversion (1)
Set *
Idle
Idle
A/D conversion
starts
State of channel 0
(AN 0)
ADF
ADST
ADIE
Set *
15.4.2
Scan Mode (SCAN = 1)
Scan mode is useful for monitoring analog inputs in a group of one or more channels. When the
ADST bit is set to 1 by software or external trigger input, A/D conversion starts on the first
channel in the group (AN0 when CH2 = 0, AN4 when CH2 = 1). When two or more channels are
selected, after conversion of the first channel ends, conversion of the second channel (AN1 or
AN5) starts immediately. A/D conversion continues cyclically on the selected channels until the
ADST bit is cleared to 0. The conversion results are transferred for storage into the A/D data
registers corresponding to the channels.
When the mode or analog input channel selection must be changed during analog conversion, to
prevent incorrect operation, first clear the ADST bit to 0 in ADCSR to halt A/D conversion. After
making the necessary changes, set the ADST bit to 1. A/D conversion will start again from the
first channel in the group. The ADST bit can be set at the same time as the mode or channel
selection is changed.
Typical operations when three channels in group 0 (AN0 to AN2) are selected in scan mode are
described next. Figure 15.4 shows a timing diagram for this example.
1. Scan mode is selected (SCAN = 1), scan group 0 is selected (CH2 = 0), analog input channels
AN0 to AN2 are selected (CH1 = 1, CH0 = 0), and A/D conversion is started (ADST = 1).
2. When A/D conversion of the first channel (AN0) is completed, the result is transferred into
ADDRA. Next, conversion of the second channel (AN 1) starts automatically.
3. Conversion proceeds in the same way through the third channel (AN2).
4. When conversion of all selected channels (AN0 to AN2) is completed, the ADF flag is set to 1
and conversion of the first channel (AN0) starts again. If the ADIE bit is set to 1, an ADI
interrupt is requested at this time.
5. Steps 2 to 4 are repeated as long as the ADST bit remains set to 1. When the ADST bit is
cleared to 0, A/D conversion stops. After that, if the ADST bit is set to 1, A/D conversion
starts again from the first channel (AN0).
386
Figure 15.4 Example of A/D Converter Operation
(Scan Mode, Channels AN0 to AN2 Selected)
387
Idle
Idle
Idle
A/D conversion (1)
Transfer
A/D conversion result (1)
Idle
Idle
Clear*1
Idle
A/D conversion result (3)
A/D conversion result (2)
A/D conversion result (4)
Idle
A/D conversion (5) *2
A/D conversion time
A/D conversion (4)
Idle
A/D conversion (3)
Idle
A/D conversion (2)
Notes: 1. Vertical arrows ( ) indicate instructions executed by software.
2. Data currently being converted is ignored.
ADDRD
ADDRC
ADDRB
ADDRA
State of channel 3
(AN 3)
State of channel 2
(AN 2)
State of channel 1
(AN 1)
State of channel 0
(AN 0)
ADF
ADST
Set *1
Continuous A/D conversion
Clear*1
15.4.3
Input Sampling and A/D Conversion Time
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input at a time tD after the ADST bit is set to 1, then starts conversion. Figure 15.5 shows the A/D
conversion timing. Table 15.4 indicates the A/D conversion time.
As indicated in figure 15.5, the A/D conversion time includes t D and the input sampling time. The
length of tD varies depending on the timing of the write access to ADCSR. The total conversion
time therefore varies within the ranges indicated in table 15.4.
In scan mode, the values given in table 15.4 apply to the first conversion. In the second and
subsequent conversions the conversion time is fixed at 256 states when CKS = 0 or 128 states
when CKS = 1 (when øP = ø).
(1)
ø
Address bus
(2)
Write signal
Input sampling
timing
ADF
tD
t SPL
t CONV
Legend
(1):
ADCSR write cycle
(2):
ADCSR address
tD:
Synchronization delay
tSPL: Input sampling time
tCONV: A/D conversion time
Figure 15.5 A/D Conversion Timing
388
Table 15.4 A/D Conversion Time (Single Mode)
CKS = 0
CKS = 1
Symbol
Min
Typ
Max
Min
Typ
Max
Synchronization delay
tD
10
—
17
6
—
9
Input sampling time*
t SPL
—
80
—
—
40
—
A/D conversion time*
t CONV
259
—
266
131
—
134
Notes: Values in the table are numbers of states.
* Values when øP = ø. If øP = ø/2, the values are twice those shown.
15.4.4
External Trigger Input Timing
A/D conversion can be externally triggered. When the TRGE bit is set to 1 in ADCR, external
trigger input is enabled at the ADTRG pin. A high-to-low transition at the ADTRG pin sets the
ADST bit to 1 in ADCSR, starting A/D conversion. Other operations, in both single and scan
modes, are the same as if the ADST bit had been set to 1 by software. Figure 15.6 shows the
timing.
ø
ADTRG
Internal trigger
signal
ADST
A/D conversion
Figure 15.6 External Trigger Input Timing
389
15.5
Interrupts
The A/D converter generates an interrupt (ADI) at the end of A/D conversion. The ADI interrupt
request can be enabled or disabled by the ADIE bit in ADCSR.
15.6
Usage Notes
The following points should be noted when using the A/D converter.
Setting Range of Analog Power Supply and Other Pins:
1. Analog input voltage range
The voltage applied to the ANn analog input pins during A/D conversion should be in the range
AVSS ≤ ANn ≤ AVCC (n = 0 to 7).
2. AVCC and AVSS input voltages
AVCC should have the following value: AVSS = VSS . If the A/D converter is not used, the values
should be AV CC = VCC and AVSS = VSS .
Notes on Board Design: In board design, digital circuitry and analog circuitry should be as
mutually isolated as possible, and layout in which digital circuit signal lines and analog circuit
signal lines cross or are in close proximity should be avoided as far as possible. Failure to do so
may result in incorrect operation of the analog circuitry due to inductance, adversely affecting A/D
conversion values.
Also, digital circuitry must be isolated from the analog input signals (AN0 to AN7), analog
reference power supply (AVref), and analog power supply (AVCC) by the analog ground (AVSS ).
Also, the analog ground (AVSS) should be connected at one point to a stable digital ground (VSS)
on the board.
Notes on Noise Countermeasures: A protection circuit connected to prevent damage due to an
abnormal voltage such as an excessive surge at the analog input pins (AN0 to AN7) should be
connected between AVCC and AVSS as shown in figure 15.7.
Also, the bypass capacitors connected to AVCC, the filter capacitor connected to AN 0 to AN7 must
be connected to AV SS .
If a filter capacitor is connected as shown in figure 15.7, the input currents at the analog input pins
(AN0 to AN7) are averaged, and so an error may arise. Also, when A/D conversion is performed
frequently, as in scan mode, if the current charged and discharged by the capacitance of the
sample-and-hold circuit in the A/D converter exceeds the current input via the input impedance
(Rin), an error will arise in the analog input pin voltage. Careful consideration is therefore
required when deciding the circuit constants.
390
AVCC
100 Ω
Rin* 2
AN0 to AN7
*1
0.1 µF
Notes:
AVSS
Figures are reference values.
1.
10 µF
0.01 µF
2. Rin: Input impedance
Figure 15.7 Example of Analog Input Protection Circuit
A/D Conversion Precision Definitions: H8/3318 A/D conversion precision definitions are given
below.
• Resolution
The number of A/D converter digital output codes
• Offset error
The deviation of the analog input voltage value from the ideal A/D conversion characteristic
when the digital output changes from the minimum voltage value B'0000000000 (H'000) to
B'0000000001 (H'001) (see figure 15.9).
• Full-scale error
The deviation of the analog input voltage value from the ideal A/D conversion characteristic
when the digital output changes from B'1111111110 (H'3FE) to B'111111111 (H'3FF) (see
figure 15.10).
• Quantization error
The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 15.8).
391
• Nonlinearity error
The error with respect to the ideal A/D conversion characteristic between the zero voltage and
the full-scale voltage. Does not include the offset error, full-scale error, or quantization error.
• Absolute precision
The deviation between the digital value and the analog input value. Includes the offset error,
full-scale error, quantization error, and nonlinearity error.
Digital output
H'3FF
Ideal A/D conversion
characteristic
H'3FE
H'3FD
H'004
H'003
H'002
Quantization error
H'001
H'000
1
2
1024 1024
1022 1023 FS
1024 1024
Analog
input voltage
Figure 15.8 A/D Conversion Precision Definitions (1)
392
Full-scale error
Digital output
Ideal A/D conversion
characteristic
Nonlinearity
error
Actual A/D conversion
characteristic
FS
Offset error
Analog
input voltage
Figure 15.9 A/D Conversion Precision Definitions (2)
Permissible Signal Source Impedance: H8/3318 analog input is designed so that conversion
precision is guaranteed for an input signal for which the signal source impedance is 10 kΩ or less.
This specification is provided to enable the A/D converter’s sample-and-hold circuit input
capacitance to be charged within the sampling time; if the sensor output impedance exceeds 10
kΩ, charging may be insufficient and it may not be possible to guarantee the A/D conversion
precision.
However, if a large capacitance is provided externally, the input load will essentially comprise
only the internal input resistance of 10 kΩ, and the signal source impedance is ignored.
But since a low-pass filter effect is obtained in this case, it may not be possible to follow an analog
signal with a large differential coefficient (e.g., 5 mV/µsec or greater).
When converting a high-speed analog signal, a low-impedance buffer should be inserted.
393
Influences on Absolute Precision: Adding capacitance results in coupling with GND, and
therefore noise in GND may adversely affect absolute precision. Be sure to make the connection to
an electrically stable GND such as AVSS.
Care is also required to insure that filter circuits do not communicate with digital signals on the
mounting board, so acting as antennas.
H8/3318
chip
Sensor output
impedance,
up to 10 kΩ
A/D converter
equivalent circuit
10 kΩ
Sensor input
Low-pass
filter
C to 0.1 µF
Cin =
15 pF
Figure 15.10 Example of Analog Input Circuit
394
20 pF
Section 16 RAM
16.1
Overview
The H8/3318 includes 4 kbytes, of on-chip static RAM. The RAM is connected to the CPU via 16bit data bus. Both byte and word access to the on-chip RAM are performed in two states, enabling
rapid data transfer and instruction execution.
The on-chip RAM is assigned to addresses H'EF80 to H'FF7F in the H8/3318. The RAME bit in
the system control register (SYSCR) can enable or disable the on-chip RAM.
16.1.1
Block Diagram
Figure 16.1 is a block diagram of the on-chip RAM.
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'EF80
H'EF81
H'EF82
H'EF83
On-chip RAM
H'FF7E
Even address
H'FF7F
Odd address
Figure 16.1 Block Diagram of On-Chip RAM
395
16.1.2
RAM Enable Bit (RAME) in System Control Register (SYSCR)
The on-chip RAM is enabled or disabled by the RAME (RAM Enable) bit in the system control
register (SYSCR).
Bit
7
6
5
4
3
2
1
0
SSBY
STS2
STS1
STS0
XRST
NMIEG
HIE
RAME
Initial value
0
0
0
0
1
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
The only bit in the system control register that concerns the on-chip RAM is the RAME bit. See
section 3.2, System Control Register, for the other bits.
Bit 0—RAM Enable (RAME): This bit enables or disables the on-chip RAM.
The RAME bit is initialized to 1 on the rising edge of the RES signal, so a reset enables the onchip RAM. The RAME bit is not initialized in software standby mode.
Bit 0
RAME
Description
0
On-chip RAM is disabled
1
On-chip RAM is enabled
16.2
Operation
16.2.1
Expanded Modes (Modes 1 and 2)
(Initial value)
If the RAME bit is set to 1, accesses to addresses H'EF80 to H'FF7F in the H8/3318, are directed
to the on-chip RAM. If the RAME bit is cleared to 0, accesses to these addresses are directed to
the external data bus.
16.2.2
Single-Chip Mode (Mode 3)
If the RAME bit is set to 1, accesses to addresses H'EF80 to H'FF7F in the H8/3318, are directed
to the on-chip RAM.
If the RAME bit is cleared to 0, the on-chip RAM data cannot be accessed. Attempted write access
has no effect. Attempted read access always results in H'FF data being read.
396
16.3
Application Notes
16.3.1
Note on Initial Values
The initial value of RAM is undetermined after a power-on reset. Areas to be used must be
initialized.
397
Section 17 ROM
17.1
Overview
The H8/3318 includes 60 kbytes, of high-speed, on-chip ROM. The on-chip ROM is connected to
the CPU via a 16-bit data bus. Both byte data and word data are accessed in two states, enabling
rapid data transfer and instruction fetching.
The on-chip ROM is enabled or disabled depending on the MCU operating mode, which is
determined by the inputs at the mode pins (MD1 and MD0). See table 17.1.
Table 17.1 On-Chip ROM Usage in Each MCU Mode
Mode Pins
Mode
MD1
MD0
On-Chip ROM
Mode 1 (expanded mode)
0
1
Disabled (external addresses)
Mode 2 (expanded mode)
1
0
Enabled
Mode 3 (single-chip mode)
1
1
Enabled
In PROM mode the PROM version (H8/3318 ZTAT) can be programmed with a standard PROM
programmer.
In the H8/3318, the accessible ROM addresses are H'0000 to H'E77F (59,264 bytes) in mode 2,
and H'0000 to H'EF7F (61,312 bytes) in mode 3. For details, see section 3, MCU Operating
Modes and Address Space.
399
17.1.1
Block Diagram
Figure 17.1 is a block diagram of the on-chip ROM.
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'0000
H'0001
H'0002
H'0003
On-chip ROM
H'EF7E
H'EF7F
Even address
Odd address
Figure 17.1 Block Diagram of On-Chip ROM (H8/3318 Single-Chip Mode)
400
17.2
PROM Mode (H8/3318)
17.2.1
PROM Mode Setup
In PROM mode, the H8/3318 PROM version suspends its microcomputer functions to allow the
on-chip PROM to be programmed. The programming method is the same as for the HN27C101.
To select PROM mode, apply the signal inputs listed in table 17.2.
Table 17.2 Selection of PROM Mode
Pin
Input
Mode pin MD1
Low
Mode pin MD 0
Low
STBY pin
Low
Pins P63 and P64
High
17.2.2
Socket Adapter Pin Assignments and Memory Map
The H8/3318 PROM version can be programmed with a general-purpose PROM programmer by
using a socket adapter to change the pin-out to 32 pins. There are different socket adapters for
different packages as listed in table 17.3. Figure 17.2 shows the socket adapter pin assignments.
Table 17.3 Socket Adapters
Package
Socket Adapter
84-pin PLCC
HS338ESC02H
HS3337ESCS1H
80-pin QFP
HS338ESH02H
HS3337ESHS1H
80-pin TQFP
—
HS3337ESNS1H
84-pin windowed LCC
HS338ESG02H
HS3337ESGS1H
The PROM size is 60 kbytes in the H8/3318. Figure 17.3 shows the memory map of the H8/3318
in PROM mode. H'FF data should be specified for unused address areas in the on-chip PROM.
When programming with a PROM programmer, limit the program address range to H'0000 to
H'EF7F. Specify H'FF data for addresses H'EF80 and above. If these addresses are programmed
by mistake, it may become impossible to program or verify the PROM data. The same is true if
page programming is attempted. Particular care is required with a plastic package, since the
programmed data cannot be erased.
401
H8/3318
FP-80A CP-84
TFP-80C CG-84
EPROM Socket
Pin
Pin
HN27C101
(32 pins)
1
12
RES
V PP
1
6
17
NMI
EA 9
26
65
79
P3 0
EO 0
13
66
80
P3 1
EO 1
14
67
81
P3 2
EO 2
15
68
82
P3 3
EO 3
17
69
83
P3 4
EO 4
18
70
84
P3 5
EO 5
19
71
1
P3 6
EO 6
20
72
3
P3 7
EO 7
21
64
78
P1 0
EA 0
12
63
77
P1 1
EA 1
11
62
76
P1 2
EA 2
10
61
75
P1 3
EA 3
9
60
74
P1 4
EA 4
8
59
73
P1 5
EA 5
7
58
72
P1 6
EA 6
6
57
71
P1 7
EA 7
5
55
69
P2 0
EA 8
27
54
68
P2 1
OE
24
53
67
P2 2
EA 10
23
52
66
P2 3
EA 11
25
51
65
P2 4
EA 12
4
50
63
P2 5
EA 13
28
49
62
P2 6
EA 14
29
48
61
P2 7
CE
22
20
32
P9 0
EA 16
2
19
31
P9 1
EA 15
3
18
30
P9 2
PGM
31
24
36
P6 3
VCC
32
25
37
P6 4
29
42
AV CC
8, 47
19, 60
VCC
5
16
MD0
VSS
16
4
15
MD1
7
18
STBY
38
51
AV SS
12, 56,
2, 4, 23, VSS
73
24, 41,
64, 70
Legend
VPP:
EO7 to EO0:
EA16 to EA0:
OE:
CE:
PGM:
Programming power supply (12.5 V)
Data input/output
Address input
Output enable
Chip enable
Program enable
Note: All pins not listed in this figure should be left open.
Figure 17.2 Socket Adapter Pin Assignments
402
Address in MCU mode
Address in PROM mode
H'0000
H'0000
On-chip
PROM
H'EF7F
H'EF7F
1 output*
H'1FFFF
Note: * If this address area is read in PROM mode, the output data is H'FF.
Figure 17.3 H8/3318 Memory Map in PROM Mode
17.3
Programming
The write, verify, and other sub-modes of the PROM mode are selected as shown in table 17.4.
Table 17.4 Selection of Sub-Modes in PROM Mode
Sub-Mode
CE
OE
PGM
VPP
VCC
EO7 to EO0
EA 16 to EA0
Write
Low
High
Low
VPP
VCC
Data input
Address input
Verify
Low
Low
High
VPP
VCC
Data output
Address input
Programming
inhibited
Low
Low
High
High
Low
High
Low
High
Low
High
Low
High
VPP
VCC
High impedance
Address input
The H8/3318 PROM has the same standard read/write specifications as the HN27C101 EPROM.
Page programming is not supported, however, so do not select page programming mode. PROM
programmers that provide only page programming cannot be used. When selecting a PROM
programmer, check that it supports a byte-at-a-time high-speed programming mode. Be sure to set
the address range to H'0000 to H'EF7F.
403
17.3.1
Programming and Verification
An efficient, high-speed programming procedure can be used to program and verify PROM data.
This procedure programs data quickly without subjecting the chip to voltage stress and without
sacrificing data reliability. It leaves the data H'FF in unused addresses.
Figure 17.4 shows the basic high-speed programming flowchart.
Tables 17.5 and 17.6 list the electrical characteristics of the chip in PROM mode. Figure 17.5
shows a program/verify timing chart.
Start
Set program/verify mode
VCC = 6.0 V ±0.25 V,
VPP = 12.5 V ±0.3 V
Address = 0
n=0
n + 1→ n
Program tPW = 0.2 ms ±5%
No
Yes
n < 25?
No
Address + 1 → address
Verify OK?
Yes
Program tOPW = 0.2n ms
Last address?
No
Yes
Set read mode
VCC = 5.0 V ±0.25 V,
VPP = VCC
Error
No go
Read all
addresses
Go
End
Figure 17.4 High-Speed Programming Flowchart
404
Table 17.5 DC Characteristics
(when VCC = 6.0 V ±0.25 V, VPP = 12.5 V ±0.3 V, VSS = 0 V, Ta = 25°C ±5°C)
Item
Symbol
Min
Typ
Max
Unit
Test Conditions
Input high
voltage
EO7 – EO0,
EA16 – EA0,
OE, CE, PGM
VIH
2.4
—
VCC + 0.3
V
Input low
voltage
EO7 – EO0,
EA16 – EA0,
OE, CE, PGM
VIL
– 0.3
—
0.8
V
Output high
voltage
EO7 – EO0
VOH
2.4
—
—
V
I OH = –200 µA
Output low
voltage
EO7 – EO0
VOL
—
—
0.45
V
I OL = 1.6 mA
Input leakage EO7 – EO0,
current
EA16 – EA0,
OE, CE, PGM
|ILI|
—
—
2
µA
Vin = 5.25 V/0.5 V
VCC current
I CC
—
—
40
mA
VPP current
I PP
—
—
40
mA
405
Table 17.6 AC Characteristics
(when VCC = 6.0 V ±0.25 V, VPP = 12.5 V ±0.3 V, Ta = 25°C ±5°C)
Item
Symbol
Min
Typ
Max
Unit
Test Conditions
Address setup time
t AS
2
—
—
µs
See figure 17.5*
OE setup time
t OES
2
—
—
µs
Data setup time
t DS
2
—
—
µs
Address hold time
t AH
0
—
—
µs
Data hold time
t DH
2
—
—
µs
Data output disable time
t DF
—
—
130
ns
VPP setup time
t VPS
2
—
—
µs
Program pulse width
t PW
0.19
0.20
0.21
ms
OE pulse width for
overwrite-programming
t OPW
0.19
—
5.25
ms
VCC setup time
t VCS
2
—
—
µs
CE setup time
t CES
2
—
—
µs
Data output delay time
t OE
0
—
150
ns
Note: * Input pulse level: 0.8 V to 2.2 V
Input rise/fall time ≤ 20 ns
Timing reference levels: input—1.0 V, 2.0 V; output—0.8 V, 2.0 V
406
Write
Verify
Address
tAH
tAS
Data
Input data
tDS
VPP
VCC
Output data
tDH
tDF
VPP
VCC
tVPS
VCC + 1
VCC
tVCS
CE
tCES
PGM
tPW
OE
tOES
tOE
tOPW
Figure 17.5 PROM Program/Verify Timing
407
17.3.2
Notes on Programming
(1) Program with the specified voltages and timing. The programming voltage (VPP) is
12.5 V.
Caution: Applied voltages in excess of the specified values can permanently destroy the chip. Be
particularly careful about the PROM programmer’s overshoot characteristics.
If the PROM programmer is set to HN27C101 specifications, VPP will be 12.5 V.
(2) Before writing data, check that the socket adapter and chip are correctly mounted in the
PROM writer. Overcurrent damage to the chip can result if the index marks on the PROM
programmer, socket adapter, and chip are not correctly aligned.
(3) Don’t touch the socket adapter or chip while writing. Touching either of these can cause
contact faults and write errors.
(4) Page programming is not supported. Do not select page programming mode.
(5) The PROM size is 60 kbytes. Set the address range to H'0000 to H'EF7F. When
programming, specify H'FF data for unused address areas (H'EF80 to H'1FFFF).
17.3.3
Reliability of Programmed Data
An effective way to assure the data holding characteristics of the programmed chips is to bake
them at 150°C, then screen them for data errors. This procedure quickly eliminates chips with
PROM memory cells prone to early failure.
Figure 17.6 shows the recommended screening procedure.
408
Write and verify program
Bake with power off
125° to 150°C, 24 to 48 Hr
Read and check program
VCC = 5 V
Install
Note: The baking time is the time from when the bake-oven reaches the specified temperature.
Figure 17.6 Recommended Screening Procedure
If a series of write errors occurs while the same PROM programmer is in use, stop programming
and check the PROM programmer and socket adapter for defects.
Please inform Hitachi of any abnormal conditions noted during programming or in screening of
program data after high-temperature baking.
17.3.4
Erasing Data
Data is erased by exposing the transparent window in the package to ultraviolet light. The erase
conditions are shown in table 17.7.
Table 17.7 Erase Conditions
Item
Value
Ultraviolet wavelength
253.7nm
Minimum irradiation
15W ⋅ s/cm2
The erase conditions in table 17.7 can be met by exposure to a 12000 µW/cm2 ultraviolet lamp
positioned 2 to 3 cm directly above the chip for approximately 20 minutes.
409
17.4
Handling of Windowed Packages
17.4.1
Glass Erasing Window
Rubbing the glass erasing window of a windowed package with a plastic material or touching it
with an electrically charged object can create a static charge on the window surface which may
cause the chip to malfunction.
If the erasing window becomes charged, the charge can be neutralized by a short exposure to
ultraviolet light. This returns the chip to its normal condition, but it also reduces the charge stored
in the floating gates of the PROM, so it is recommended that the chip be reprogrammed afterward.
Accumulation of static charge on the window surface can be prevented by the following
precautions:
1. When handling the package, ground yourself. Don’t wear gloves. Avoid other possible sources
of static charge.
2. Avoid friction between the glass window and plastic or other materials that tend to accumulate
static charge.
3. Be careful when using cooling sprays, since they may have slight ion content.
4. Cover the window with an ultraviolet-shield label, preferably a label including a conductive
material. Besides protecting the PROM contents from ultraviolet light, the label protects the
chip by distributing static charge uniformly.
17.4.2
Handling after Programming
Fluorescent light and sunlight contain small amounts of ultraviolet, so prolonged exposure to these
types of light can cause programmed data to invert. In addition, exposure to any type of intense
light can induce photoelectric effects that may lead to chip malfunction. It is recommended that
after programming the chip, you cover the erasing window with a light-proof label (such as an
ultraviolet-shield label).
17.4.3
84-Pin LCC Package
A socket should always be used when the 84-pin LCC package is mounted on a printed-circuit
board. Table 17.8 shows the recommended socket.
Table 17.8 Recommended Socket for Mounting 84-Pin LCC Package
Manufacturer
Code
Sumitomo 3-M
284-1273-00-1102J
410
Section 18 Power-Down State
18.1
Overview
The H8/3318 has a power-down state that greatly reduces power consumption by stopping some or
all of the chip functions. The power-down state includes three modes:
1. Sleep mode—a software-triggered mode in which the CPU halts but the rest of the chip
remains active
2. Software standby mode—a software-triggered mode in which the entire chip is inactive
3. Hardware standby mode—a hardware-triggered mode in which the entire chip is inactive
Table 18.1 lists the conditions for entering and leaving the power-down modes. It also indicates
the status of the CPU, on-chip supporting modules, etc. in each power-down mode.
Table 18.1 Power-Down State
Mode
Sleep
mode
Software
standby
mode
Entering
Procedure Clock CPU
Execute
Run
SLEEP
instruction
Halt
Set SSBY Halt
bit in
SYSCR to
1, then
execute
SLEEP
instruction
Halt
Hardware Set STBY
standby
pin to low
mode
level
Halt
DTU
CPU
Sup.
Reg’s. Mod.
RAM
I/O Ports
Exiting
Methods
Run
Held
Held
Held
• Interrupt
Run
• RES
• STBY
Halt
Held
Halt and Held
initialized
Held
• NMI
• IRQ0–IRQ2,
IRQ6
• RES
• STBY
Halt
Halt
Not
held
Halt and Held
initialized
High
• STBY and
impedance RES
state
Legend
SYSCR: System control register
SSBY: Software standby bit
411
18.1.1
System Control Register (SYSCR)
Four of the eight bits in the system control register (SYSCR) control the power-down state. These
are bit 7 (SSBY) and bits 6 to 4 (STS2 to STS0). See table 18.2.
Table 18.2 System Control Register
Name
Abbreviation
R/W
Initial Value
Address
System control register
SYSCR
R/W
H'09
H'FFC4
Bit
7
6
5
4
3
2
1
0
SSBY
STS2
STS1
STS0
XRST
NMIEG
DPME
RAME
Initial value
0
0
0
0
1
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
Bit 7—Software Standby (SSBY): This bit enables or disables the transition to software standby
mode.
On recovery from software standby mode by an external interrupt, SSBY remains set to 1. To
clear this bit, software must write a 0.
Bit 7
SSBY
Description
0
The SLEEP instruction causes a transition to sleep mode
1
The SLEEP instruction causes a transition to software standby mode
(Initial value)
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the clock settling
time when the chip recovers from software standby mode by an external interrupt. During the
selected time, the clock oscillator runs but the CPU and on-chip supporting modules remain in
standby. Set bits STS2 to STS0 according to the clock frequency to obtain a settling time of at
least 8 ms. See table 18.3.
Bit 6
STS2
Bit 5
STS1
Bit 4
STS0
Description
0
0
0
Settling time = 8,192 states
1
Settling time = 16,384 states
0
Settling time = 32,768 states
1
Settling time = 65,536 states
0
—
Settling time = 131,072 states
1
—
Prohibited
1
1
412
(Initial value)
18.2
Sleep Mode
18.2.1
Transition to Sleep Mode
When the SSBY bit in the system control register is cleared to 0, execution of the SLEEP
instruction causes a transition from the program execution state to sleep mode. After executing the
SLEEP instruction, the CPU halts, but the contents of its internal registers remain unchanged. The
on-chip supporting modules continue to operate normally.
18.2.2
Exit from Sleep Mode
The chip exits sleep mode when it receives an internal or external interrupt request, or a low input
at the RES or STBY pin.
Exit by Interrupt: An interrupt releases sleep mode and starts the CPU’s interrupt-handling
sequence.
If an interrupt from an on-chip supporting module is disabled by the corresponding enable/disable
bit in the module’s control register, the interrupt cannot be requested, so it cannot wake the chip
up. Similarly, the CPU cannot be awakened by an interrupt other than NMI if the I (interrupt
mask) bit is set when the SLEEP instruction is executed.
Exit by RES pin: When the RES pin goes low, the chip exits from sleep mode to the reset state.
Exit by STBY pin: When the STBY pin goes low, the chip exits from sleep mode to hardware
standby mode.
18.3
Software Standby Mode
18.3.1
Transition to Software Standby Mode
To enter software standby mode, set the standby bit (SSBY) in the system control register
(SYSCR) to 1, then execute the SLEEP instruction.
In software standby mode, the system clock stops and chip functions halt, including both CPU
functions and the functions of the on-chip supporting modules. Power consumption is reduced to
an extremely low level. The on-chip supporting modules and their registers are reset to their initial
states, but as long as a minimum necessary voltage supply is maintained, the contents of the CPU
registers and on-chip RAM remain unchanged.
413
18.3.2
Exit from Software Standby Mode
The chip can be brought out of software standby mode by an input at one of six pins: NMI, IRQ0,
IRQ1, IRQ2, IRQ6, RES, or STBY.
Exit by Interrupt: When an NMI, IRQ0, IRQ1, IRQ2, or IRQ6 interrupt request signal is input, the
clock oscillator begins operating. After the waiting time set in bits STS2 to STS0 of SYSCR, a
stable clock is supplied to the entire chip, software standby mode is released, and interrupt
exception-handling begins. IRQ3 to IRQ5, IRQ7 interrupts should be disabled before the transition
to software standby (clear IRQ3E to IRQ5E, IRQ7E to 0).
Exit by RES Pin: When the RES input goes low, the clock oscillator begins operating. When
RES is brought to the high level (after allowing time for the clock oscillator to settle), the CPU
starts reset exception handling. Be sure to hold RES low long enough for clock oscillation to
stabilize.
Exit by STBY Pin: When the STBY input goes low, the chip exits from software standby mode
to hardware standby mode.
18.3.3
Clock Settling Time for Exit from Software Standby Mode
Set bits STS2 to STS0 in SYSCR as follows:
• Crystal oscillator
Set STS2 to STS0 for a settling time of at least 8 ms. Table 18.3 lists the settling times selected
by these bits at several clock frequencies.
• External clock
The STS bits can be set to any value. Normally, the minimum value (STS2 = STS1 = STS0 =
0) is recommended.
Table 18.3 Times Set by Standby Timer Select Bits (Unit: ms)
STS2
STS1
STS0
Settling
Time
(States)
0
0
0
8,192
0.51
0.65
0.8
1.0
1.3
2.0
4.1
8.2
16.4
0
0
1
16,384
1.0
1.3
1.6
2.0
2.7
4.1
8.2
16.4
32.8
0
1
0
32,768
2.0
2.7
3.3
4.1
5.5
8.2
16.4
32.8
65.5
0
1
1
65,536
4.1
5.5
6.6
8.2
10.9
16.4
32.8
65.5
131.1
1
0
—
131,072
8.2
10.9
13.1
16.4
21.8
32.8
65.5
131.1 262.1
System Clock Frequency (MHz)
16
12
10
8
6
4
2
1
0.5
Note: Recommended values are printed in boldface.
414
18.3.4
Sample Application of Software Standby Mode
In this example the chip enters the software standby mode when NMI goes low and exits when
NMI goes high, as shown in figure 18.1.
The NMI edge bit (NMIEG) in the system control register is originally cleared to 0, selecting the
falling edge. When NMI goes low, the NMI interrupt handling routine sets NMIEG to 1 (selecting
the rising edge), sets SSBY to 1, then executes the SLEEP instruction. The chip enters software
standby mode. It recovers from software standby mode on the next rising edge of NMI.
Clock
oscillator
ø
NMI
NMIEG
SSBY
NMI interrupt
handler
NMIEG = 1
SSBY = 1
Software standby
mode (powerdown state)
Settling time
NMI interrupt
handler
SLEEP
Figure 18.1 NMI Timing in Software Standby Mode
18.3.5
Application Note
The I/O ports retain their current states in software standby mode. If a port is in the high output
state, the current dissipation caused by the high output current is not reduced.
415
18.4
Hardware Standby Mode
18.4.1
Transition to Hardware Standby Mode
Regardless of its current state, the chip enters hardware standby mode whenever the STBY pin
goes low.
Hardware standby mode reduces power consumption drastically by halting the CPU, stopping all
the functions of the on-chip supporting modules, and placing I/O ports in the high-impedance
state. The registers of the on-chip supporting modules are reset to their initial values. Only the onchip RAM is held unchanged, provided the minimum necessary voltage supply is maintained.
Notes: 1. The RAME bit in the system control register should be cleared to 0 before the STBY
pin goes low.
2. Do not change the inputs at the mode pins (MD1, MD0) during hardware standby mode.
Be particularly careful not to let both mode pins go low in hardware standby mode,
since that places the chip in PROM mode and increases current dissipation.
18.4.2
Recovery from Hardware Standby Mode
Recovery from hardware standby mode requires inputs at both the STBY and RES pins. When the
STBY pin goes high, the clock oscillator begins running. The RES pin should be low at this time
and should be held low long enough for the clock to stabilize. When the RES pin changes from
low to high, the reset sequence is executed and the chip returns to the program execution state.
416
18.4.3
Timing Relationships
Figure 18.2 shows the timing relationships in hardware standby mode.
In the sequence shown, first RES goes low, then STBY goes low, at which point the chip enters
hardware standby mode. To recover, first STBY goes high, then after the clock settling time, RES
goes high.
Clock pulse
generator
RES
STBY
Clock settling
time
Restart
Figure 18.2 Hardware Standby Mode Timing
417
Section 19 Electrical Specifications
19.1
Absolute Maximum Ratings
Table 19.1 lists the absolute maximum ratings.
Table 19.1 Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Supply voltage
VCC
–0.3 to +7.0
V
Programming voltage
VPP
–0.3 to +13.5
V
Input voltage
Ports 1–6, 8, 9
Vin
–0.3 to VCC + 0.3
V
Port 7
Vin
–0.3 to AVCC + 0.3
V
Analog supply voltage
AVCC
–0.3 to +7.0
V
Analog input voltage
VAN
–0.3 to AVCC + 0.3
V
Operating temperature
Topr
Regular specifications: –20 to +75
°C
Wide-range specifications: –40 to +85
°C
–55 to +125
°C
Storage temperature
Tstg
Note: Exceeding the absolute maximum ratings shown in table 19.1 can permanently destroy
the chip.
19.2
Electrical Characteristics
19.2.1
DC Characteristics
Tables 19.2, 19.3, and 19.4 list the DC characteristics of the 5 V, 4 V, and 3 V versions,
respectively, and tables 19.5 and 19.6 give the allowable current output values of the 5 V and 4 V,
and 3 V versions, respectively.
419
Table 19.2 DC Characteristics (5 V Version)
Conditions: VCC = 5.0 V ±10%, AVCC = 5.0 V ±10%*1, VSS = AVSS = 0 V, Ta = –20 to 75°C
(regular specifications), Ta = –40 to 85°C (wide-range specifications)
Item
Schmitt
trigger input
voltage
(1)
Input high
voltage
(2)
Symbol Min
Typ
Max
Unit
P86–P80* 2,
VT–
1.0
P97, P95–P90* 2,
FTCI, FTIA,
FTIB, FTIC,
—
VT +
FTID, FTI,
TMCI0, TMCI1,
TMRI0, TMRI1,
VT+ –V T– 0.4
IRQ6, IRQ7,
ETMCI0, ETMCI1,
ETMRI0, ETMRI1
—
—
V
—
VCC × 0.7
V
—
—
V
RES, STBY,
NMI, MD1, MD0,
EXTAL
VCC – 0.7
—
VCC + 0.3
V
2.0
—
AVCC + 0.3 V
VIH
P77 – P7 0
Test
Conditions
Input high
voltage
Input pins
other than
(1) and (2)
VIH
2.0
—
VCC + 0.3
V
Input low
voltage
(3)
RES, STBY,
MD1, MD0
VIL
–0.3
—
0.5
V
Input low
voltage
Input pins
other than
(1) and (3)
VIL
–0.3
—
0.8
V
Output high
voltage
All output pins
VOH
VCC – 0.5
—
—
V
I OH = –200 µA
3.5
—
—
V
I OH = –1.0 mA
Output low
voltage
All output pins
—
—
0.4
V
I OL = 1.6 mA
—
—
1.0
V
I OL = 10.0 mA
—
—
10.0
µA
Vin = 0.5 V to
VCC – 0.5 V
STBY, NMI,
MD1, MD0
—
—
1.0
µA
P77 – P70
—
—
1.0
µA
P17 – P10,
P27 – P20
Input leakage RES
current
420
VOL
|Iin|
Vin = 0.5 V to
AVCC – 0.5 V
Table 19.2 DC Characteristics (5 V Version) (cont)
Item
Symbol Min
Typ
Max
Unit
Test
Conditions
Leakage
current in
3-state
(off state)
Ports 1, 2, 3,
4, 5, 6, 8, 9
|ITSI|
—
—
1.0
µA
Vin = 0.5 V to
VCC – 0.5 V
Input pull-up
MOS current
Ports 1, 2, 3
–I P
30
—
250
µA
Vin = 0 V
Input
capacitance
RES
Cin
Vin = 0 V,
f = 1 MHz,
Ta = 25°C
Current
dissipation* 3
—
—
60
pF
NMI
—
—
50
pF
All input pins
except RES
and NMI
—
—
15
pF
—
27
45
mA
f = 12 MHz
—
36
60
mA
f = 16 MHz
—
18
30
mA
f = 12 MHz
—
24
40
mA
f = 16 MHz
—
0.01
5.0
µA
Ta ≤ 50°C
—
—
20.0
µA
50°C < Ta
—
2.0
5.0
mA
—
0.01
5.0
µA
AVCC = 2.0 V
to 5.5 V
4.5
—
5.5
V
During
operation
2.0
—
5.5
V
During wait
state or when
not in use
2.0
—
—
V
Normal
operation
I CC
Sleep mode
Standby modes*
Analog supply During A/D
current
conversion
4
AI CC
Waiting
Analog supply voltage* 1
RAM standby voltage
AVCC
VRAM
Notes: 1. Connect AVCC to the power supply (VCC) and apply between 2.0 V and 5.5 V even when
the A/D converter is not used.
2. P86 to P8 0, P97, and P9 5 to P9 0 include peripheral function inputs multiplexed with these
pins.
3. Current dissipation values assume that VIH min = VCC – 0.5 V, VIL max = 0.5 V, all output
pins are in the no-load state, and all input pull-up transistors are off.
4. For these values it is assumed that V RAM ≤ V CC < 4.5 V and VIH min = VCC × 0.9,
VIL max = 0.3 V.
421
Table 19.3 DC Characteristics (4 V Version)
Conditions: VCC = 4.0 V to 5.5 V, AVCC = 4.0 V to 5.5 V*1, VSS = AVSS = 0 V, Ta = –20 to 75°C
(regular specifications), Ta = –40 to 85°C (wide-range specifications)
Item
Schmitt
trigger input
voltage
(1)
P86 – P8 0* 2,
P97, P95 – P90* 2,
FTCI, FTIA,
FTIB, FTIC,
FTID, FTI,
TMCI0, TMCI1,
TMRI0, TMRI1,
IRQ6, IRQ7,
ETMCI0, ETMCI1,
ETMRI0, ETMRI1
Symbol Min
Typ
Max
Unit
VT–
1.0
—
—
V
VT +
—
—
VCC × 0.7
V
VT+ –V T– 0.4
—
—
V
VT–
0.8
—
—
V
VT+
—
—
VCC × 0.7
V
—
—
V
VCC – 0.7
—
VCC + 0.3
V
2.0
—
AVCC + 0.3 V
VT+ –V T– 0.3
Input high
voltage
(2)
RES, STBY,
NMI, MD1, MD0,
EXTAL
VIH
P77 – P70
Test
Conditions
VCC = 4.5 V to
5.5 V
VCC = 4.0 V to
4.5 V
Input high
voltage
Input pins
other than
(1) and (2)
VIH
2.0
—
VCC + 0.3
V
Input low
voltage
(3)
RES, STBY,
MD1, MD0
VIL
–0.3
—
0.5
V
Input low
voltage
Input pins
other than
(1) and (3)
VIL
–0.3
—
0.8
V
VCC = 4.5 V to
5.5 V
–0.3
—
0.6
V
VCC = 4.0 V to
4.5 V
All output pins
VOH
VCC – 0.5
—
—
V
I OH = –200 µA
3.5
—
—
V
I OH = –1.0 mA,
VCC = 4.5 V to
5.5 V
2.8
—
—
V
I OH = –1.0 mA,
VCC = 4.0 V to
4.5 V
—
—
0.4
V
I OL = 1.6 mA
—
—
1.0
V
I OL = 10.0 mA
Output high
voltage
Output low
voltage
422
All output pins
P17 – P10,
P27 – P20
VOL
Table 19.3 DC Characteristics (4 V Version) (cont)
Test
Conditions
Item
Symbol Min
Typ
Max
Unit
Input leakage RES
current
|Iin|
—
—
10.0
µA
STBY, NMI,
MD1, MD0
—
—
1.0
µA
P77 – P70
—
—
1.0
µA
Vin = 0.5 V to
AVCC – 0.5 V
Vin = 0.5 V to
VCC – 0.5 V
Leakage
current in
3-state
(off state)
Ports 1, 2, 3,
4, 5, 6, 8, 9
|ITSI|
—
—
1.0
µA
Vin = 0.5 V to
VCC – 0.5 V
Input pull-up
MOS current
Ports 1, 2, 3
–I P
30
—
250
µA
Vin = 0 V,
VCC = 4.5 V to
5.5 V
20
—
200
µA
Vin = 0 V,
VCC = 4.0 V to
4.5 V
—
—
60
pF
NMI
—
—
50
pF
Vin = 0 V,
f = 1 MHz,
Ta = 25°C
All input pins
except RES
and NMI
—
—
15
pF
—
27
45
mA
f = 12 MHz
—
36
60
mA
f = 16 MHz,
VCC = 4.5 V to
5.5 V
—
18
30
mA
f = 12 MHz
—
24
40
mA
f = 16 MHz,
VCC = 4.5 V to
5.5 V
—
0.01
5.0
µA
Ta ≤ 50°C
—
—
20.0
µA
50°C < Ta
Input
capacitance
Current
dissipation* 3
RES
Normal
operation
Sleep mode
Standby modes* 4
Cin
I CC
423
Table 19.3 DC Characteristics (4 V Version) (cont)
Item
Symbol Min
Analog supply During A/D
current
conversion
AI CC
Waiting
Analog supply voltage* 1
RAM standby voltage
AVCC
VRAM
Test
Conditions
Typ
Max
Unit
—
2.0
5.0
mA
—
0.01
5.0
µA
AVCC = 2.0 V
to 5.5 V
4.0
—
5.5
V
During
operation
2.0
—
5.5
V
During wait
state or when
not in use
2.0
—
—
V
Notes: 1. Connect AVCC to the power supply (VCC) and apply between 2.0 V and 5.5 V even when
the A/D converter is not used.
2. P86 to P8 0, P97, and P9 5 to P9 0 include peripheral function inputs multiplexed with these
pins.
3. Current dissipation values assume that V IH min = VCC – 0.5 V, VIL max = 0.5 V, all output
pins are in the no-load state, and all input pull-up transistors are off.
4. For these values it is assumed that V RAM ≤ V CC < 4.0 V and VIH min = VCC × 0.9,
VIL max = 0.3 V.
424
Table 19.4 DC Characteristics (3 V Version)
Conditions: VCC = 2.7 V to 5.5 V, AVCC = 2.7 V to 5.5 V*1, VSS = AVSS = 0 V, Ta = –20 to 75°C
Item
Schmitt
trigger input
voltage
(1)
Input high
voltage
(2)
Symbol Min
Typ
Max
Unit
—
—
V
—
VCC × 0.7
V
—
—
V
VCC × 0.9
—
VCC + 0.3
V
VCC × 0.7
—
AVCC + 0.3 V
VCC × 0.15
P86–P80* 2,
VT–
2
P97, P95–P90* ,
FTCI, FTIA,
FTIB, FTIC,
—
VT +
FTID, FTI,
TMCI0, TMCI1,
TMRI0, TMRI1,
VT+ –V T– 0.2
IRQ6, IRQ7,
ETMCI0, ETMCI1,
ETMRI0, ETMRI1
RES, STBY,
NMI, MD1, MD0,
EXTAL
VIH
P77 – P70
Test
Conditions
Input high
voltage
Input pins
other than
(1) and (2)
VIH
VCC × 0.7
—
VCC + 0.3
V
Input low
voltage
(3)
RES, STBY,
MD1, MD0
VIL
–0.3
—
VCC × 0.1
V
Input low
voltage
Input pins
other than
(1) and (3)
VIL
–0.3
—
VCC × 0.15 V
Output high
voltage
All output pins
VOH
VCC – 0.5
—
—
V
I OH = –200 µA
VCC – 1.0
—
—
V
I OH = –1.0 mA
—
—
0.4
V
I OL = 0.8 mA
—
—
0.4
V
I OL = 1.6 mA
—
—
10.0
µA
Vin = 0.5 V to
VCC – 0.5 V
STBY, NMI,
MD1, MD0
—
—
1.0
µA
P77 – P70
—
—
1.0
µA
Output low
voltage
All output pins
VOL
P17 – P10,
P27 – P20
Input leakage RES
current
|Iin|
Vin = 0.5 V to
AVCC – 0.5 V
425
Table 19.4 DC Characteristics (3 V Version) (cont)
Item
Symbol Min
Typ
Max
Unit
Test
Conditions
Leakage
current in
3-state
(off state)
Ports 1, 2, 3,
4, 5, 6, 8, 9
|ITSI|
—
—
1.0
µA
Vin = 0.5 V to
VCC – 0.5 V
Input pull-up
MOS current
Ports 1, 2, 3
–I P
3
—
120
µA
Vin = 0 V,
VCC = 2.7 V to
4.0 V
Input
capacitance
RES
Cin
—
—
60
pF
NMI
—
—
50
pF
Vin = 0 V,
f = 1 MHz,
Ta = 25°C
All input pins
except RES
and NMI
—
—
15
pF
—
7
—
mA
f = 6 MHz,
VCC = 2.7 V to
3.6 V
—
12
22
mA
f = 10 MHz,
VCC = 2.7 V to
3.6 V
—
25
—
mA
f = 10 MHz,
VCC = 4.0 V to
5.5 V
—
5
—
mA
f = 6 MHz,
VCC = 2.7 V to
3.6 V
—
9
16
mA
f = 10 MHz,
VCC = 2.7 V to
3.6 V
—
18
—
mA
f = 10 MHz,
VCC = 4.0 V to
5.5 V
—
0.01
5.0
µA
Ta ≤ 50°C
—
—
20.0
µA
50°C < Ta
—
2.0
5.0
mA
—
0.01
5.0
µA
Current
dissipation* 3
Normal
operation
I CC
Sleep mode
Standby modes* 4
Analog supply During A/D
current
conversion
Waiting
426
AI CC
AVCC = 2.0 V
to 5.5 V
Table 19.4 DC Characteristics (3 V Version) (cont)
Test
Conditions
Item
Symbol Min
Typ
Max
Unit
Analog supply voltage* 1
AVCC
2.7
—
5.5
V
During
operation
2.0
—
5.5
V
During wait
state or when
not in use
2.0
—
—
V
RAM standby voltage
VRAM
Notes: 1. Connect AVCC to the power supply (VCC) and apply between 2.0 V and 5.5 V even when
the A/D converter is not used.
2. P86 to P8 0, P97, and P9 5 to P9 0 include peripheral function inputs multiplexed with these
pins.
3. Current dissipation values assume that V IH min = VCC – 0.5 V, VIL max = 0.5 V, all output
pins are in the no-load state, and all input pull-up transistors are off.
4. For these values it is assumed that V RAM ≤ V CC < 2.7 V and VIH min = VCC × 0.9,
VIL max = 0.3 V.
427
Table 19.5 Allowable Output Current Values (5 V and 4 V Versions)
Conditions: VCC = 4.0 V to 5.5 V, AVCC = 4.0 V to 5.5 V, VSS = AVSS = 0 V, Ta = –20 to 75°C
(regular specifications), Ta = –40 to 85°C (wide-range specifications)
Item
Allowable output low
current (per pin)
Allowable output low
current (total)
Ports 1 and 2
Symbol
Min
Typ
Max
Unit
I OL
—
—
10
mA
—
—
2
mA
—
—
80
mA
—
—
120
mA
Other output pins
Ports 1 and 2, total
ΣIOL
Total of all output
Allowable output high
current (per pin)
All output pins
–I OH
—
—
2
mA
Allowable output high
current (total)
Total of all output
Σ–IOH
—
—
40
mA
Table 19.6 Allowable Output Current Values (3 V Version)
Conditions: VCC = 2.7 V to 5.5 V, AVCC = 2.7 V to 5.5 V, VSS = AVSS = 0 V, Ta = –20 to 75°C
Item
Allowable output low
current (per pin)
Other output pins
Ports 1 and 2
Allowable output low
current (total)
Total of all output
Ports 1 and 2, total
Symbol
Min
Typ
Max
Unit
I OL
—
—
2
mA
—
—
1
mA
—
—
40
mA
—
—
60
mA
ΣIOL
Allowable output high
current (per pin)
All output pins
–I OH
—
—
2
mA
Allowable output high
current (total)
Total of all output
Σ–IOH
—
—
30
mA
428
Notes on Use: To ensure the reliability of the chip, the output current values shown in tables 19.5
and 19.6 should not be exceeded. When directly driving a Darlington transistor or LED, in
particular, a current-limiting resistance must be inserted (see figures 19.1 and 19.2).
H8/3318 chip
2 kΩ
Port
Darlington
transistor
Figure 19.1 Example of Circuit for Driving a Darlington Transistor
H8/3318 chip
VCC
600 Ω
Ports 1 or 2
LED
Figure 19.2 Example of Circuit for Driving an LED
19.2.2
AC Characteristics
The AC characteristics are listed in three tables. Bus timing parameters are given in table 19.7,
control signal timing parameters in table 19.8, timing parameters of the on-chip supporting
modules in table 19.9, and external clock output delay time in table 19.10.
429
Table 19.7 Bus Timing
Conditions A: VCC = 4.5 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C (regular specifications), Ta = –40 to 85°C (wide-range
specifications)
Conditions B: VCC = 4.0 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C (regular specifications), Ta = –40 to 85°C (wide-range
specifications)
Conditions C: VCC = 2.7 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C
Conditions C
Conditions B
Conditions A
10 MHz
12 MHz
16 MHz
Item
Symbol
Min
Max
Min
Max
Min
Max
Unit
Test
Conditions
Clock cycle time
tcyc
100
500
83.3
500
62.5
500
ns
Fig. 19.4
Clock pulse width low
tCL
30
—
30
—
20
—
ns
Clock pulse width high
tCH
30
—
30
—
20
—
ns
Clock rise time
tCr
—
20
—
10
—
10
ns
Clock fall time
tCf
—
20
—
10
—
10
ns
Address delay time
tAD
—
50
—
35
—
30
ns
Address hold time
tAH
20
—
15
—
10
—
ns
Address strobe delay time tASD
—
50
—
35
—
30
ns
Write strobe delay time
tWSD
—
50
—
35
—
30
ns
Strobe delay time
tSD
—
50
—
35
—
30
ns
Write strobe pulse width*
tWSW
110
—
90
—
60
—
ns
Address setup time 1*
tAS1
15
—
10
—
10
—
ns
Address setup time 2*
tAS2
65
—
50
—
40
—
ns
Read data setup time
tRDS
35
—
20
—
20
—
ns
Read data hold time*
tRDH
0
—
0
—
0
—
ns
Read data access time*
tACC
—
170
—
160
—
110
ns
Write data delay time
tWDD
—
75
—
60
—
60
ns
Write data setup time
tWDS
5
—
5
—
5
—
ns
Write data hold time
tWDH
20
—
20
—
20
—
ns
Wait setup time
tWTS
40
—
35
—
30
—
ns
Wait hold time
tWTH
10
—
10
—
10
—
ns
Note: * Values at maximum operating frequency
430
Fig. 19.5
Table 19.8 Control Signal Timing
Conditions A: VCC = 4.5 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C (regular specifications), Ta = –40 to 85°C (wide-range
specifications)
Conditions B: VCC = 4.0 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C (regular specifications), Ta = –40 to 85°C (wide-range
specifications)
Conditions C: VCC = 2.7 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C
Conditions C
Conditions B
Conditions A
10 MHz
12 MHz
16 MHz
Item
Symbol
Min
Max
Min
Max
Min
Max
Unit
Test
Conditions
RES setup time
tRESS
300
—
200
—
200
—
ns
Fig. 19.6
RES pulse width
tRESW
10
—
10
—
10
—
tcyc
NMI setup time
(NMI, IRQ0 to IRQ7)
tNMIS
300
—
150
—
150
—
ns
NMI hold time
(NMI, IRQ0 to IRQ7)
tNMIH
10
—
10
—
10
—
ns
Interrupt pulse width
for recovery from software
standby mode
(NMI, IRQ0 to IRQ2, IRQ6)
tNMIW
300
—
200
—
200
—
ns
Crystal oscillator settling
time (power-on reset)
tOSC1
20
—
20
—
20
—
ms
Fig. 19.8
Crystal oscillator settling
time (software standby)
tOSC2
8
—
8
—
8
—
ms
Fig. 19.9
Fig. 19.7
431
• Test Conditions for AC Characteristics
5V
RL
LSI
output pin
RH
C = 90 pF: Ports 1–4, 6, 9
30 pF: Ports 5, 8
RL = 2.4 kΩ
RH = 12 kΩ
C
Input/output timing measurement levels
Low: 0.8 V
High: 2.0 V
Figure 19.3 Output Load Circuit
432
Table 19.9 Timing Conditions of On-Chip Supporting Modules
Conditions A: VCC = 4.5 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C (regular specifications), Ta = –40 to 85°C (wide-range
specifications)
Conditions B: VCC = 4.0 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C (regular specifications), Ta = –40 to 85°C (wide-range
specifications)
Conditions C: VCC = 2.7 V to 5.5 V, VSS = 0 V, ø = 2 MHz to maximum operating frequency,
Ta = –20 to 75°C
TMR
Conditions B
Conditions A
10 MHz
12 MHz
16 MHz
Symbol
Min
Max
Min
Max
Min
Max
Unit
Test
Conditions
Timer output
delay time
tFTOD
—
150
—
100
—
100
ns
Fig. 19.10
Timer input
setup time
tFTIS
80
—
50
—
50
—
ns
Timer clock
input setup
time
tFTCS
80
—
50
—
50
—
ns
Timer clock
pulse width
tFTCWH
tFTCWL
1.5
—
1.5
—
1.5
—
tcyc
Timer output
delay time
tTMOD
—
150
—
100
—
100
ns
Fig. 19.12
Timer reset
input setup
time
tTMRS
80
—
50
—
50
—
ns
Fig. 19.14
Timer clock
input setup
time
tTMCS
80
—
50
—
50
—
ns
Fig. 19.13
Timer clock
pulse width
(single edge)
tTMCWH
1.5
—
1.5
—
1.5
—
tcyc
Timer clock
pulse width
(both edges)
tTMCWL
2.5
—
2.5
—
2.5
—
tcyc
Item
FRT
Conditions C
Fig. 19.11
433
Table 19.9 Timing Conditions of On-Chip Supporting Modules (cont)
Conditions C
Conditions B
Conditions A
10 MHz
12 MHz
16 MHz
Min
Max
Min
Max
Min
Max
Unit
Test
Conditions
Input (Async) tscyc
clock (Sync) t
scyc
cycle
4
—
4
—
4
—
tcyc
Fig. 19.15
6
—
6
—
6
—
tcyc
Transmit data
delay time
(Sync)
tTXD
—
200
—
100
—
100
ns
Receive data
setup time
(Sync)
tRXS
150
—
100
—
100
—
ns
Receive data
hold time
(Sync)
tRXH
150
—
100
—
100
—
ns
Input clock
pulse width
tSCKW
0.4
0.6
0.4
0.6
0.4
0.6
tscyc
Fig. 19.16
Output data
delay time
tPWD
—
150
—
100
—
100
ns
Fig. 19.17
Input data
setup time
tPRS
80
—
50
—
50
—
ns
Input data hold tPRH
time
80
—
50
—
50
—
ns
TPC
Output data
delay time
tTPD
—
100
—
100
—
100
ns
Fig. 19.18
DPRAM
read/write
cycle
Address hold
time
tRSH
10
—
10
—
10
—
ns
Fig. 19.19,
Fig. 19.20
Chip select
hold time
tCSH
10
—
10
—
10
—
ns
Address setup
time
tRSS
10
—
10
—
10
—
ns
Chip select
setup time
tCSS
10
—
10
—
10
—
ns
DPRAM
Write pulse
write cycle width
tDWP
65
—
65
—
65
—
ns
tDDW
35
—
35
—
35
—
ns
Write data hold tDDH
time
20
—
20
—
20
—
ns
Item
SCI
Ports
Symbol
Write data
setup time
434
Fig. 19.19
Table 19.9 Timing Conditions of On-Chip Supporting Modules (cont)
Conditions C
Conditions B
Conditions A
10 MHz
12 MHz
16 MHz
Symbol
Min
Max
Min
Max
Min
Max
Unit
Test
Conditions
Access time
tDAA
—
100
—
85
—
85
ns
Fig. 19.20
Read data
delay time
tDOE
—
85
—
85
—
85
ns
Chip select
access time
tDACS
—
100
—
85
—
85
ns
CS output
floating time
tDCHZ
0
50
0
50
0
50
ns
OE output
floating time
tDOHZ
0
50
0
50
0
50
ns
DPRAM
WRQ
output
Wait request
delay time 1
tWTD1
—
80
—
50
—
50
ns
Wait request
delay time 2
tWTD2
20
—
20
—
20
—
ns
Byte
access
interval in
DPRAM
bound
buffer
mode
Byte access
interval 0
tBYTE0
2
—
2
—
2
—
tcyc
Byte access
interval 1
tBYTE1
20
—
20
—
20
—
ns
Byte access
interval 2
tBYTE2
9.5
—
9.5
—
9.5
—
tcyc
Byte
access
interval in
DPRAM
buffer
query
mode
Byte access
interval 3
tBYTE3
11
—
11
—
11
—
tcyc
tHRDYD1
—
80
—
80
—
80
ns
tHRDYD2
—
80
—
80
—
80
ns
Receive data
setup time
tTDS
20
—
20
—
20
—
ns
Receive data
hold time
tTDH
25
—
25
—
25
—
ns
Handshake
pulse width
tHDWP
300
—
300
—
300
—
ns
Item
DPRAM
read cycle
Parallel
RDY output
handshake delay time 1
interface
RDY output
receive
delay time 2
Fig. 19.21
Fig. 19.22
Fig. 19.23
435
Table 19.9 Timing Conditions of On-Chip Supporting Modules (cont)
Conditions C
Conditions B
Conditions A
10 MHz
12 MHz
16 MHz
Item
Symbol
Min
Max
Min
Max
Min
Max
Unit
Test
Conditions
Parallel
WRQ output
handshake delay time 1
interface
WRQ output
transmit
delay time 2
tHWRQD1
—
80
—
80
—
80
ns
Fig. 19.24
tHWRQD2
—
80
—
80
—
80
ns
Note: Values at maximum operating frequency
Table 19.10 External Clock Output Stabilization Delay Time
Conditions: VCC = 2.7 to 5.5 V, AVCC = 2.7 to 5.5 V, VSS = AVSS = 0 V
Item
Symbol
Min
Max
Unit
Notes
External clock output stabilization
delay time
t DEXT*
500
—
µs
Fig. 19.25
Note: * t DEXT includes a 10 tcyc RES pulse width (t RESW).
436
19.2.3
A/D Converter Characteristics
Table 19.11 lists the characteristics of the on-chip A/D converter.
Table 19.11 A/D Converter Characteristics
Conditions A: VCC = 4.5 V to 5.5 V, AVCC = 4.5 V to 5.5 V, VSS = AVSS = 0 V, ø = 2 MHz to
maximum operating frequency, Ta = –20 to 75°C (regular specifications),
Ta = –40 to 85°C (wide-range specifications)
Conditions B: VCC = 4.0 V to 5.5 V, AVCC = 4.0 V to 5.5 V, VSS = AVSS = 0 V, ø = 2 MHz to
maximum operating frequency, Ta = –20 to 75°C (regular specifications),
Ta = –40 to 85°C (wide-range specifications)
Conditions C: VCC = 2.7 V to 5.5 V, AVCC = 2.7 V to 5.5 V, VSS = AVSS = 0 V, ø = 2 MHz to
maximum operating frequency, Ta = –20 to 75°C
Conditions C
Conditions B
Conditions A
10 MHz
12 MHz
16 MHz
Item
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Unit
Resolution
10
10
10
10
10
10
10
10
10
Bits
Conversion time (single
mode)*
—
—
13.4
—
—
11.2
—
—
8.4
µs
Analog input capacitance
—
—
20
—
—
20
—
—
20
pF
Allowable signal source
impedance
—
—
5
—
—
10
—
—
10
kΩ
Nonlinearity error
—
—
±6.0
—
—
±3.0
—
—
±3.0
LSB
Offset error
—
—
±4.0
—
—
±3.5
—
—
±3.5
LSB
Full-scale error
—
—
±4.0
—
—
±3.5
—
—
±3.5
LSB
Quantizing error
—
—
±0.5
—
—
±0.5
—
—
±0.5
LSB
Absolute accuracy
—
—
±8.0
—
—
±4.0
—
—
±4.0
LSB
Note: * Values at maximum operating frequency
437
19.3
MCU Operational Timing
This section provides the following timing charts:
19.3.1
19.3.2
19.3.3
19.3.4
19.3.5
19.3.6
19.3.7
19.3.8
19.3.9
Bus Timing
Control Signal Timing
16-Bit Free-Running Timer Timing
8-Bit Timer Timing
SCI Timing
I/O Port Timing
TPC Timing
DPRAM Timing
External Clck Output Timing
19.3.1
Figures 19.4 to 19.5
Figures 19.6 to 19.9
Figures 19.10 to 19.11
Figures 19.12 to 19.14
Figures 19.15 and 19.16
Figure 19.17
Figure 19.18
Figure 19.19 to 19.24
Figure 19.25
Bus Timing
(1) Basic Bus Cycle (without Wait States) in Expanded Modes
T1
T2
T3
t cyc
t CH
tCL
ø
t Cf
t AD
t Cr
A15 to A0
t ASD
t SD
t AH
t ASI
AS, RD
D7 to D0
(read)
t WSD
t AS2
tRDH
tRDS
t ACC
t SD
tWSW
t AH
WR
tWDD
t WDS
t WDH
D7 to D0
(write)
Figure 19.4 Basic Bus Cycle (without Wait States) in Expanded Modes
438
(2) Basic Bus Cycle (with 1 Wait State) in Expanded Modes
T2
T1
TW
T3
Ø
A15 to A0
AS, RD
D7 to D0
(read)
WR
D7 to D0
(write)
t WTS
t WTH
t WTS
t WTH
WAIT
Figure 19.5 Basic Bus Cycle (with 1 Wait State) in Expanded Modes (Modes 1, 2)
19.3.2
Control Signal Timing
(1) Reset Input Timing
ø
tRESS
tRESS
RES
tRESW
Figure 19.6 Reset Input Timing
439
(2) Interrupt Input Timing
ø
tNMIS
NMI
IRQE (edge)
tNMIH
tNMIS
IRQL (level)
tNMIW
NMI
IRQi
Note: i = 0 to 7; IRQE: IRQi when edge-sensed; IRQL: IRQi when level-sensed
Figure 19.7 Interrupt Input Timing
(3) Clock Settling Timing
ø
VCC
STBY
tOSC1
tOSC1
RES
Figure 19.8 Clock Settling Timing
440
(4) Clock Settling Timing for Recovery from Software Standby Mode
ø
NMI
IRQ1
tOSC2
(i = 0, 1, 2, 6)
Figure 19.9 Clock Settling Timing for Recovery from Software Standby Mode
19.3.3
16-Bit Free-Running Timer Timing
(1) Free-Running Timer Input/Output Timing
ø
Free-running
timer counter
Compare-match
tFTOD
FTOA0, FTOB0,
FTOA1, FTOB1
tFTIS
FTI, FTIA, FTIB,
FTIC, FTID
Figure 19.10 Free-Running Timer Input/Output Timing
441
(2) External Clock Input Timing for Free-Running Timer
ø
tFTCS
FTCI
tFTCWL
tFTCWH
Figure 19.11 External Clock Input Timing for Free-Running Timer
19.3.4
8-Bit Timer Timing
(1) 8-Bit Timer Output Timing
ø
Timer
counter
Compare-match
tTMOD
TMO0,
TMO1
Figure 19.12 8-Bit Timer Output Timing
(2) 8-Bit Timer Clock Input Timing
ø
tTMCS
tTMCS
TMCI0,
TMCI1
tTMCWL
tTMCWH
Figure 19.13 8-Bit Timer Clock Input Timing
442
(3) 8-Bit Timer Reset Input Timing
ø
tTMRS
TMRI0,
TMRI1
Timer
counter
H'00
N
Figure 19.14 8-Bit Timer Reset Input Timing
19.3.5
Serial Communication Interface Timing
(1) SCI Input/Output Timing
tScyc
Serial clock
(SCK0, SCK1)
tTXD
Transmit data
(TxD0, TxD1)
tRXS
tRXH
Receive data
(RxD0, RxD1)
Figure 19.15 SCI Input/Output Timing (Synchronous Mode)
(2) SCI Input Clock Timing
tSCKW
SCK0, SCK1
tScyc
Figure 19.16 SCI Input Clock Timing
443
19.3.6
I/O Port Timing
Port read/write cycle
T1
T2
T3
ø
tPRS
tPRH
Port 1 to
port 9 (input)
tPWD
Port 1* to
port 9 (output)
Note: * Except P96 and P77 to P70
Figure 19.17 I/O Port Input/Output Timing
19.3.7
Timing Pattern Controller Timing
ø
tTPD
TP
Figure 19.18 Timing Pattern Controller Timing
444
19.3.8
DPRAM Timing
Explanation of Notation in Figure 19.21 and 19.22: The numbers 0, 1, and 2 used to describe a
data register state indicate 0, 1, and 2 bytes are available, respectively. They also indicate that the
data register is being accessed.
(1) DPRAM Write Cycle
RS0–RS2
CS
tCSH
tCSS
tRSS
tDWP
tRSH
WE
tDDW
tDDH
DDB0–DDB7
Figure 19.19 DPRAM Write Timing
445
(2) DPRAM Read Cycle
RS0–RS2
tDAA
CS
tCSH
tCSS
tRSS
tRSH
OE
tDOE
tDCHZ
tDACS
tDOHZ
DDB0–DDB7
Figure 19.20 DPRAM Read Timing
(3) WRQ Output Timing
Data register
state
1
0
Other than 0
0
WE, OE
tWTD1
tWTD2
WRQ
Figure 19.21 WRQ Output Timing
446
tWTD1
(4) Strobe Interval, Access Interval
Data register
state
2
1
1
tBYTE0
0
0
tBYTE1
WE, OE
Figure 19.22 (a) Strobe Interval and Access Interval (with WRQ)
Data register
state
2
1
0
Other than 0
1
0
tBYTE2
WE, OE
Figure 19.22 (b) Access Interval in Bound Buffer Mode (without WRQ)
CS, RS0–RS2
Selected
Not selected
Selected
tBYTE3
WE
OE
Figure 19.22 (c) Access Interval during Buffer Query Mode (without WRQ)
447
(5) Receive Timing of Parallel Handshake Interface
ø
tHDWP
WE
tHRDYD1
tHRDYD2
RDY
DDB0–DDB7
tTOS
tTDH
Figure 19.23 Receive Timing in Handshake Mode
(6) Transmit Timing of Parallel Handshake Interface
ø
OE
tHWRQD1
tHWRQD2
WRQ
DDB0–DDB7
tDOE
Figure 19.24 Transmit Timing in Handshake Mode
448
tDOHZ
19.3.9
External Clock Output Timing
VCC
STBY
2.7 V
VIH
EXTAL
ø
(internal or
external)
RES
tDEXT*
Note: * tDEXT includes a 10 tcyc RES pulse width (tRESW).
Figure 19.25 External Clock Output Stabilization Delay Time
449
Appendix A CPU Instruction Set
A.1
Instruction Set List
Operation Notation
Rd8/16
General register (destination) (8 or 16 bits)
Rs8/16
General register (source) (8 or 16 bits)
Rn8/16
General register (8 or 16 bits)
CCR
Condition code register
N
N (negative) flag in CCR
Z
Z (zero) flag in CCR
V
V (overflow) flag in CCR
C
C (carry) flag in CCR
PC
Program counter
SP
Stack pointer
#xx:3/8/16
Immediate data (3, 8, or 16 bits)
d:8/16
Displacement (8 or 16 bits)
@aa:8/16
Absolute address (8 or 16 bits)
+
Addition
–
Subtraction
×
Multiplication
÷
Division
∧
AND logical
∨
OR logical
⊕
Exclusive OR logical
→
—
Move
Not
Condition Code Notation
Modified according to the instruction result
*
Undetermined (unpredictable)
0
Always cleared to 0
—
Not affected by the instruction result
451
Instruction Set
@Rn
@(d:16, Rn)
@–Rn/@Rn+
@aa: 8/16
@(d:8, PC)
@@aa
Implied
Operation
#xx: 8/16
Rn
Mnemonic
Operand Size
Addressing Mode/
Instruction Length
Condition Code
I
H N Z V C
MOV.B @Rs+, Rd
B @Rs16 → Rd8
Rs16+1 → Rs16
MOV.B @aa:8, Rd
B @aa:8 → Rd8
2
— —
MOV.B @aa:16, Rd
B @aa:16 → Rd8
4
— —
MOV.B Rs, @Rd
B Rs8 → @Rd16
MOV.B Rs, @(d:16, Rd)
B Rs8 → @(d:16, Rd16)
MOV.B Rs, @–Rd
B Rd16–1 → Rd16
Rs8 → @Rd16
MOV.B Rs, @aa:8
B Rs8 → @aa:8
2
— —
MOV.B Rs, @aa:16
B Rs8 → @aa:16
4
— —
MOV.W #xx:16, Rd
W #xx:16 → Rd16
MOV.W Rs, Rd
W Rs16 → Rd16
MOV.W @Rs, Rd
W @Rs16 → Rd16
↔ ↔ ↔ ↔ ↔
↔ ↔ ↔ ↔ ↔
B @(d:16, Rs16) → Rd8
↔ ↔ ↔ ↔ ↔
↔ ↔ ↔ ↔ ↔
B @Rs16 → Rd8
MOV.B @(d:16, Rs), Rd
0 — 4
↔ ↔ ↔ ↔ ↔ ↔ ↔
↔ ↔ ↔ ↔ ↔ ↔ ↔
MOV.B @Rs, Rd
0 — 2
0 — 4
0 — 6
MOV.W Rs, @–Rd
W Rd16–2 → Rd16
Rs16 → @Rd16
↔ ↔ ↔ ↔
↔ ↔ ↔ ↔
B Rs8 → Rd8
MOV.W Rs, @aa:16
W Rs16 → @aa:16
0 — 6
POP Rd
W @SP → Rd16
SP+2 → SP
2
— —
↔ ↔
↔ ↔
B #xx:8 → Rd8
MOV.B Rs, Rd
PUSH Rs
W SP–2 → SP
Rs16 → @SP
2
— —
↔
↔
MOV.B #xx:8, Rd
No. of States
Table A.1
0 — 6
2
— —
2
— —
2
W @Rs16 → Rd16
Rs16+2 → Rs16
MOV.W @aa:16, Rd
W @aa:16 → Rd16
MOV.W Rs, @Rd
W Rs16 → @Rd16
MOV.W Rs, @(d:16, Rd) W Rs16 → @(d:16, Rd16)
452
— —
2
— —
2
— —
4
— —
2
— —
4
— —
2
— —
2
MOV.W @(d:16, Rs), Rd W @(d:16, Rs16) → Rd16
MOV.W @Rs+, Rd
— —
4
— —
4
— —
2
— —
4
2
— —
— —
4
— —
2
— —
4
— —
0 — 2
0 — 4
0 — 6
0 — 6
0 — 6
0 — 4
0 — 6
0 — 6
0 — 6
0 — 4
0 — 2
0 — 4
0 — 6
0 — 6
0 — 4
0 — 6
0 — 6
0 — 6
Instruction Set (cont)
ADD.B #xx:8, Rd
B Rd8+#xx:8 → Rd8
ADD.B Rs, Rd
B Rd8+Rs8 → Rd8
ADD.W Rs, Rd
W Rd16+Rs16 → Rd16
ADDX.B #xx:8, Rd
B Rd8+#xx:8 +C → Rd8
H N Z V C
—
↔
↔
↔
↔
↔
B Not supported
I
2
2
—
↔
↔
↔
↔
↔
B Not supported
MOVTPE Rs, @aa:16
Condition Code
2
2
↔ ↔
↔ ↔ ↔
↔
↔ ↔ ↔
↔ ↔ ↔
MOVFPE @aa:16, Rd
@Rn
@(d:16, Rn)
@–Rn/@Rn+
@aa: 8/16
@(d:8, PC)
@@aa
Implied
Operation
#xx: 8/16
Rn
Mnemonic
Operand Size
Addressing Mode/
Instruction Length
No. of States
Table A.1
— (1)
2
2
2
—
(2)
2
(2)
2
B Rd8+Rs8 +C → Rd8
2
—
ADDS.W #1, Rd
W Rd16+1 → Rd16
2
— — — — — — 2
ADDS.W #2, Rd
W Rd16+2 → Rd16
2
— — — — — — 2
INC.B Rd
B Rd8+1 → Rd8
2
— —
— 2
DAA.B Rd
B Rd8 decimal adjust → Rd8
2
— *
* (3) 2
SUB.B Rs, Rd
B Rd8–Rs8 → Rd8
2
—
SUB.W Rs, Rd
W Rd16–Rs16 → Rd16
2
— (1)
SUBX.B #xx:8, Rd
B Rd8–#xx:8 –C → Rd8
↔ ↔
↔ ↔ ↔
↔
↔ ↔ ↔
↔ ↔ ↔
2
(2)
2
B Rd8–Rs8 –C → Rd8
2
—
SUBS.W #1, Rd
W Rd16–1 → Rd16
2
— — — — — — 2
SUBS.W #2, Rd
W Rd16–2 → Rd16
2
— — — — — — 2
DEC.B Rd
B Rd8–1 → Rd8
2
— —
— 2
DAS.B Rd
B Rd8 decimal adjust → Rd8
2
— *
* — 2
NEG.B Rd
B 0–Rd8 → Rd8
2
—
2
CMP.B #xx:8, Rd
B Rd8–#xx:8
—
2
CMP.B Rs, Rd
B Rd8–Rs8
2
—
2
CMP.W Rs, Rd
W Rd16–Rs16
2
— (1)
2
MULXU.B Rs, Rd
B Rd8 × Rs8 → Rd16
2
— — — — — — 14
DIVXU.B Rs, Rd
B Rd16÷Rs8 → Rd16
(RdH: remainder,
RdL: quotient)
2
— — (6) (7) — — 14
AND.B #xx:8, Rd
B Rd8∧#xx:8 → Rd8
AND.B Rs, Rd
B Rd8∧Rs8 → Rd8
2
2
— —
2
— —
↔ ↔
↔ ↔
SUBX.B Rs, Rd
↔
↔ ↔ ↔
↔ ↔ ↔
↔
↔
↔
2
↔
↔
↔
↔
↔
(2)
↔
↔
↔
↔
↔
—
2
↔
↔
↔
↔
2
↔
↔ ↔ ↔
↔ ↔ ↔
↔
↔
↔
ADDX.B Rs, Rd
0 — 2
0 — 2
453
Instruction Set (cont)
— —
2
— —
2
— —
2
— —
2
— —
2
— —
2
— —
2
— —
2
— —
C
0
b7
SHAR.B Rd
SHLL.B Rd
B
C
B
ROTXL.B Rd
B
C
0
C
ROTL.B Rd
B
C
b7
454
2
0
2
0
2
0
2
0
2
b0
C
b0
B
C
b7
0
0 — 2
b0
C
b7
ROTR.B Rd
2
0 — 2
b0
b7
B
0
0 — 2
b0
0
b7
ROTXR.B Rd
2
0 — 2
b0
b7
SHLR.B Rd
0
0 — 2
b0
B
b7
2
↔
2
B
↔
B Rd → Rd
SHAL.B Rd
↔
NOT.B Rd
↔
— —
— —
↔
2
2
↔
B Rd8⊕Rs8 → Rd8
— —
↔
B Rd8⊕#xx:8 → Rd8
XOR.B Rs, Rd
— —
2
↔ ↔ ↔ ↔ ↔ ↔
↔ ↔ ↔ ↔ ↔ ↔
↔
↔
XOR.B #xx:8, Rd
2
↔
↔
B Rd8∨Rs8 → Rd8
↔
↔
B Rd8∨#xx:8 → Rd8
OR.B Rs, Rd
↔
↔
OR.B #xx:8, Rd
↔
↔
H N Z V C
↔
↔
I
No. of States
Condition Code
↔
↔
@Rn
@(d:16, Rn)
@–Rn/@Rn+
@aa: 8/16
@(d:8, PC)
@@aa
Implied
Operation
#xx: 8/16
Rn
Mnemonic
Operand Size
Addressing Mode/
Instruction Length
↔
↔
Table A.1
b0
Instruction Set (cont)
BSET #xx:3, Rd
B (#xx:3 of Rd8) ← 1
BSET #xx:3, @Rd
B (#xx:3 of @Rd16) ← 1
BSET #xx:3, @aa:8
B (#xx:3 of @aa:8) ← 1
BSET Rn, Rd
B (Rn8 of Rd8) ← 1
BSET Rn, @Rd
B (Rn8 of @Rd16) ← 1
BSET Rn, @aa:8
B (Rn8 of @aa:8) ← 1
BCLR #xx:3, Rd
B (#xx:3 of Rd8) ← 0
BCLR #xx:3, @Rd
B (#xx:3 of @Rd16) ← 0
BCLR #xx:3, @aa:8
B (#xx:3 of @aa:8) ← 0
BCLR Rn, Rd
B (Rn8 of Rd8) ← 0
BCLR Rn, @Rd
B (Rn8 of @Rd16) ← 0
BCLR Rn, @aa:8
B (Rn8 of @aa:8) ← 0
BNOT #xx:3, Rd
B (#xx:3 of Rd8) ←
(#xx:3 of Rd8)
BNOT #xx:3, @Rd
B (#xx:3 of @Rd16) ←
(#xx:3 of @Rd16)
BNOT #xx:3, @aa:8
B (#xx:3 of @aa:8) ←
(#xx:3 of @aa:8)
BNOT Rn, Rd
B (Rn8 of Rd8) ←
(Rn8 of Rd8)
BNOT Rn, @Rd
B (Rn8 of @Rd16) ←
(Rn8 of @Rd16)
BNOT Rn, @aa:8
B (Rn8 of @aa:8) ←
(Rn8 of @aa:8)
BTST #xx:3, Rd
B (#xx:3 of Rd8) → Z
BTST #xx:3, @Rd
B (#xx:3 of @Rd16) → Z
BTST #xx:3, @aa:8
B (#xx:3 of @aa:8) → Z
BTST Rn, Rd
B (Rn8 of Rd8) → Z
BTST Rn, @Rd
B (Rn8 of @Rd16) → Z
BTST Rn, @aa:8
B (Rn8 of @aa:8) → Z
2
Condition Code
I
H N Z V C
No. of States
@Rn
@(d:16, Rn)
@–Rn/@Rn+
@aa: 8/16
@(d:8, PC)
@@aa
Implied
Operation
#xx: 8/16
Rn
Mnemonic
Operand Size
Addressing Mode/
Instruction Length
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — —
4
— — —
4
2
— — —
— — —
4
— — —
4
— — —
↔ ↔ ↔ ↔ ↔ ↔
Table A.1
— — 2
— — 6
— — 6
— — 2
— — 6
— — 6
455
Instruction Set (cont)
B (#xx:3 of Rd8) → C
BLD #xx:3, @Rd
B (#xx:3 of @Rd16) → C
BLD #xx:3, @aa:8
B (#xx:3 of @aa:8) → C
BILD #xx:3, Rd
B (#xx:3 of Rd8) → C
BILD #xx:3, @Rd
B (#xx:3 of @Rd16) → C
BILD #xx:3, @aa:8
B (#xx:3 of @aa:8) → C
BST #xx:3, Rd
B C → (#xx:3 of Rd8)
BST #xx:3, @Rd
B C → (#xx:3 of @Rd16)
BST #xx:3, @aa:8
B C → (#xx:3 of @aa:8)
BIST #xx:3, Rd
B C → (#xx:3 of Rd8)
BIST #xx:3, @Rd
B C → (#xx:3 of @Rd16)
BIST #xx:3, @aa:8
B C → (#xx:3 of @aa:8)
BAND #xx:3, Rd
B C∧(#xx:3 of Rd8) → C
BAND #xx:3, @Rd
B C∧(#xx:3 of @Rd16) → C
BAND #xx:3, @aa:8
B C∧(#xx:3 of @aa:8) → C
BIAND #xx:3, Rd
B C∧(#xx:3 of Rd8) → C
BIAND #xx:3, @Rd
B C∧(#xx:3 of @Rd16) → C
BIAND #xx:3, @aa:8
B C∧(#xx:3 of @aa:8) → C
BOR #xx:3, Rd
B C∨(#xx:3 of Rd8) → C
BOR #xx:3, @Rd
B C∨(#xx:3 of @Rd16) → C
BOR #xx:3, @aa:8
B C∨(#xx:3 of @aa:8) → C
BIOR #xx:3, Rd
B C∨(#xx:3 of Rd8) → C
BIOR #xx:3, @Rd
B C∨(#xx:3 of @Rd16) → C
BIOR #xx:3, @aa:8
B C∨(#xx:3 of @aa:8) → C
BXOR #xx:3, Rd
B C⊕(#xx:3 of Rd8) → C
BXOR #xx:3, @Rd
B C⊕(#xx:3 of @Rd16) → C
BXOR #xx:3, @aa:8
B C⊕(#xx:3 of @aa:8) → C
BIXOR #xx:3, Rd
B C⊕(#xx:3 of Rd8) → C
456
2
H N Z V C
— — — — —
4
2
— — — — —
— — — — —
4
— — — — —
4
2
— — — — —
No. of States
I
— — — — —
4
2
6
6
2
6
6
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — — — — — 2
4
— — — — — — 8
4
2
— — — — — — 8
— — — — —
4
— — — — —
4
2
— — — — —
— — — — —
4
— — — — —
4
2
— — — — —
— — — — —
4
— — — — —
4
2
— — — — —
— — — — —
4
— — — — —
4
2
— — — — —
— — — — —
4
— — — — —
4
2
Condition Code
↔ ↔ ↔ ↔ ↔ ↔
BLD #xx:3, Rd
@Rn
@(d:16, Rn)
@–Rn/@Rn+
@aa: 8/16
@(d:8, PC)
@@aa
Implied
Operation
#xx: 8/16
Rn
Mnemonic
Operand Size
Addressing Mode/
Instruction Length
— — — — —
— — — — —
↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔ ↔
Table A.1
2
6
6
2
6
6
2
6
6
2
6
6
2
6
6
2
Instruction Set (cont)
Branching
Condition
@Rn
@(d:16, Rn)
@–Rn/@Rn+
@aa: 8/16
@(d:8, PC)
@@aa
Implied
Operation
#xx: 8/16
Rn
Mnemonic
Operand Size
Addressing Mode/
Instruction Length
Condition Code
I
No. of States
Table A.1
H N Z V C
B C⊕(#xx:3 of @Rd16) → C
BIXOR #xx:3, @aa:8
B C⊕(#xx:3 of @aa:8) → C
BRA d:8 (BT d:8)
— PC ← PC+d:8
2
— — — — — — 4
BRN d:8 (BF d:8)
— PC ← PC+2
2
— — — — — — 4
BHI d:8
C∨Z=0
2
— — — — — — 4
C∨Z=1
2
— — — — — — 4
C=0
2
— — — — — — 4
C=1
2
— — — — — — 4
Z=0
2
— — — — — — 4
BEQ d:8
— If
condition
—
is true
— then
— PC ←
PC+d:8
— else next;
—
Z=1
2
— — — — — — 4
BVC d:8
—
V=0
2
— — — — — — 4
BVS d:8
—
V=1
2
— — — — — — 4
BPL d:8
—
N=0
2
— — — — — — 4
BMI d:8
—
N=1
2
— — — — — — 4
BGE d:8
—
N⊕V = 0
2
— — — — — — 4
BLT d:8
—
N⊕V = 1
2
— — — — — — 4
BGT d:8
—
Z ∨ (N⊕V) = 0
2
— — — — — — 4
BLE d:8
—
Z ∨ (N⊕V) = 1
2
— — — — — — 4
JMP @Rn
— PC ← Rn16
JMP @aa:16
— PC ← aa:16
JMP @@aa:8
— PC ← @aa:8
BSR d:8
— SP–2 → SP
PC → @SP
PC ← PC+d:8
JSR @Rn
— SP–2 → SP
PC → @SP
PC ← Rn16
JSR @aa:16
— SP–2 → SP
PC → @SP
PC ← aa:16
BLS d:8
BCC d:8 (BHS d:8)
BCS d:8 (BLO d:8)
BNE d:8
4
— — — — —
4
— — — — —
2
↔ ↔
BIXOR #xx:3, @Rd
6
6
— — — — — — 4
4
— — — — — — 6
2
2
2
— — — — — — 8
— — — — — — 6
— — — — — — 6
4
— — — — — — 8
457
Instruction Set (cont)
Condition Code
JSR @@aa:8
— SP–2 → SP
PC → @SP
PC ← @aa:8
RTS
— PC ← @SP
SP+2 → SP
2 — — — — — — 8
RTE
— CCR ← @SP
SP+2 → SP
PC ← @SP
SP+2 → SP
2
SLEEP
— Transit to sleep mode.
2 — — — — — — 2
LDC #xx:8, CCR
B #xx:8 → CCR
LDC Rs, CCR
B Rs8 → CCR
STC CCR, Rd
B CCR → Rd8
ANDC #xx:8, CCR
B CCR∧#xx:8 → CCR
2
↔
↔
↔
↔
↔
↔
H N Z V C
2
ORC #xx:8, CCR
B CCR∨#xx:8 → CCR
2
↔
↔
↔
↔
↔
↔
I
2
XORC #xx:8, CCR
B CCR⊕#xx:8 → CCR
2
↔
↔
↔
↔
↔
↔
@Rn
@(d:16, Rn)
@–Rn/@Rn+
@aa: 8/16
@(d:8, PC)
@@aa
Implied
Operation
#xx: 8/16
Rn
Mnemonic
Operand Size
Addressing Mode/
Instruction Length
No. of States
Table A.1
2
NOP
— PC ← PC+2
2 — — — — — — 2
EEPMOV
— if R4L≠0 then
Repeat @R5 → @R6
R5+1 → R5
R6+1 → R6
R4L–1 → R4L
Until R4L=0
else next
4 — — — — — — (4)
Notes:
2
2
2
2
— — — — — — 2
2
The number of states is the number of states required for execution when the instruction and its
operands are located in on-chip memory.
(1) Set to 1 when there is a carry or borrow from bit 11; otherwise cleared to 0.
(2) If the result is zero, the previous value of the flag is retained; otherwise the flag is cleared to 0.
(3) Set to 1 if decimal adjustment produces a carry; otherwise cleared to 0.
(4) The number of states required for execution is 4n+8 (n = value of R4L).
(5) These instructions are not supported by the H8/3318 Series.
(6) Set to 1 if the divisor is negative; otherwise cleared to 0.
(7) Set to 1 if the divisor is zero; otherwise cleared to 0.
458
10
↔
↔
↔
↔
↔
↔
↔
↔
↔
↔
↔
↔
— — — — — — 8
↔
↔
↔
↔
↔
↔
2
A.2
Operation Code Map
Table A.2 is a map of the operation codes contained in the first byte of the instruction code (bits
15 to 8 of the first instruction word).
Some pairs of instructions have identical first bytes. These instructions are differentiated by the
first bit of the second byte (bit 7 of the first instruction word).
Instruction when first bit of byte 2 (bit 7 of first instruction word) is 0.
Instruction when first bit of byte 2 (bit 7 of first instruction word) is 1.
459
460
8
XOR
AND
MOV
D
E
F
SUB
ADD
MOV
BVS
9
JMP
BPL
DEC
INC
A
EEPMOV
C
CMP
MOV
BLT
D
JSR
BGT
SUBX
ADDX
E
Bit manipulation instructions
BGE
MOV*1
BMI
SUBS
ADDS
B
Notes: 1. The MOVFPE and MOVTPE instructions are identical to MOV instructions in the first byte and first bit of the second byte (bits 15 to 7 of the instruction word).
The PUSH and POP instructions are identical in machine language to MOV instructions.
2. The BT, BF, BHS, and BLO instructions are identical in machine language to BRA, BRN, BCC, and BCS, respectively.
OR
C
BVC
SUBX
BILD
BIST
BLD
BST
BEQ
MOV
NEG
NOT
LDC
7
B
BIAND
BAND
RTE
BNE
AND
ANDC
6
CMP
BIXOR
BXOR
BSR
BCS*2
XOR
XORC
5
A
BIOR
BOR
RTS
BCC*2
OR
ORC
4
ADDX
BTS
BLS
ROTR
ROTXR
LDC
3
9
BCLR
BHI
ROTL
ROTXL
STC
2
ADD
BNOT
DIVXU
BRN*2
SHAR
SHLR
SLEEP
1
8
7
BSET
MULXU
5
6
BRA*2
SHAL
SHLL
NOP
0
4
3
2
1
0
Low
BLE
DAS
DAA
F
!
High
Table A.2
Operation Code Map
A.3
Number of States Required for Execution
The tables below can be used to calculate the number of states required for instruction execution.
Table A.3 indicates the number of states required for each cycle (instruction fetch, branch address
read, stack operation, byte data access, word data access, internal operation). Table A.4 indicates
the number of cycles of each type occurring in each instruction. The total number of states
required for execution of an instruction can be calculated from these two tables as follows:
Execution states = I × SI + J × SJ + K × SK + L × SL+ M × SM + N × SN
Examples: Mode 1 (on-chip ROM disabled), stack located in external memory, 1 wait state
inserted in external memory access.
1. BSET #0, @FFC7
From table A.4: I = L = 2, J = K = M = N= 0
From table A.3: SI = 8, SL = 3
Number of states required for execution: 2 × 8 + 2 × 3 =22
2. JSR @@30
From table A.4: I = 2, J = K = 1, L = M = N = 0
From table A.3: SI = SJ = SK = 8
Number of states required for execution: 2 × 8 + 1 × 8 + 1 × 8 = 32
Table A.3
Number of States Taken by Each Cycle in Instruction Execution
Access Location
Execution Status
(Instruction Cycle)
On-Chip Memory
On-Chip Reg. Field
External Memory
2
6
6 + 2m
Instruction fetch
SI
Branch address read
SJ
Stack operation
SK
Byte data access
SL
3
3+m
Word data access
SM
6
6 + 2m
Internal operation
SN
1
1
1
Note: m: Number of wait states inserted in access to external device.
461
Table A.4
Number of Cycles in Each Instruction
Instruction Mnemonic
Instruction Branch
Stack
Byte Data
Fetch
Addr. Read Operation Access
I
J
K
L
ADD
1
ADD.B #xx:8, Rd
ADD.B Rs, Rd
1
ADD.W Rs, Rd
1
ADDS
ADDS.W #1/2, Rd
1
ADDX
ADDX.B #xx:8, Rd
1
ADDX.B Rs, Rd
1
AND.B #xx:8, Rd
1
AND
AND.B Rs, Rd
1
ANDC
ANDC #xx:8, CCR
1
BAND
BAND #xx:3, Rd
1
Bcc
BCLR
BAND #xx:3, @Rd
2
1
BAND #xx:3, @aa:8
2
1
BRA d:8 (BT d:8)
2
BRN d:8 (BF d:8)
2
BHI d:8
2
BLS d:8
2
BCC d:8 (BHS d:8)
2
BCS d:8 (BLO d:8)
2
BNE d:8
2
BEQ d:8
2
BVC d:8
2
BVS d:8
2
BPL d:8
2
BMI d:8
2
BGE d:8
2
BLT d:8
2
BGT d:8
2
BLE d:8
2
BCLR #xx:3, Rd
1
BCLR #xx:3, @Rd
2
2
BCLR #xx:3, @aa:8
2
2
BCLR Rn, Rd
1
BCLR Rn, @Rd
2
2
BCLR Rn, @aa:8
2
2
Note: All values left blank are zero.
462
Word Data Internal
Access
Operation
M
N
Table A.4
Number of Cycles in Each Instruction (cont)
Instruction Mnemonic
Instruction Branch
Stack
Byte Data
Fetch
Addr. Read Operation Access
I
J
K
L
BIAND
BIAND #xx:3, Rd
1
BIAND #xx:3, @Rd
2
1
BIAND #xx:3, @aa:8 2
1
BILD
BIOR
BIST
BIXOR
BLD
BNOT
BOR
BSET
BILD #xx:3, Rd
Word Data Internal
Access
Operation
M
N
1
BILD #xx:3, @Rd
2
1
BILD #xx:3, @aa:8
2
1
BIOR #xx:3, Rd
1
BIOR #xx:3, @Rd
2
1
BIOR #xx:3, @aa:8
2
1
BIST #xx:3, Rd
1
BIST #xx:3, @Rd
2
2
BIST #xx:3, @aa:8
2
2
BIXOR #xx:3, Rd
1
BIXOR #xx:3, @Rd
2
1
BIXOR #xx:3, @aa:8 2
1
BLD #xx:3, Rd
1
BLD #xx:3, @Rd
2
1
BLD #xx:3, @aa:8
2
1
BNOT #xx:3, Rd
1
BNOT #xx:3, @Rd
2
2
BNOT #xx:3, @aa:8
2
2
BNOT Rn, Rd
1
BNOT Rn, @Rd
2
2
BNOT Rn, @aa:8
2
2
BOR #xx:3, Rd
1
BOR #xx:3, @Rd
2
1
BOR #xx:3, @aa:8
2
1
BSET #xx:3, Rd
1
BSET #xx:3, @Rd
2
2
BSET #xx:3, @aa:8
2
2
BSET Rn, Rd
1
BSET Rn, @Rd
2
2
BSET Rn, @aa:8
2
2
Note: All values left blank are zero.
463
Table A.4
Number of Cycles in Each Instruction (cont)
Instruction Mnemonic
Instruction Branch
Stack
Byte Data
Fetch
Addr. Read Operation Access
I
J
K
L
BSR
BSR d:8
2
BST
BST #xx:3, Rd
1
BST #xx:3, @Rd
2
2
BST #xx:3, @aa:8
2
2
BTST #xx:3, Rd
1
BTST #xx:3, @Rd
2
1
BTST #xx:3, @aa:8
2
1
BTST Rn, Rd
1
BTST
BXOR
CMP
1
BTST Rn, @Rd
2
1
BTST Rn, @aa:8
2
1
BXOR #xx:3, Rd
1
BXOR #xx:3, @Rd
2
1
BXOR #xx:3, @aa:8 2
1
CMP.B #xx:8, Rd
1
CMP.B Rs, Rd
1
CMP.W Rs, Rd
1
DAA
DAA.B Rd
1
DAS
DAS.B Rd
1
DEC
DEC.B Rd
1
DIVXU
DIVXU.B Rs, Rd
1
EEPMOV
EEPMOV
2
INC
INC.B Rd
1
JMP
JMP @Rn
2
JMP @aa:16
2
JMP @@aa:8
2
JSR @Rn
2
1
JSR @aa:16
2
1
JSR @@aa:8
2
LDC #xx:8, CCR
1
LDC Rs, CCR
1
MOV.B #xx:8, Rd
1
MOV.B Rs, Rd
1
JSR
LDC
MOV
Word Data Internal
Access
Operation
M
N
12
2n+2*
2
1
1
2
1
Notes: All values left blank are zero.
* n: Initial value in R4L. Source and destination are accessed n + 1 times each.
464
1
2
Table A.4
Number of Cycles in Each Instruction (cont)
Instruction Mnemonic
Instruction Branch
Stack
Byte Data
Fetch
Addr. Read Operation Access
I
J
K
L
MOV
MOV.B @Rs, Rd
1
1
MOV.B @(d:16,Rs),
Rd
2
1
MOV.B @Rs+, Rd
1
1
MOV.B @aa:8, Rd
1
1
MOV.B @aa:16, Rd
2
1
MOV.B Rs, @Rd
1
1
MOV.B Rs,
@(d:16, Rd)
2
1
MOV.B Rs, @–Rd
1
1
MOV.B Rs, @aa:8
1
1
MOV.B Rs, @aa:16
2
1
MOV.W #xx:16, Rd
2
MOV.W Rs, Rd
1
MOV.W @Rs, Rd
1
1
MOV.W @(d:16, Rs), 2
Rd
1
MOV.W @Rs+, Rd
2
2
1
1
MOV.W @aa:16, Rd 2
1
MOV.W Rs, @Rd
1
1
MOV.W Rs,
@(d:16, Rd)
2
1
MOV.W Rs, @–Rd
1
1
MOV.W Rs, @aa:16 2
1
MOVFPE
MOVFPE @aa:16,
Rd
Not supported
MOVTPE
MOVTPE.Rs,
@aa:16
Not supported
MULXU
MULXU.Rs, Rd
1
NEG
NEG.B Rd
1
NOP
NOP
1
NOT
NOT.B Rd
1
OR
OR.B #xx:8, Rd
1
OR.B Rs, Rd
1
ORC #xx:8, CCR
1
ORC
Word Data Internal
Access
Operation
M
N
2
2
12
Note: All values left blank are zero.
465
Table A.4
Number of Cycles in Each Instruction (cont)
Instruction Mnemonic
Instruction Branch
Stack
Byte Data
Fetch
Addr. Read Operation Access
I
J
K
L
POP
POP Rd
1
1
2
PUSH
PUSH Rd
1
1
2
ROTL
ROTL.B Rd
1
ROTR
ROTR.B Rd
1
ROTXL
ROTXL.B Rd
1
ROTXR
ROTXR.B Rd
1
RTE
RTE
2
2
2
RTS
RTS
2
1
2
SHAL
SHAL.B Rd
1
SHAR
SHAR.B Rd
1
SHLL
SHLL.B Rd
1
SHLR
SHLR.B Rd
1
SLEEP
SLEEP
1
STC
STC CCR, Rd
1
SUB
SUB.B Rs, Rd
1
SUB.W Rs, Rd
1
SUBS
SUBS.W #1/2, Rd
1
SUBX
SUBX.B #xx:8, Rd
1
SUBX.B Rs, Rd
1
XOR.B #xx:8, Rd
1
XOR.B Rs, Rd
1
XORC #xx:8, CCR
1
XOR
XORC
Note: All values left blank are zero.
466
Word Data Internal
Access
Operation
M
N
Appendix B Register Field
B.1
Register Addresses and Bit Names
Addr.
(Last Register
Byte) Name
Bit 7
Bit Names
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Module
H'80
External
H'81
addresses
H'82
(in expanded
H'83
modes)
H'84
H'85
H'86
H'87
H'88
SMR
H'89
BRR
C/A
CHR
PE
O/E
STOP
MP
CKS1
CKS0
H'8A
SCR
TIE
RIE
TE
RE
MPIE
TEIE
CKE1
CKE0
H'8B
TDR
H'8C
SSR
H'8D
RDR
TDRE
RDRF
ORER
FER
PER
TEND
MPB
MPBT
H'8E
—
—
—
—
—
—
—
—
—
H'8F
—
—
—
—
—
—
—
—
—
H'90
TIER
ICIAE
ICIBE
ICICE
ICIDE
OCIAE
OCIBE
OVIE
—
H'91
TCSR
ICFA
ICFB
ICFC
ICFD
OCFA
OCFB
OVF
CCLRA
H'92
FRCH
H'93
FRCL
H'94
SCI1
FRT0
OCRAH
OCRBH
H'95
OCRAL
OCRBL
H'96
TCR
IEDGA
IEDGB
IEDGC
IEDGD
BUFEA
BUFEB
CKS1
CKS0
H'97
TOCR
—
—
—
OCRS
OEA
OEB
OLVLA
OLVLB
H'98
ICRAH
H'99
ICRAL
Notes: FRT0: Free-running timer 0
SCI1: Serial communication interface 1
467
Addr.
(Last Register
Byte) Name
Bit 7
Bit Names
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Module
H'9A
ICRBH
FRT0
H'9B
ICRBL
H'9C
ICRCH
H'9D
ICRCL
H'9E
ICRDH
H'9F
ICRDL
H'A0
TCR
ICIE
OCIEB
OCIEA
OVIE
OEB
OEA
CKS1
CKS0
H'A1
TCSR
ICF
OCFB
OCFA
OVF
OLVLB
OLVLA
IEDG
CCLRA
H'A2
FRCH
H'A3
FRCL
H'A4
OCRAH
H'A5
OCRAL
H'A6
OCRBH
H'A7
OCRBL
H'A8
ICRH
H'A9
ICRL
H'AA
TCSR/
TCNT
H'AB
TCNT
H'AC
P1PCR
P17PCR P16PCR P15PCR P14PCR P13PCR P12PCR P11PCR P10PCR Port 1
H'AD
P2PCR
P27PCR P26PCR P25PCR P24PCR P23PCR P22PCR P21PCR P20PCR Port 2
H'AE
P3PCR
P37PCR P36PCR P35PCR P34PCR P33PCR P32PCR P31PCR P30PCR Port 3
H'AF
—
—
H'B0
P1DDR
P17DDR P16DDR P15DDR P14DDR P13DDR P12DDR P11DDR P10DDR Port 1
H'B1
P2DDR
P27DDR P26DDR P25DDR P24DDR P23DDR P22DDR P21DDR P20DDR Port 2
H'B2
P1DR
P17
P16
P15
P14
P13
P12
P11
P10
Port 1
H'B3
P2DR
P27
P26
P25
P24
P23
P22
P21
P20
Port 2
H'B4
P3DDR
P37DDR P36DDR P35DDR P34DDR P33DDR P32DDR P31DDR P30DDR Port 3
H'B5
P4DDR
P47DDR P46DDR P45DDR P44DDR P43DDR P42DDR P41DDR P40DDR Port 4
H'B6
P3DR
P37
P36
P35
P34
P33
P32
P31
P30
Port 3
H'B7
P4DR
P47
P46
P45
P44
P43
P42
P41
P40
Port 4
H'B8
P5DDR
—
—
—
—
—
P52DDR P51DDR P50DDR Port 5
WDT
—
Notes: FRT0: Free-running timer 0
FRT1: Free-running timer 1
WDT: Watchdog timer
468
FRT1
—
—
—
—
—
—
—
Addr.
(Last Register
Byte) Name
Bit 7
Bit Names
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Module
H'B9
P6DDR
P67DDR P66DDR P65DDR P64DDR P63DDR P62DDR P61DDR P60DDR Port 6
H'BA
P5DR
—
—
—
—
—
P52
P51
P50
Port 5
H'BB
P6DR
P67
P66
P65
P64
P63
P62
P61
P60
Port 6
H'BC
—
—
—
—
—
—
—
—
—
—
H'BD
P8DDR
—
P86DDR P85DDR P84DDR P83DDR P82DDR P81DDR P80DDR Port 8
H'BE
P7DR
P77
P76
P75
P74
P73
P72
P71
P70
Port 7
H'BF
P8DR
—
P86
P85
P84
P83
P82
P81
P80
Port 8
H'C0
P9DDR
P97DDR P96DDR P95DDR P94DDR P93DDR P92DDR P91DDR P90DDR Port 9
H'C1
P9DR
P97
P96
P95
P94
P93
P92
P91
P90
H'C2
WSCR
—
—
CKDBL
—
WMS1
WMS0
WC1
WC0
H'C3
STCR
RING
CMPF
CMPIE
LOAD
MARK
—
ICKS1
ICKS0
H'C4
SYSCR
SSBY
STS2
STS1
STS0
XRST
NMIEG
DPME
RAME
H'C5
MDCR
—
—
—
—
—
—
MDS1
MDS0
H'C6
ISCR
IRQ7SC IRQ6SC IRQ5SC IRQ4SC IRQ3SC IRQ2SC IRQ1SC IRQ0SC
H'C7
IER
IRQ7E
IRQ6E
IRQ5E
IRQ4E
IRQ3E
IRQ2E
IRQ1E
IRQ0E
H'C8
TCR
CMIEB
CMIEA
OVIE
CCLR1
CCLR0
CKS2
CKS1
CKS0
H'C9
TCSR
CMFB
CMFA
OVF
PWME
OS3
OS2
OS1
OS0
H'CA
TCORA
H'CB
TCORB
H'CC
TCNT
H'CD
NDER2
NDER15 NDER14 NDER13 NDER12 NDER11 NDER10 NDER9 NDER8 TPC
H'CE
NDRB*
NDR15
NDR14
NDR13
NDR12
NDR11
NDR10
NDR9
NDR8
NDR15
NDR14
NDR13
NDR12
—
—
—
—
NDR7
NDR6
NDR5
NDR4
NDR3
NDR2
NDR1
NDR0
NDR7
NDR6
NDR5
NDR4
—
—
—
—
H'CF
NDRA*
H'D0
TCR
CMIEB
CMIEA
OVIE
CCLR1
CCLR0
CKS2
CKS1
CKS0
H'D1
TCSR
CMFB
CMFA
OVF
PWME
OS3
OS2
OS1
OS0
H'D2
TCORA
H'D3
TCORB
H'D4
TCNT
System control
TMR0
TMR1
Notes: TMR0: 8-bit timer channel 0
TMR1: 8-bit timer channel 1
TPC:
Programmable timing pattern controller
* The address changes depending on the trigger setting
469
Addr.
(Last Register
Byte) Name
Bit 7
Bit Names
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Module
H'D5
NDER1
NDER7 NDER6 NDER5 NDER4 NDER3 NDER2 NDER1 NDER0 TPC
H'D6
NDRB*
—
—
—
—
—
—
—
—
—
—
—
—
NDR11
NDR10
NDR9
NDR8
—
—
—
—
—
—
—
—
—
—
—
—
NDR3
NDR2
NDR1
NDR0
C/A
CHR
PE
O/E
STOP
MP
CKS1
CKS0
TIE
RIE
TE
RE
MPIE
TEIE
CKE1
CKE0
TDRE
RDRF
ORER
FER
PER
TEND
MPB
MPBT
H'D7
NDRA*
H'D8
SMR
H'D9
BRR
H'DA
SCR
H'DB
TDR
H'DC
SSR
H'DD
RDR
H'DE
SCMR
—
—
—
—
SDIR
SINV
—
SMIF
H'DF
—
—
—
—
—
—
—
—
—
H'E0
ADDRAH AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
H'E1
ADDRAL AD1
AD0
—
—
—
—
—
—
H'E2
ADDRBH AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
H'E3
ADDRBL AD1
AD0
—
—
—
—
—
—
H'E4
ADDRCH AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
H'E5
ADDRCL AD1
AD0
—
—
—
—
—
—
H'E6
ADDRDH AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
H'E7
ADDRDL AD1
AD0
—
—
—
—
—
—
H'E8
ADCSR
ADF
ADIE
ADST
SCAN
CKS
CH2
CH1
CH0
H'E9
ADCR
TRGE
—
—
—
—
—
—
—
H'EA
TPMR
—
—
—
—
G3NOV G2NOV G1NOV G0NOV TPC
H'EB
TPCR
G3CMS1 G3CMS0 G2CMS1 G2CMS0 G1CMS1 G1CMS0 G0CMS1 G0CMS0
H'EC
—
—
—
—
—
—
—
—
—
H'ED
—
—
—
—
—
—
—
—
—
H'EE
—
—
—
—
—
—
—
—
—
H'EF
—
—
—
—
—
—
—
—
—
Notes: A/D:
Analog-to-Digital converter
SCI0: Serial communication interface 0
TPC: Programmable timing pattern controller
* The address changes depending on the trigger setting
470
SCI0
A/D
—
Addr.
(Last Register
Byte) Name
Bit 7
Bit 6
Bit 5
Bit 2
Bit 1
Bit 0
Module
H'F0
PCCSR
QREF
EWRQ
EWAKARERAKAR MWEF
MREF
EMWI
EMRI
DTU
H'F1
IOCR
HSCE
DPEA
DPEB
RPEA
RPEB
RPEC
—
—
H'F2
RLARA
H'F3
RLARB
H'F4
CPARB
H'F5
DTARH
H'F6
DTCRA
DTE
DTIE
BUD2
BUD1
BUD0
SOS2
SOS1
SOS0
H'F7
DTARA
H'F8
DTCRB
DTE
DTIE
BUD2
BUD1
BUD0
SOS2
SOS1
SOS0
H'F9
DTARB
H'FA
DTCRC
DTE
DTIE
BUD2
BUD1
BUD0
SOS2
SOS1
SOS0
H'FB
DTARC
H'FC
DPDRWH
H'FD
DPDRWL
H'FE
DPDRRH
H'FF
DPDRRL
Note:
Bit Names
Bit 4
Bit 3
DTU: Data transfer controller
471
B.2
Register Descriptions
Address onto which
register is mapped
Register name
Abbreviation
of register
name
TIER—Timer Interrupt Enable Register
Bit No.
Bit
Initial value
H'FF90
7
6
5
4
3
Initial value
ICIAE
0
ICIBE
0
ICICE
0
ICIDE
0
Read/Write
R/W
R/W
R/W
R/W
2
OCIAE OCIBE
0
0
R/W
R/W
FRT
1
0
OVIE
0
—
1
R/W
—
Name of
on-chip
supporting
module
Bit names
(abbreviations).
Bits marked “—”
are reserved.
Type of access permitted
R Read only
W Write only
R/W Read or write
Overflow Interrupt Enable
0 Overflow interrupt request is disabled.
1 Overflow interrupt request is enabled.
Output Compare Interrupt B Enable
0 Output compare interrupt request B is disabled.
1 Output compare interrupt request B is enabled.
Output Compare Interrupt A Enable
0 Output compare interrupt request A is disabled.
1 Output compare interrupt request A is enabled.
Input Capture Interrupt D Enable
0 Input capture interrupt request D is disabled.
1 Input capture interrupt request D is enabled.
472
Full name
of bit
Description
of bit function
SMR—Serial Mode Register
Bit
H'FF88
SCI1
7
6
5
4
3
2
1
0
C/A
CHR
PE
O/E
STOP
MP
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Select
0 0 ø clock
0 1 øP/4 clock
1 0 øP/16 clock
1 1 øP/64 clock
Multiprocessor Mode
0 Multiprocessor function disabled
1 Multiprocessor format selected
Stop Bit Length
0 One stop bit
1 Two stop bits
Parity Mode
0 Even parity
1 Odd parity
Parity Enable
0 Transmit: No parity bit added.
Receive: Parity bit not checked.
1 Transmit: Parity bit added.
Receive: Parity bit checked.
Character Length
0 8-bit data length
1 7-bit data length
Communication Mode
0 Asynchronous
1 Synchronous
473
BRR—Bit Rate Register
H'FF89
SCI1
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Constant that determines the bit rate
474
SCR—Serial Control Register
Bit
H'FF8A
SCI1
7
6
5
4
3
2
1
0
TIE
RIE
TE
RE
MPIE
TEIE
CKE1
CKE0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Enable 0
0 The SCK pin is not used by the SCI.
1 The SCK pin is used for serial clock output.
Clock Enable 1
0 Internal clock
1 External clock
Transmit End Interrupt Enable
0 TSR-empty interrupt request is disabled.
1 TSR-empty interrupt request is enabled.
Multiprocessor Interrupt Enable
0 Multiprocessor receive interrupt function is disabled.
1 Multiprocessor receive interrupt function is enabled.
Receive Enable
0 Receive disabled
1 Receive enabled
Transmit Enable
0 Transmit disabled
1 Transmit enabled
Receive Interrupt Enable
0 Receive interrupt and receive error interrupt requests are disabled.
1 Receive interrupt and receive error interrupt requests are enabled.
Transmit Interrupt Enable
0 TDR-empty interrupt request is disabled.
1 TDR-empty interrupt request is enabled.
475
TDR—Transmit Data Register
H'FF8B
SCI1
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Transmit data
476
SSR—Serial Status Register
Bit
H'FF8C
SCI1
7
6
5
4
3
2
1
0
TDRE
RDRF
ORER
FER
PER
TEND
MPB
MPBT
Initial value
1
0
0
0
0
1
0
0
Read/Write
R/(W) *
R
R
R/W
R/(W) *
R/(W) *
R/(W) *
R/(W) *
Multiprocessor Bit Transfer
0 Multiprocessor bit = 0 in transmit data.
1 Multiprocessor bit = 1 in transmit data.
Multiprocessor Bit
0 Multiprocessor bit = 0 in receive data.
1 Multiprocessor bit = 1 in receive data.
Transmit End
0 Cleared by reading TDRE = 1, then writing 0 in TDRE.
1 Set to 1 when TE = 0, or when TDRE = 1 at the end of
character transmission.
Parity Error
0 Cleared by reading PER = 1, then writing 0 in PER.
1 Set when a parity error occurs (parity of receive data
does not match parity selected by O/E bit in SMR).
Framing Error
0 Cleared by reading FER = 1, then writing 0 in FER.
1 Set when a framing error occurs (stop bit is 0).
Overrun Error
0 Cleared by reading ORER = 1, then writing 0 in ORER.
1 Set when an overrun error occurs (next data is completely
received while RDRF bit is set to 1).
Receive Data Register Full
0 Cleared by reading RDRF = 1, then writing 0 in RDRF.
Or when RDR is read in the DTU bus cycle.
1 Set when one character is received normally and transferred from RSR to RDR.
Transmit Data Register Empty
0 Cleared by reading TDRE = 1, then writing 0 in TDRE.
Or when a data is written to TDR in the DTU bus cycle.
1 Set when:
1. Data is transferred from TDR to TSR.
2. TE is cleared while TDRE = 0.
Note: * Software can write a 0 in bits 7 to 3 to clear the flags, but cannot write a 1 in these bits.
477
RDR—Receive Data Register
H'FF8D
SCI1
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Receive data
478
TIER—Timer Interrupt Enable Register
Bit
H'FF90
FRT0
7
6
5
4
3
2
1
0
ICIAE
ICIBE
ICICE
ICIDE
OCIAE
OCIBE
OVIE
—
Initial value
0
0
0
0
0
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
—
Overflow Interrupt Enable
0 Overflow interrupt request is disabled.
1 Overflow interrupt request is enabled.
Output Compare Interrupt B Enable
0 Output compare interrupt request B is disabled.
1 Output compare interrupt request B is enabled.
Output Compare Interrupt A Enable
0 Output compare interrupt request A is disabled.
1 Output compare interrupt request A is enabled.
Input Capture Interrupt D Enable
0 Input capture interrupt request D is disabled.
1 Input capture interrupt request D is enabled.
Input Capture Interrupt C Enable
0 Input capture interrupt request C is disabled.
1 Input capture interrupt request C is enabled.
Input Capture Interrupt B Enable
0 Input capture interrupt request B is disabled.
1 Input capture interrupt request B is enabled.
Input Capture Interrupt A Enable
0 Input capture interrupt request A is disabled.
1 Input capture interrupt request A is enabled.
479
TCSR—Timer Control/Status Register
Bit
H'FF91
FRT0
7
6
5
4
3
2
1
0
ICFA
ICFB
ICFC
ICFD
OCFA
OCFB
OVF
CCLRA
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W) *
R/(W) *
R/(W) *
R/(W) *
R/(W) *
R/(W) *
R/(W) *
R/W
Counter Clear A
0 FRC count is not cleared.
1 FRC count is cleared by compare-match A.
Timer Overflow Flag
0 Cleared by reading OVF = 1, then writing 0 in OVF.
1 Set when FRC changes from H'FFFF to H'0000.
Output Compare Flag B
0 Cleared by reading OCFB = 1, then writing 0 in OCFB.
1 Set when FRC = OCRB.
Output Compare Flag A
0 Cleared by reading OCFA = 1, then writing 0 in OCFA.
1 Set when FRC = OCRA.
Input Capture Flag D
0 Cleared by reading ICFD = 1, then writing 0 in ICFD.
1 Set by FTID input.
Input Capture Flag C
0 Cleared by reading ICFC = 1, then writing 0 in ICFC.
1 Set by FTIC input.
Input Capture Flag B
0 Cleared by reading ICFB = 1, then writing 0 in ICFB.
1 Set when FTIB input causes FRC to be copied to ICRB.
Input Capture Flag A
0 Cleared by reading ICFA = 1, then writing 0 in ICFA.
1 Set when FTIA input causes FRC to be copied to ICRA.
Note: * Software can write a 0 in bits 7 to 1 to clear the flags, but cannot write a 1 in these bits.
480
FRC (H and L)—Free-Running Counter
H'FF92, H'FF93
FRT0
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Count value
OCRA (H and L)—Output Compare Register A
H'FF94, H'FF95
FRT0
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Continually compared with FRC. OCFA is set to 1 when OCRA = FRC.
OCRB (H and L)—Output Compare Register B
Bit
7
6
5
H'FF94, H'FF95
4
3
2
FRT0
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Continually compared with FRC. OCFB is set to 1 when OCRB = FRC.
481
TCR—Timer Control Register
Bit
H'FF96
FRT0
7
6
5
4
3
2
1
0
IEDGA
IEDGB
IEDGC
IEDGD
BUFEA
BUFEB
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Select
0 0 Internal clock source: øP/2
0 1 Internal clock source: øP/8
1 0 Internal clock source: øP/32
1 1 External clock source: counted on rising edge
Buffer Enable B
0 ICRD is used for input capture D.
1 ICRD is buffer register for input capture B.
Buffer Enable A
0 ICRC is used for input capture C.
1 ICRC is buffer register for input capture A.
Input Edge Select D
0 Falling edge of FTID is valid.
1 Rising edge of FTID is valid.
Input Edge Select C
0 Falling edge of FTIC is valid.
1 Rising edge of FTIC is valid.
Input Edge Select B
0 Falling edge of FTIB is valid.
1 Rising edge of FTIB is valid.
Input Edge Select A
0 Falling edge of FTIA is valid.
1 Rising edge of FTIA is valid.
482
TOCR—Timer Output Compare Control Register
Bit
H'FF97
FRT0
7
6
5
4
3
2
1
0
—
—
—
OCRS
OEA
OEB
OLVLA
OLVLB
Initial value
1
1
1
0
0
0
0
0
Read/Write
—
—
—
R/W
R/W
R/W
R/W
R/W
Output Level B
0 Compare-match B causes 0 output.
1 Compare-match B causes 1 output.
Output Level A
0 Compare-match A causes 0 output.
1 Compare-match A causes 1 output.
Output Enable B
0 Output compare B output is disabled.
1 Output compare B output is enabled.
Output Enable A
0 Output compare A output is disabled.
1 Output compare A output is enabled.
Output Compare Register Select
0 The CPU can access OCRA.
1 The CPU can access OCRB.
483
ICRA (H and L)—Input Capture Register A
H'FF98, H'FF99
FRT0
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Contains FRC count captured on FTIA input.
ICRB (H and L)—Input Capture Register B
H'FF9A, H'FF9B
FRT0
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Contains FRC count captured on FTIB input.
ICRC (H and L)—Input Capture Register C
Bit
7
6
5
H'FF9C, H'FF9D
4
3
2
FRT0
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Contains FRC count captured on FTIC input, or old ICRA value in buffer mode.
ICRD (H and L)—Input Capture Register D
H'FF9E, H'FF9F
FRT0
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Contains FRC count captured on FTID input, or old ICRB value in buffer mode.
484
TCR—Timer Control Register
Bit
H'FFA0
FRT1
7
6
5
4
3
2
1
0
ICIE
OCIEB
OCIEA
OVIE
OEB
OEA
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Select
0 0 Internal clock source: øP/2
0 1 Internal clock source: øP/8
1 0 Internal clock source: øP/32
1 1 External clock source: counted on rising edge
Output Enable A
0 Output compare A output is disabled.
1 Output compare A output is enabled.
Output Enable B
0 Output compare B output is disabled.
1 Output compare B output is enabled.
Timer Overflow Interrupt Enable
0 Overflow interrupt request is disabled.
1 Overflow interrupt request is enabled.
Output Compare Interrupt Enable A
0 Output compare interrupt request A is disabled.
1 Output compare interrupt request A is enabled.
Output Compare Interrupt Enable B
0 Output compare interrupt request B is disabled.
1 Output compare interrupt request B is enabled.
Input Capture Interrupt Enable
0 Input capture interrupt request is disabled.
1 Input capture interrupt request is enabled.
485
TCSR—Timer Control Status Register
Bit
H'FFA1
FRT1
7
6
5
4
3
2
1
0
ICF
OCFB
OCFA
OVF
OLVLB
OLVLA
IEDG
CCLRA
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W) *
R/(W) *
R/(W) *
R/W
R/W
R/W
R/W
R/(W) *
Counter Clear A
0 FRC count is not cleared.
1 FRC count is cleared by compare-match A.
Input Edge Select
0 FRC value is transferred to ICR at falling edge of FTI
1 FRC value is transferred to ICR at rising edge of FTI
Output Level A
0 Compare-match A causes 0 output
1 Compare-match A causes 1 output
Output Level B
0 Compare-match B causes 0 output
1 Compare-match B causes 1 output
Timer Overflow Flag
0 Cleared by reading OVF = 1, then writing 0 in OVF
1 Set when FRC changes from H'FFFF to H'0000
Output Compare Flag A
0 Cleared by reading OCFA = 1, then writing 0 in OCFA
1 Set when FRC = OCRA
Output Compare Flag B
0 Cleared by reading OCFB = 1, then writing 0 in OCFB
1 Set when FRC = OCRB
Input Capture Flag
0 Cleared by reading ICF = 1, then writing 0 in ICF
1 Set when FRC value is copied to ICR by input capture signal
Note: * Software can write a 0 to clear the flags, but cannot write a 1 in these bits.
486
FRC (H and L)—Free Running Counter
H'FFA2, FFA3
FRT1
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Count value
OCRA (H and L)—Output Compare Register A
H'FFA4, FFA5
FRT1
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Continually compared with FRC. OCFA is set to 1 when OCRA = FRC.
OCRB (H and L)—Output Compare Register B
Bit
7
6
5
H'FFA6, FFA7
4
3
2
FRT1
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Continually compared with FRC. OCFB is set to 1 when OCRB = FRC.
ICR (H and L)—Input Capture Register
H'FFA8, FFA9
FRT1
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Contains FRC count captured by internal input capture
signal generated from external input signal transition
487
H'FFAA*1, H'FFAB*2
TCSR—Timer Control/Status Register
Bit
Initial value
Read/Write
WDT
7
6
5
4
3
2
1
0
OVF
WT/IT
TME
—
RST/NMI
CKS2
CKS1
CKS0
0
0
0
1
0
0
0
0
R/W
R/W
—
R/W
R/W
R/W
R/W
R/(W)*3
Clock Select
0 0 0 øP/2
0 0 1 øP/32
0 1 0 øP/64
0 1 1 øP/128
1 0 0 øP/256
1 0 1 øP/512
1 1 0 øP/2048
1 1 1 øP/4096
Reset or NMI Select
0 NMI function enabled
1 Reset function enabled
Timer Enable
0 Timer disabled: TCNT is initialized to H'00 and stopped
1 Timer enabled: TCNT runs; CPU interrupts can be requested
Timer Mode Select
0 Interval timer mode (OVF interrupt request)
1 Watchdog timer mode (reset or NMI request)
Overflow flag
0 Cleared by reading OVF = 1, then writing 1 in OVF
1 Set when TCNT changes from H'FF to H'00
Notes: 1. Read access address.
2. Write address, but write access requires word transfer to H'FFAA.
3. Only 0 can be written, to clear the flag.
488
TCNT—Timer Counter
H'FFAB*
WDT
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Count value
Note: * Write access requires word transfer to H'FFAA.
P1PCR—Port 1 Input Pull-Up Control Register
Bit
7
6
5
H'FFAC
4
3
Port 1
2
1
0
P17PCR P16PCR P15PCR P14PCR P13PCR P12PCR P11PCR P10PCR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Port 1 Input Pull-Up Control
0 Input pull-up transistor is off.
1 Input pull-up transistor is on.
P2PCR—Port 2 Input Pull-Up Control Register
Bit
7
6
5
H'FFAD
4
3
Port 2
2
1
0
P27PCR P26PCR P25PCR P24PCR P23PCR P22PCR P21PCR P20PCR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Port 2 Input Pull-Up Control
0 Input pull-up transistor is off.
1 Input pull-up transistor is on.
489
P3PCR—Port 3 Input Pull-Up Control Register
Bit
7
6
5
H'FFAE
4
3
Port 3
2
1
0
P37PCR P36PCR P35PCR P34PCR P33PCR P32PCR P31PCR P30PCR
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Port 3 Input Pull-Up Control
0 Input pull-up transistor is off.
1 Input pull-up transistor is on.
P1DDR—Port 1 Data Direction Register
Bit
6
7
H'FFB0
5
4
3
Port 1
2
1
0
P17DDR P16DDR P15DDR P14DDR P13DDR P12DDR P11DDR P10DDR
Mode 1
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Modes 2 and 3
Port 1 Input/Output Control
0 Input port
1 Output port
P1DR—Port 1 Data Register
Bit
H'FFB2
Port 1
7
6
5
4
3
2
1
0
P17
P16
P15
P14
P13
P12
P11
P10
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
490
P2DDR—Port 2 Data Direction Register
Bit
6
7
H'FFB1
5
4
3
Port 2
2
1
0
P27DDR P26DDR P25DDR P24DDR P23DDR P22DDR P21DDR P20DDR
Mode 1
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Modes 2 and 3
Port 2 Input/Output Control
0 Input port
1 Output port
P2DR—Port 2 Data Register
Bit
H'FFB3
Port 2
7
6
5
4
3
2
1
0
P27
P26
P25
P24
P23
P22
P21
P20
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P3DDR—Port 3 Data Direction Register
Bit
7
6
5
H'FFB4
4
3
Port 3
2
1
0
P37DDR P36DDR P35DDR P34DDR P33DDR P32DDR P31DDR P30DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Port 3 Input/Output Control
0 Input port
1 Output port
491
P3DR—Port 3 Data Register
Bit
H'FFB6
Port 3
7
6
5
4
3
2
1
0
P37
P36
P35
P34
P33
P32
P31
P30
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P4DDR—Port 4 Data Direction Register
Bit
7
6
H'FFB5
5
4
3
Port 4
2
1
0
P47DDR P46DDR P45DDR P44DDR P43DDR P42DDR P41DDR P40DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Port 4 Input/Output Control
0 Input port
1 Output port
P4DR—Port 4 Data Register
Bit
H'FFB7
Port 4
7
6
5
4
3
2
1
0
P47
P46
P45
P44
P43
P42
P41
P40
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P5DDR—Port 5 Data Direction Register
Bit
H'FFB8
Port 5
7
6
5
4
3
—
—
—
—
—
Initial value
1
1
1
1
1
0
0
0
Read/Write
—
—
—
—
—
W
W
W
2
1
0
P52DDR P51DDR P50DDR
Port 5 Input/Output Control
0 Input port
1 Output port
492
P5DR—Port 5 Data Register
Bit
H'FFBA
Port 5
7
6
5
4
3
2
1
0
—
—
—
—
—
P52
P51
P50
Initial value
1
1
1
1
1
0
0
0
Read/Write
—
—
—
—
—
R/W
R/W
R/W
P6DDR—Port 6 Data Direction Register
Bit
7
6
5
H'FFB9
4
Port 6
3
2
1
0
P67DDR P66DDR P65DDR P64DDR P63DDR P62DDR P61DDR P60DDR
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Port 6 Input/Output Control
0 Input port
1 Output port
P6DR—Port 6 Data Register
Bit
H'FFBB
Port 6
7
6
5
4
3
2
1
0
P67
P66
P65
P64
P63
P62
P61
P60
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P7DR—Port 7 Data Register
Bit
H'FFBE
Port 7
7
6
5
4
3
2
1
0
P77
P76
P75
P74
P73
P72
P71
P70
Initial value
*
*
*
*
*
*
*
*
Read/Write
R
R
R
R
R
R
R
R
Note: * Depends on the levels of pins P77 to P70.
493
P8DDR—Port 8 Data Direction Register
Bit
7
—
6
5
H'FFBD
4
Port 8
3
2
1
0
P86DDR P85DDR P84DDR P83DDR P82DDR P81DDR P80DDR
Initial value
1
0
0
0
0
0
0
0
Read/Write
—
W
W
W
W
W
W
W
Port 8 Input/Output Control
0 Input port
1 Output port
P8DR—Port 8 Data Register
Bit
H'FFBF
Port 8
7
6
5
4
3
2
1
0
—
P86
P85
P84
P83
P82
P81
P80
Initial value
1
0
0
0
0
0
0
0
Read/Write
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P9DDR—Port 9 Data Direction Register
Bit
7
6
5
H'FFC0
4
Port 9
3
2
1
0
P97DDR P96DDR P95DDR P94DDR P93DDR P92DDR P91DDR P90DDR
Modes 1 and 2
Initial value
0
1
0
0
0
0
0
0
Read/Write
W
—
W
W
W
W
W
W
Initial value
0
0
0
0
0
0
0
0
Read/Write
W
W
W
W
W
W
W
W
Mode 3
Port 9 Input/Output Control
0 Input port
1 Output port
494
P9DR—Port 9 Data Register
Bit
H'FFC1
Port 9
7
6
5
4
3
2
1
0
P97
P96
P95
P94
P93
P92
P91
P90
Initial value
0
*
0
0
0
0
0
0
Read/Write
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
Note: * Depends on the level of pin P96.
WSCR—Wait-State Control Register
Bit
H'FFC2
7
6
5
4
3
2
1
0
—
—
CKDBL
—
WMS1
WMS0
WC1
WC0
Initial value
1
1
0
1
0
0
0
0
Read/Write
—
—
R/W
—
R/W
R/W
R/W
R/W
Wait Count
0 0 No wait states inserted by wait-state
controller
0 1 1 state inserted
1 0 2 states inserted
1 1 3 states inserted
Wait Mode Select
0 0 Programmable wait mode
0 1 No wait states inserted by wait-state
controller
1 0 Pin wait mode
1 1 Pin auto-wait mode
Clock Double
0 Clock for supporting modules is not divided (øP = ø)
1 Clock for supporting modules is divided by 2 (øP = ø/2)
495
STCR—Serial/Timer Control Register
Bit
H'FFC3
TMR0/1
7
6
5
4
3
2
1
0
RING
CMPF
CMPIE
LOAD
MARK
—
ICKS1
ICKS0
Initial value
0
0
0
1
1
1
0
0
Read/Write
R/W
R/(W)*
R/W
(W)
(W)
—
R/W
R/W
Internal Clock Source Select
See TCR under TMR0 and TMR1.
Pointer Mark
0 DTARB contents are copied to RLARB
1 No operation
Pointer Load
0 RLARB contents are copied to DTARB
1 No operation
Compare Interrupt Enable
0 Interrupt request (CMPI) by CMPF is disabled
1 Interrupt request (CMPI) by CMPF is enabled
Compare Interrupt Flag
0 Cleared by reading CMPF = 1, then writing 0 in CMPF
1 Ring buffer overrun error
Set when DTARB contents match CPARB contents
after being incremented by DTU cycle occurrence
Ring Buffer Mode
0 DTU channel B does not operate in ring buffer mode
1 DTU channel B operates in ring buffer mode
Note: * Software can write a 0 in bit 6 to clear the flag, but cannot write a 1 in this bit.
496
SYSCR—System Control Register
Bit
H'FFC4
7
6
5
4
3
2
1
0
SSBY
STS2
STS1
STS0
XRST
NMIEG
DPME
RAME
Initial value
0
0
0
0
1
0
0
1
Read/Write
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
RAM Enable
0 On-chip RAM is disabled.
1 On-chip RAM is enabled.
Dual-Port RAM Mode Enable
0 Not being set to slave mode.
1 Being set to slave mode.
NMI Edge
0 Falling edge of NMI is detected.
1 Rising edge of NMI is detected.
External Reset
0 The chip is reset by a watchdog timer overflow.
1 The chip is reset by an external reset signal.
Standby Timer Select
0 0 0 Clock settling time = 8,192 states
0 0 1 Clock settling time = 16,384 states
0 1 0 Clock settling time = 32,768 states
0 1 1 Clock settling time = 65,536 states
1 0 — Clock settling time = 131,072 states
1 1 — Prohibited
Software Standby
0 SLEEP instruction causes transition to sleep mode.
1 SLEEP instruction causes transition to software standby mode.
497
MDCR—Mode Control Register
Bit
H'FFC5
7
6
5
4
3
2
1
0
—
—
—
—
—
—
MDS1
MDS0
Initial value
1
1
1
0
0
1
*
*
Read/Write
—
—
—
—
—
—
R
R
Mode Select Bits
Value at mode pins.
Note: * Determined by inputs at pins MD1 and MD0.
ISCR—IRQ Sense Control Register
Bit
7
6
H'FFC6
5
4
3
2
1
0
IRQ7SC IRQ6SC IRQ5SC IRQ4SC IRQ3SC IRQ2SC IRQ1SC IRQ0SC
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
IRQ0 to IRQ7 Sense Control
0 IRQ0 to IRQ7 are level-sensed (active low).
1 IRQ0 to IRQ7 are edge-sensed (falling edge).
IER—IRQ Enable Register
Bit
H'FFC7
7
6
5
4
3
2
1
0
IRQ7E
IRQ6E
IRQ5E
IRQ4E
IRQ3E
IRQ2E
IRQ1E
IRQ0E
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
IRQ0 to IRQ7 Enable
0 IRQ0 to IRQ7 are disabled.
1 IRQ0 to IRQ7 are enabled.
498
TCR—Timer Control Register
Bit
H'FFC8
TMR0
7
6
5
4
3
2
1
0
CMIEB
CMIEA
OVIE
CCLR1
CCLR0
CKS2
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Select
TCR
STCR
Description
CKS2 CKS1 CKS0 ICKS1 ICKS0
0
0
0
—
—
Timer stopped
0
0
1
—
0
øP/8 internal clock, falling edge
0
0
1
—
1
øP/2 internal clock, falling edge
0
1
0
—
0
øP/64 internal clock, falling edge
0
1
0
—
1
øP/32 internal clock, falling edge
0
1
1
—
0
øP/1024 internal clock, falling edge
0
1
1
—
1
øP/256 internal clock, falling edge
1
0
0
—
—
Timer stopped
1
0
1
—
—
External clock, rising edge
1
1
0
—
—
External clock, falling edge
1
1
1
—
—
External clock, rising and falling edges
Counter Clear
0 0 Counter is not cleared.
0 1 Cleared by compare-match A.
1 0 Cleared by compare-match B.
1 1 Cleared on rising edge of external reset input.
Timer Overflow Interrupt Enable
0 Overflow interrupt request is disabled.
1 Overflow interrupt request is enabled.
Compare-Match Interrupt Enable A
0 Compare-match A interrupt request is disabled.
1 Compare-match A interrupt request is enabled.
Compare-Match Interrupt Enable B
0 Compare-match B interrupt request is disabled.
1 Compare-match B interrupt request is enabled.
499
TCSR—Timer Control/Status Register
Bit
Initial value
Read/Write
H'FFC9
TMR0
7
6
5
4
CMFB
CMFA
OVF
PWME
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/(W) *1
R/(W)*1
R/(W)*1
3
OS3 *2
2
OS2 *2
1
OS1*2
0
OS0*2
Output Select
0 0 No change on compare-match A.
0 1 Output 0 on compare-match A.
1 0 Output 1 on compare-match A.
1 1 Invert (toggle) output on compare-match A.
Output Select
0 0 No change on compare-match B.
0 1 Output 0 on compare-match B.
1 0 Output 1 on compare-match B.
1 1 Invert (toggle) output on compare-match B.
PWM Mode Enable
0 Normal timer mode
1 PWM mode
Timer Overflow Flag
0 Cleared by reading OVF = 1, then writing 0 in OVF.
1 Set when TCNT changes from H'FF to H'00.
Compare-Match Flag A
0 Cleared by reading CMFA = 1, then writing 0 in CMFA.
1 Set when TCNT = TCORA.
Compare-Match Flag B
0 Cleared by reading CMFB = 1, then writing 0 in CMFB.
1 Set when TCNT = TCORB.
Notes: 1. Software can write a 0 in bits 7 to 5 to clear the flags, but cannot write a 1 in these bits.
2. When all four bits (OS3 to OS0) are cleared to 0, output is disabled.
500
TCORA—Time Constant Register A
H'FFCA
TMR0
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The CMFA bit is set to 1 when TCORA = TCNT.
TCORB—Time Constant Register B
H'FFCB
TMR0
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The CMFB bit is set to 1 when TCORB = TCNT.
TCNT—Timer Counter
Bit
7
H'FFCC
6
5
4
3
TMR0
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Count value
501
NDER2—Next Data Enable Register 2
Bit
7
6
H'FFCD
5
4
3
TPC
2
1
0
NDER15 NDER14 NDER13 NDER12 NDER11 NDER10 NDER9 NDER8
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Next Data Enable 15 to 8
Bits 7 to 0
NDER15 to 8
502
Description
0
TPC outputs TP15 to TP8 are disabled
(NDR15 to NDR8 cannot be transferred to P27 to P20)
1
TPC outputs TP15 to TP8 are enabled
(NDR15 to NDR8 can be transferred to P27 to P20)
NDRB—Next Data Register B
H'FFCE/H'FFD6
TPC
• Same Trigger for TPC Output Groups 2 and 3
Address H'FFCE
Bit
7
6
5
4
3
2
1
0
NDR15
NDR14
NDR13
NDR12
NDR11
NDR10
NDR9
NDR8
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Next output data for
TPC output group 3
Next output data for
TPC output group 2
Address H'FFD6
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
—
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
• Different Triggers for TPC Output Groups 2 and 3
Address H'FFCE
Bit
7
6
5
4
3
2
1
0
NDR15
NDR14
NDR13
NDR12
—
—
—
—
Initial value
0
0
0
0
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
—
—
—
—
Next output data for
TPC output group 3
Address H'FFD6
Bit
7
6
5
4
3
2
1
0
—
—
—
—
NDR11
NDR10
NDR9
NDR8
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
R/W
R/W
R/W
R/W
Next output data for
TPC output group 2
503
NDRA—Next Data Register A
H'FFCF/H'FFD7
TPC
• Same Trigger for TPC Output Groups 0 and 1
Address H'FFCF
Bit
7
6
5
4
3
2
1
0
NDR7
NDR6
NDR5
NDR4
NDR3
NDR2
NDR1
NDR0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Next output data for
TPC output group 1
Next output data for
TPC output group 0
Address H'FFD7
Bit
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
—
Initial value
1
1
1
1
1
1
1
1
Read/Write
—
—
—
—
—
—
—
—
• Different Triggers for TPC Output Groups 0 and 1
Address H'FFCF
Bit
7
6
5
4
3
2
1
0
NDR7
NDR6
NDR5
NDR4
—
—
—
—
Initial value
0
0
0
0
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
—
—
—
—
Next output data for
TPC output group 1
Address H'FFD7
Bit
7
6
5
4
3
2
1
0
—
—
—
—
NDR3
NDR2
NDR1
NDR0
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
R/W
R/W
R/W
R/W
Next output data for
TPC output group 0
504
TCR—Timer Control Register
Bit
H'FFD0
TMR1
7
6
5
4
3
2
1
0
CMIEB
CMIEA
OVIE
CCLR1
CCLR0
CKS2
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Select
TCR
STCR
Description
CKS2 CKS1 CKS0 ICKS1 ICKS0
0
0
0
—
—
Timer stopped
0
0
1
0
—
øP/8 internal clock, falling edge
0
0
1
1
—
øP/2 internal clock, falling edge
0
1
0
0
—
øP/64 internal clock, falling edge
0
1
0
1
—
øP/128 internal clock, falling edge
0
1
1
0
—
øP/1024 internal clock, falling edge
0
1
1
1
—
øP/2048 internal clock, falling edge
1
0
0
—
—
Timer stopped
1
0
1
—
—
External clock, rising edge
1
1
0
—
—
External clock, falling edge
1
1
1
—
—
External clock, rising and falling edges
Counter Clear
0 0 Counter is not cleared.
0 1 Cleared by compare-match A.
1 0 Cleared by compare-match B.
1 1 Cleared on rising edge of external reset input.
Timer Overflow Interrupt Enable
0 Overflow interrupt request is disabled.
1 Overflow interrupt request is enabled.
Compare-Match Interrupt Enable A
0 Compare-match A interrupt request is disabled.
1 Compare-match A interrupt request is enabled.
Compare-Match Interrupt Enable B
0 Compare-match B interrupt request is disabled.
1 Compare-match B interrupt request is enabled.
505
TCSR—Timer Control/Status Register
Bit
Initial value
Read/Write
H'FFD1
TMR1
7
6
5
4
CMFB
CMFA
OVF
PWME
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/(W) *1
R/(W) *1
R/(W) *1
3
2
OS3*2
0
1
OS2 *2
OS1*2
OS0*2
Notes: Bit functions are the same as for TMR0.
1. Software can write a 0 in bits 7 to 5 to clear the flags, but cannot write a 1 in these bits.
2. When all four bits (OS3 to OS0) are cleared to 0, output is disabled.
TCORA—Time Constant Register A
H'FFD2
TMR1
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note: Bit functions are the same as for TMR0.
TCORB—Time Constant Register B
H'FFD3
TMR1
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note: Bit functions are the same as for TMR0.
TCNT—Timer Counter
H'FFD4
TMR1
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Note: Bit functions are the same as for TMR0.
506
NDER1—Next Data Enable Register 1
Bit
7
6
NDER7
H'FFD5
5
NDER6 NDER5
4
TPC
3
NDER4 NDER3
2
NDER2
1
0
NDER1 NDER0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Next Data Enable 7 to 0
Bits 7 to 0
NDER7 to 0
Description
0
TPC outputs TP7 to TP0 are disabled
(NDR7 to NDR0 cannot be transferred to P17 to P10)
1
TPC outputs TP7 to TP0 are enabled
(NDR7 to NDR0 can be transferred to P17 to P10)
507
SMR—Serial Mode Register
Bit
H'FFD8
SCI0
7
6
5
4
3
2
1
0
C/A
CHR
PE
O/E
STOP
MP
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Select
0 0 ø clock
0 1 øP/4 clock
1 0 øP/16 clock
1 1 øP/64 clock
Multiprocessor Mode
0 Multiprocessor function disabled
1 Multiprocessor format selected
Stop Bit Length
0 One stop bit
1 Two stop bits
Parity Mode
0 Even parity
1 Odd parity
Parity Enable
0 Transmit: No parity bit added.
Receive: Parity bit not checked.
1 Transmit: Parity bit added.
Receive: Parity bit checked.
Character Length
0 8-bit data length
1 7-bit data length
Communication Mode
0 Asynchronous
1 Synchronous
Note: Bit functions are the same as for SCI1.
508
BRR—Bit Rate Register
H'FFD9
SCI0
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Constant that determines the bit rate
Note: Bit functions are the same as for SCI1.
509
SCR—Serial Control Register
Bit
H'FFDA
SCI0
7
6
5
4
3
2
1
0
TIE
RIE
TE
RE
MPIE
TEIE
CKE1
CKE0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Clock Enable 0
0 The SCK pin is not used by the SCI.
1 The SCK pin is used for serial clock output.
Clock Enable 1
0 Internal clock
1 External clock
Transmit End Interrupt Enable
0 TSR-empty interrupt request is disabled.
1 TSR-empty interrupt request is enabled.
Multiprocessor Interrupt Enable
0 Multiprocessor receive interrupt function is disabled.
1 Multiprocessor receive interrupt function is enabled.
Receive Enable
0 Receive disabled
1 Receive enabled
Transmit Enable
0 Transmit disabled
1 Transmit enabled
Receive Interrupt Enable
0 Receive interrupt and receive error interrupt requests are disabled.
1 Receive interrupt and receive error interrupt requests are enabled.
Transmit Interrupt Enable
0 TDR-empty interrupt request is disabled.
1 TDR-empty interrupt request is enabled.
Note: Bit functions are the same as for SCI1.
510
TDR—Transmit Data Register
H'FFDB
SCI0
Bit
7
6
5
4
3
2
1
0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Transmit data
Note: Bit functions are the same as for SCI1.
511
SSR—Serial Status Register
Bit
H'FFDC
SCI0
7
6
5
4
3
2
1
0
TDRE
RDRF
ORER
FER
PER
TEND
MPB
MPBT
Initial value
1
0
0
0
0
1
0
0
Read/Write
R/(W) *
R
R
R/W
R/(W) *
R/(W) *
R/(W) *
R/(W) *
Multiprocessor Bit Transfer
0 Multiprocessor bit = 0 in transmit data.
1 Multiprocessor bit = 1 in transmit data.
Multiprocessor Bit
0 Multiprocessor bit = 0 in receive data.
1 Multiprocessor bit = 1 in receive data.
Transmit End
0 Cleared by reading TDRE = 1, then writing 0 in TDRE.
1 Set to 1 when TE = 0, or when TDRE = 1 at the end of
character transmission.
Parity Error
0 Cleared by reading PER = 1, then writing 0 in PER.
1 Set when a parity error occurs (parity of receive data
does not match parity selected by O/E bit in SMR).
Framing Error
0 Cleared by reading FER = 1, then writing 0 in FER.
1 Set when a framing error occurs (stop bit is 0).
Overrun Error
0 Cleared by reading ORER = 1, then writing 0 in ORER.
1 Set when an overrun error occurs (next data is completely
received while RDRF bit is set to 1).
Receive Data Register Full
0 Cleared by reading RDRF = 1, then writing 0 in RDRF.
1 Set when one character is received normally and transferred from RSR to RDR.
Transmit Data Register Empty
0 Cleared by reading TDRE = 1, then writing 0 in TDRE.
1 Set when:
1. Data is transferred from TDR to TSR.
2. TE is cleared while TDRE = 0.
Note: * Software can write a 0 in bits 7 to 3 to clear the flags, but cannot write a 1 in these bits.
Bit functions are the same as for SCI1.
512
RDR—Receive Data Register
H'FFDD
SCI0
Bit
7
6
5
4
3
2
1
0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
Receive data
Note: Bit functions are the same as for SCI1.
SCMR—Serial Communication Mode Register
Bit
H'FFDE
SCI0
7
6
5
4
3
2
1
0
—
—
—
—
SDIR
SINV
—
SMIF
Initial value
1
1
1
1
0
0
1
0
Read/Write
—
—
—
—
R/W
R/W
—
R/W
Serial Communication Mode Select
0 Normal SCI mode
1 Reserved mode
Data Invert
0 TDR contents are transmitted as they are.
Receive data is stored in RDR as it is.
1 TDR contents are inverted before being transmitted.
Receive data is stored in RDR in inverted form.
Data Transfer Direction
0 TDR contents are transmitted LSB-first.
Receive data is stored in RDR LSB-first
1 TDR contents are transmitted MSB-first.
Receive data is stored in RDR MSB-first.
513
ADDRA (H and L)—A/D Data Register A
Bit
15
14
13
12
11
10
H'FFE0, H'FFE1
9
8
7
6
A/D
5
4
3
2
1
0
AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 —
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
ADDRAH
ADDRAL
A/D Conversion Data
10-bit data giving an A/D conversion result
ADDRB (H and L)—A/D Data Register B
Bit
15
14
13
12
11
10
Reserved Bits
H'FFE2, H'FFE3
9
8
7
6
A/D
5
4
3
2
1
0
AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 —
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
ADDRBH
A/D Conversion Data
10-bit data giving an A/D conversion result
514
ADDRBL
Reserved Bits
ADDRC (H and L)—A/D Data Register C
Bit
15
14
13
12
11
10
H'FFE4, H'FFE5
9
8
7
6
A/D
5
4
3
2
1
0
AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 —
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
ADDRCH
ADDRCL
A/D Conversion Data
10-bit data giving an A/D conversion result
ADDRD (H and L)—A/D Data Register D
Bit
15
14
AD9 AD8
13
12
11
10
Reserved Bits
H'FFE6, H'FFE7
9
8
7
6
AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
A/D
5
4
3
2
1
0
—
—
—
—
—
—
Initial value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Read/Write
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
ADDRDH
A/D Conversion Data
10-bit data giving an A/D conversion result
ADDRDL
Reserved Bits
515
ADCSR—A/D Control/Status Register
Bit
H'FFE8
A/D
7
6
5
4
3
2
1
0
ADF
ADIE
ADST
SCAN
CKS
CH2
CH1
CH0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/(W)*
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Channel Select
Group
Selection
CH2
0
Channel
Selection
CH1
0
1
1
0
1
CH0
0
1
0
1
0
1
0
1
Description
Single Mode
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
Scan Mode
AN0
AN0, AN1
AN0 to AN2
AN0 to AN3
AN4
AN4 to AN5
AN4 to AN6
AN4 to AN7
Clock Select
0 Conversion time = 266 states (max)
1 Conversion time = 134 states (max)
Scan Mode
0 Single mode
1 Scan mode
A/D Start
0 A/D conversion is stopped
1 1. Single mode:
A/D conversion starts; ADST is automatically cleared to 0 when conversion ends
2. Scan mode:
A/D conversion starts and continues, cycling among the selected channels,
until ADST is cleared to 0 by software, by a reset, or by a transition to standby mode
A/D Interrupt Enable
0 A/D end interrupt request is disabled
1 A/D end interrupt request is enabled
A/D End Flag
0 Cleared by reading ADF = 1, then writing 0 in ADF
1 Set when A/D conversion ends in single mode.
Set when A/D conversion ends on all selected channels in scan mode.
Note: * Only 0 can be written, to clear the flag.
516
ADCR—A/D Control Register
Bit
H'FFE9
A/D
7
6
5
4
3
2
1
0
TRGE
—
—
—
—
—
—
—
Initial value
0
1
1
1
1
1
1
1
Read/Write
R/W
—
—
—
—
—
—
—
Trigger Enable
0 A/D conversion cannot be externally triggered
1 A/D conversion starts at the fall of the external trigger signal (ADTRG)
517
TPMR—TPC Output Mode Register
Bit
H'FFEA
TPC
7
6
5
4
—
—
—
—
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
R/W
R/W
R/W
R/W
3
2
G3NOV G2NOV
1
0
G1NOV G0NOV
Group 0 Non-Overlap
0 Normal operation in TPC group 0, output values
changing at selected FRT compare match
1 Non-overlapping operation in TPC group 0,
using selected FRT compare match A and B
Group 1 Non-Overlap
0 Normal operation in TPC group 1, output values
changing at selected FRT compare match
1 Non-overlapping operation in TPC group 1,
using selected FRT compare match A and B
Group 2 Non-Overlap
0 Normal operation in TPC group 2, output values
changing at selected FRT compare match
1 Non-overlapping operation in TPC group 2,
using selected FRT compare match A and B
Group 3 Non-Overlap
0 Normal operation in TPC group 3, output values
changing at selected FRT compare match
1 Non-overlapping operation in TPC group 3,
using selected FRT compare match A and B
518
TPCR—TPC Output Control Register
Bit
7
6
5
H'FFEB
4
3
TPC
2
1
0
G3CMS1 G3CMS0 G2CMS1 G2CMS0 G1CMS1 G1CMS0 G0CMS1 G0CMS0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Group 0 Compare Match Select 1 and 0
Bit 1
G0CMS1
0
Bit 0
G0CMS0
0
1
1
0
1
Output Trigger Selection
TPC output group 0 (TP3 to TP0) is triggered
by compare match A in FRT1
TPC output group 0 (TP3 to TP0) is triggered
by compare match A in FRT0
TPC output group 0 (TP3 to TP0) is triggered by compare
match B in FRT1 (and can be non-overlapped)
TPC output group 0 (TP3 to TP0) is triggered by compare
match B in FRT0 (and can be non-overlapped)
Group 1 Compare Match Select 1 and 0
Bit 3
G1CMS1
0
Bit 2
G1CMS0
0
1
1
0
1
Output Trigger Selection
TPC output group 1 (TP7 to TP4) is triggered
by compare match A in FRT1
TPC output group 1 (TP7 to TP4) is triggered
by compare match A in FRT0
TPC output group 1 (TP7 to TP4) is triggered by compare
match B in FRT1 (and can be non-overlapped)
TPC output group 1 (TP7 to TP4) is triggered by compare
match B in FRT0 (and can be non-overlapped)
Group 2 Compare Match Select 1 and 0
Bit 5
G2CMS1
0
Bit 4
G2CMS0
0
1
1
0
1
Output Trigger Selection
TPC output group 2 (TP11 to TP8) is triggered
by compare match A in FRT1
TPC output group 2 (TP11 to TP8) is triggered
by compare match A in FRT0
TPC output group 2 (TP11 to TP8) is triggered by compare
match B in FRT1 (and can be non-overlapped)
TPC output group 2 (TP11 to TP8) is triggered by compare
match B in FRT0 (and can be non-overlapped)
Group 3 Compare Match Select 1 and 0
Bit 7
G3CMS1
0
Bit 6
G3CMS0
0
1
1
0
1
Output Trigger Selection
TPC output group 3 (TP15 to TP12) is triggered
by compare match A in FRT1
TPC output group 3 (TP15 to TP12) is triggered
by compare match A in FRT0
TPC output group 3 (TP15 to TP12) is triggered by compare
match B in FRT1 (and can be non-overlapped)
TPC output group 3 (TP15 to TP12) is triggered by compare
match B in FRT0 (and can be non-overlapped)
519
PCCSR—Parallel Communication Control/Status Register H'FFF0 (000*1 from Master)
DTU
Bit
7
QREF
6
5
4
3
EWRQ EWAKAR ERAKAR MWEF
2
1
0
MREF
EMWI
EMRI
0
0
0
0
0
1
0
0
Internal CPU
R
R
R
R
R/(W)
R/(W)
R/W
R/W
Master CPU
R
R/W
R/W
R/W
R
R
R
R
Initial value
Read/Write
Enable Master Read Interrupt
0 Disables interrupt request (MREI) by MREF
1 Enables interrupt request (MREI) by MREF
Enable Master Write Interrupt
0 Disables interrupt request (MWEI) by MWEF
1 Enables interrupt request (MWEI) by MWEF
Master Read End Flag*2
Master Write End Flag*2
Enable Write Acknowledge and Request*2
(Enables operation of the RDY pin by master write access)
Enable Read Acknowledge and Request*2
(Enables operation of the RDY pin by master read access)
Enable Wait Request*2
(Enables operation of the WRQ pin)
Query Read End Flag
0 DPDRRQ contains data
Cleared when DTC writes on-chip RAM data in DPDRRQ
1 DPDRRQ contains the lower byte of an on-chip RAM address
Set when master CPU writes lower byte of an on-chip
RAM address in DPDRRQ
Notes: 1. Value of register select inputs (RS2 to RS0) by which the master CPU selects
a PBI register.
2. For details see section 5, DTU.
520
DPDRRQ—DPRAM Data Register Query Read
— (001 from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Internal CPU
W*
W*
W*
W*
W*
W*
W*
W*
Master CPU
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Read/Write
On-chip RAM data, or lower 8 bits of on-chip RAM address
Note: * Transferred automatically from on-chip RAM by DTU.
RLARA—Reload Address Register A
H'FFF2 (— from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Data for initializing DTAR at boundary overflow
RLARB—Reload Address Register B
H'FFF3 (— from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Data for initializing DTAR at boundary overflow,
and auxiliary pointer in ring-buffer mode
521
CPARB—Compare Address Register B
H'FFF4 (— from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Auxiliary pointer in ring-buffer mode
DTARH—Data Transfer Address Register H
H'FFF5 (— from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Upper 8 bits of on-chip RAM address
522
IOCR—I/O Control Register
Bit
H'FFF1 (— from Master)
DTU
7
6
5
4
3
2
1
0
HSCE
DPEA
DPEB
RPEA
RPEB
RPEC
—
—
Initial value
0
0
0
0
0
0
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
—
—
Repeat Enable
0 Transfer in normal mode
1 Transfer in repeat mode
DPRAM Enable
0 I/O transfer or direct word mode
1 Bound buffer mode
Parallel Handshake Enable
0 Handshake mode
1 DPRAM mode
Note: The DPME, HSCE, DPEA, and DPEB bits combine to specify the following modes.
DTC Operating Mode Settings
DPME
1
0
Hand- Query Buffer
Bound Buffer
Bound Buffer
Direct Word
Bit 7 Bit 6 Bit 5
shake
Operation
Mode
Mode
Mode
HSCE DPEA DPEB
Mode (DTC Channel R) (DTC Channel A) (DTC Channel B) (DPDRRH/L)
×
Direct Word
Mode
(DPDRWH/L)
1
—
—
I/O transfer
I/O transfer
Handshake
Handshake
0
0
0
×
(read)
I/O transfer
I/O transfer
(read)
(write)
1
0
×
(read)
(read)
I/O transfer
0
1
×
(read)
I/O transfer
(write)
1
1
×
—
—
×
—
(read)
×
(read)
(write)
I/O transfer
I/O transfer
Bound buffer
(read)
(write)
Bound buffer
Bound buffer
Bound buffer
×
×
Note: For I/O transfer, set the DTE bit to 1 in DTCRA, DTCRB, or DTCRC.
Handshake mode operation is only supported in single-chip mode.
Do not set bit HSCE to 1 in expanded mode.
523
DTCRA—Data Transfer Control Register A
Bit
H'FFF6 (010 from Master)
DTU
7
6
5
4
3
2
1
0
DTE
DTIE
BUD2
BUD1
BUD0
SOS2
SOS1
SOS0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Internal CPU
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Master CPU
0
R
R
R
R
R
R
R
Initial value
Read/Write
I/O transfer
Bound buffer
Source Select
SOS2 SOS1 SOS0 Interrupt Source
RXI0
0
0
1
TXI0
0
1
0
ADI
0
1
1
OCIA1
1
0
0
OCIA1
1
0
1
OCIB1
1
1
0
—
1
1
1
Module
SCI0
SCI0
ADC
FRT1
FRT1
FRT1
—
Clearing of Source
Transfer
RDR → RAM (byte)
RAM → TDR (byte)
ADDRA → RAM (word)
RAM → OCRA (word)
RAM → OCRA (word)
×
RAM → OCRB (word)
×
Reserved
—
Boundary
BUD2 BUD1 BUD0 DTAR Overflow Timing
End of each byte transfer
0
0
0
Carry from bit 0 to bit 1
0
0
1
Carry from bit 1 to bit 2
0
1
0
Carry from bit 2 to bit 3
0
1
1
Carry from bit 3 to bit 4
1
0
0
Carry from bit 4 to bit 5
1
0
1
Carry from bit 5 to bit 6
1
1
0
Carry from bit 6 to bit 7
1
1
1
Max. Bytes Transferred
1
2
4
8
16
32
64
128
Data Transfer Interrupt Enable
0 Disables the interrupt requested when the DTE bit is cleared to 0 (DTIA)
1 Enables the interrupt requested when the DTE bit is cleared to 0 (DTIA)
Data Transfer Enable
0
1
Indicates that I/O transfer is halted
Cleared when 0 is written in DTE, or when a transfer terminates at the boundary in normal mode
Indicates that I/O transfer is in progress
Set by reading DTCR while DTE = 0, then writing 1 in DTE
Note: 0: Always read as 0.
524
DTARA—Data Transfer Address Register A
H'FFF7 (011 from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Internal CPU
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Master CPU
R
R
R
R
R
R
R
R
Read/Write
I/O transfer
Bound buffer
Lower 8 bits of on-chip RAM address
525
DTCRB—Data Transfer Control Register B
Bit
H'FFF8 (010 from Master)
DTU
7
6
5
4
3
2
1
0
DTE
DTIE
BUD2
BUD1
BUD0
SOS2
SOS1
SOS0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Internal CPU
0
0
R
R
R
0
0
0
Master CPU
—
—
W
W
W
—
—
—
Initial value
Read/Write
I/O transfer
Bound buffer
Source Select
SOS2 SOS1 SOS0 Interrupt Source
RXI0
0
0
1
TXI0
0
1
0
ADI
0
1
1
OCIA1
1
0
0
OCIA1
1
0
1
OCIA1
1
1
0
OCIA1
1
1
1
Module
SCI0
SCI0
ADC
TPC
TPC
FRT1
FRT1
Clearing of Source
Transfer
RDR → RAM (byte)
RAM → TDR (byte)
ADDRA → RAM (word)
RAM → NDRB (word)
RAM → NDRA (byte)
RAM → OCRA (word)
RAM → OCRA (word)
×
Boundary
BUD2 BUD1 BUD0 DTAR Overflow Timing
End of each byte transfer
0
0
0
Carry from bit 0 to bit 1
0
1
0
Carry from bit 1 to bit 2
1
0
0
Carry from bit 2 to bit 3
1
1
0
Carry from bit 3 to bit 4
0
0
1
Carry from bit 4 to bit 5
0
1
1
Carry from bit 5 to bit 6
1
0
1
Carry from bit 6 to bit 7
1
1
1
Max. Bytes Transferred
1
2
4
8
16
32
64
128
Data Transfer Interrupt Enable
0 Disables the interrupt requested when the DTE bit is cleared to 0 (DTIB)
1 Enables the interrupt requested when the DTE bit is cleared to 0 (DTIB)
Data Transfer Enable
0
1
Indicates that I/O transfer is halted
Cleared when 0 is written in DTE, or when a transfer terminates at the boundary in normal mode
Indicates that I/O transfer is in progress
Set by reading DTCR while DTE = 0, then writing 1 in DTE
Notes: — : Cannot be used. Cannot be modified.
0 : Always read as 0.
526
DTARB—Data Transfer Address Register B
H'FFF9 (011 from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Internal CPU
R
R
R
R
R
R
R
R
Master CPU
W
W
W
W
W
W
W
W
Read/Write
I/O transfer
Bound buffer
Lower 8 bits of on-chip RAM address
527
DTCRC—Data Transfer Control Register C
Bit
H'FFFA (— from Master)
DTU
7
6
5
4
3
2
1
0
DTE
DTIE
BUD2
BUD1
BUD0
SOS2
SOS1
SOS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Source Select
SOS2 SOS1 SOS0 Interrupt Source
RXI0
0
0
1
TXI0
0
1
0
ADI
0
1
1
OCIB1
1
0
0
OCIA1
1
0
1
OCIB1
1
1
0
OCIA1
1
1
1
Module
SCI0
SCI0
ADC
TPC
TPC
TPC
TPC
Clearing of Source
Transfer
RDR → RAM (byte)
RAM → TDR (byte)
ADDRA → RAM (word)
RAM → NDRB (word)
RAM → NDRB (word)
RAM → NDRA (byte)
RAM → NDRA (byte)
Boundary
BUD2 BUD1 BUD0 DTAR Overflow Timing
End of each byte transfer
0
0
0
Carry from bit 0 to bit 1
0
0
1
Carry from bit 1 to bit 2
0
1
0
Carry from bit 2 to bit 3
0
1
1
Carry from bit 3 to bit 4
1
0
0
Carry from bit 4 to bit 5
1
0
1
Carry from bit 5 to bit 6
1
1
0
Carry from bit 6 to bit 7
1
1
1
Max. Bytes Transferred
1
2
4
8
16
32
64
128
Data Transfer Interrupt Enable
0 Disables the interrupt requested when the DTE bit is cleared to 0 (DTIC)
1 Enables the interrupt requested when the DTE bit is cleared to 0 (DTIC)
Data Transfer Enable
0
1
528
Indicates that I/O transfer is halted
Cleared when 0 is written in DTE, or when a transfer terminates at the boundary in normal mode
Indicates that I/O transfer is in progress
Set by reading DTCR while DTE = 0, then writing 1 in DTE
DTARC—Data Transfer Address Register C
H'FFFB (— from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Lower 8 bits of on-chip RAM address
DPDRWH—DPRAM Data Register Write H
H'FFFC (100 from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
On-chip CPU
R*
R *
R*
R*
R *
R *
R*
R *
Master CPU
W
W
W
W
W
W
W
W
Internal CPU
R
R
R
R
R
R
R
R
Master CPU
W
W
W
W
W
W
W
W
Read/Write
Bound buffer mode
Direct word mode
Data register reserved for write access by master CPU.
Note: * Transferred to on-chip RAM automatically by the DTU.
529
DPDRWL—DPRAM Data Register Write L
H'FFFD (101 from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
On-chip CPU
R *1
R *1
R*1
R *1
R *1
R*1
R *1
R *1
Master CPU
W
W
W
W
W
W
W
W
Internal CPU
R
R
R
R
R
R
R
R
Master CPU
W
W
W
W
W
W
W
W
Read/Write
Bound buffer mode
Direct word mode
Handshake mode
Internal CPU
R
R
R
R
R
R
R
R
Master CPU
W *2
W *2
W *2
W *2
W *2
W *2
W *2
W *2
Data register reserved for write access by master CPU.
Notes: 1. Transferred to on-chip RAM automatically by the DTU.
2. Data on the DDB lines is latched at the falling edge of the WE input.
DPDRRH—DPRAM Data Register Read H
H'FFFE (110 from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
On-chip CPU
W*
W*
W*
W*
W*
W*
W*
W*
Master CPU
R
R
R
R
R
R
R
R
Internal CPU
W
W
W
W
W
W
W
W
Master CPU
R
R
R
R
R
R
R
R
Read/Write
Bound buffer mode
Direct word mode
Data register reserved for read access by the master CPU.
Note: * Transferred from on-chip RAM automatically by the DTU.
530
DPDRRL—DPRAM Data Register Read L
H'FFFF (111 from Master)
DTU
Bit
7
6
5
4
3
2
1
0
Initial value
—
—
—
—
—
—
—
—
On-chip CPU
W *1
W *1
W *1
W *1
W *1
W *1
W *1
W *1
Master CPU
R
R
R
R
R
R
R
R
Internal CPU
W
W
W
W
W
W
W
W
Master CPU
R
R
R
R
R
R
R
R
Internal CPU
W
W
W
W
W
W
W
W
Master CPU
R *2
R *2
R *2
R *2
R *2
R *2
R *2
R*2
Read/Write
Bound buffer mode
Direct word mode
Handshake mode
Data register reserved for read access by the master CPU.
Notes: 1. Transferred from on-chip RAM automatically by the DTU.
2. Data is output on the DDB lines when the OE input is low.
531
Appendix C I/O Port Block Diagrams
C.1
Port 1 Block Diagram
RP1P
Mode 1
Hardware standby
WP1P
Reset
S R *
Q
D
P1nDD
C
Mode 3
Internal lower address bus
R
Q
D
P1nPCR
C
Internal data bus
Reset
WP1D
TPC
Reset
R
Q
D
P1nDR
C
P1n
Next data
WP1D
Output trigger
Output enable
Mode 1
Mode 2
RP1
WP1P: Write to P1PCR
WP1D: Write to P1DDR
WP1:
Write to port 1
RP1P: Read P1PCR
RP1:
Read port 1
n = 0 to 7
Note: * Set priority
Figure C.1 Port 1 Block Diagram
532
C.2
Port 2 Block Diagram
RP2P
WP2P
Mode 1
Reset
S R *
Q
D
P2nDD
C
Hardware standby
Mode 3
Internal upper address bus
R
Q
D
P2nPCR
C
Internal data bus
Reset
WP2D
TPC
Reset
R
Q
D
P2nDR
C
P2n
Next data
WP2D
Output trigger
Output enable
Mode 1
Mode 2
RP2
WP2P: Write to P2PCR
WP2D: Write to P2DDR
WP2:
Write to port 2
RP2P: Read P2PCR
RP2:
Read port 2
n = 0 to 7
Note: * Set priority
Figure C.2 Port 2 Block Diagram
533
C.3
Port 3 Block Diagram
DPME Mode 3
RP3P
WP3P
CS
OE
Reset
R
Q
D
P3nDDR
C
External
address
write
WP3D
Reset
R
Q
D
P3nDR
C
P3n
WP3
Modes 1 and 2
CS
WE
External
address read
WP3P: Write to P3PCR
WP3D: Write to P3DDR
WP3:
Write to port 3
RP3P: Read P3PCR
RP3:
Read port 3
n = 0 to 7
Note: When HSCE = 1, CS is internally fixed to 0.
Figure C.3 Port 3 Block Diagram
534
RP3
DPRAM data bus
R
Q
D
P3nPCR
C
Internal data bus
Reset
Mode 3
DPME Modes 1 and 2
OE
CS
Reset
R
Q
D
P4nDDR
C
DPRAM data bus
Port 4 Block Diagrams
Internal data bus
C.4
WP4D
P4n
CS
WE
Reset
R
Q
D
P4nDR
C
WP4
RP4
8-bit timer
input bus
8-bit timer
Counter clock input
Counter reset input
WP4D: Write to P4DDR
WP4:
Write to port 4
RP4:
Read port 4
n = 0, 2, 3, 5
Note: When HSCE = 1, CS is internally fixed to 0.
Figure C.4 (a) Port 4 Block Diagram (Pins P4 0, P42, P43, P45)
535
Reset
R
Q
D
P4nDDR
C
WP4D
Reset
R
Q
D
P4nDR
C
P4n
WP4
CS
WE
DPRAM data bus
OE
CS
Internal data bus
DPME Modes 1 and 2
8-bit timer
Free-running timer
Output enable
8-bit timer output
Output compare
output
RP4
WP4D: Write to P4DDR
WP4:
Write to port 4
RP4:
Read port 4
n = 1, 4, 6, 7
Note: When HSCE = 1, CS is internally fixed to 0.
Figure C.4 (b) Port 4 Block Diagram (Pins P41, P44, P46, P47)
536
C.5
Port 5 Block Diagrams
R
Q
D
P50DDR
C
WP5D
Internal data bus
Reset
Reset
R
Q
D
P50DR
C
P50
SCI
WP5
Output enable
Serial transmit
data
RP5
WP5D: Write to P5DDR
WP5:
Write to port 5
RP5:
Read port 5
Figure C.5 (a) Port 5 Block Diagram (Pin P5 0)
537
R
Q
D
P51DDR
C
WP5D
Internal data bus
Reset
SCI
Input enable
Reset
R
Q
D
P51DR
C
P51
WP5
RP5
WP5D: Write to P5DDR
WP5:
Write to port 5
RP5:
Read port 5
Figure C.5 (b) Port 5 Block Diagram (Pin P51)
538
Serial receive
data
R
Q
D
P52DDR
C
WP5D
Reset
Internal data bus
Reset
SCI
Clock input
enable
R
Q
D
P52DR
C
P52
WP5
Clock output
enable
Clock output
RP5
Clock input
WP5D: Write to P5DDR
WP5:
Write to port 5
RP5:
Read port 5
Figure C.5 (c) Port 5 Block Diagram (Pin P52)
539
C.6
Port 6 Block Diagrams
R
Q
D
P6nDDR
C
WP6D
Reset
Internal data bus
Reset
R
Q
D
P6nDR
C
P6n
WP6
RP6
Free-running timer
Input capture input
WP6D: Write to P6DDR
WP6: Write to port 6
RP6:
Read port 6
n = 0, 3, 5
DPME
Modes 1 and 2
Counter clock input
8-bit timer input bus
Figure C.6 (a) Port 6 Block Diagram (Pins P6 0, P63, P65)
540
R
Q
D
P61DDR
C
WP6D
Internal data bus
Reset
Reset
R
Q
D
P61DR
C
P61
Free-running timer
WP6
Output enable
Output compare
output
RP6
WP6D: Write to P6DDR
WP6:
Write to port 6
RP6:
Read port 6
Figure C.6 (b) Port 6 Block Diagram (Pin P61)
541
R
Q
D
P62DDR
C
WP6D
Internal data bus
Reset
Reset
R
Q
D
P62DR
C
P62
WP6
RP6
Free-running timer
WP6D: Write to P6DDR
WP6:
Write to port 6
RP6:
Read port 6
Figure C.6 (c) Port 6 Block Diagram (Pin P62)
542
Input capture
input
R
Q
D
P64DDR
C
WP6D
Internal data bus
Reset
Reset
R
Q
D
P64DR
C
P64
Modes 1 and 2
DPME
8-bit timer
WP6
Output enable
8-bit timer output
RP6
Free-running timer
WP6D: Write to P6DDR
WP6:
Write to port 6
RP6:
Read port 6
Input capture
input
Figure C.6 (d) Port 6 Block Diagram (Pin P64)
543
R
Q
D
P66DDR
C
WP6D
Internal data bus
Reset
Reset
P66
R
Q
D
P66DR
C
Free-running timer
WP6
Output enable
Output compare
output
RP6
DPME
Modes 1 and 2
8-bit timer input bus
(TMRI1)
IRQ6 input
WP6D: Write to P6DDR
WP6:
Write to port 6
RP6:
Read port 6
IRQ enable register
IRQ6 enable
Figure C.6 (e) Port 6 Block Diagram (Pin P66)
544
R
Q
D
P67DDR
C
WP6D
Internal data bus
Reset
Reset
P67
R
Q
D
P67DR
C
Modes 1 and 2
DPME
8-bit timer
WP6
Output enable
8-bit timer output
RP6
IRQ7 input
WP6D: Write to P6DDR
WP6:
Write to port 6
RP6:
Read port 6
IRQ enable register
IRQ7 enable
Figure C.6 (f) Port 6 Block Diagram (Pin P67)
545
Port 7 Block Diagram
RP7
P7n
Internal data bus
C.7
A/D converter
Analog input
RP7: Read port 7
n = 0 to 7
Figure C.7 Port 7 Block Diagram (Pins P70 to P77)
546
Port 8 Block Diagrams
DPME HSCE
Reset
R
Q
D
P8nDDR
C
WP8D
Reset
Internal data bus
C.8
R
Q
D
P8nDR
C
P8n
WP8
RP8
PBI
WP8D: Write to P8DDR
WP8: Write to port 8
RP8:
Read port 8
n = 0 to 2
Register
select
input
Figure C.8 (a) Port 8 Block Diagram (Pins P8 0 to P82)
547
Reset
R
Q
D
P83DDR
C
WP8D
Internal data bus
DPME
PBI
WRQ output enable
WRQ signal
P83
Modes 1 and 2
RDY signal
Reset
R
Q
D
P83DR
C
WP8
RP8
WP8D: Write to P8DDR
WP8:
Write to port 8
RP8:
Read port 8
Figure C.8 (b) Port 8 Block Diagram (Pin P83)
548
R
Q
D
P84DDR
C
WP8D
Internal data bus
Reset
Reset
P84
R
Q
D
P84DR
C
SCI
WP8
Output enable
Serial transmit data
RP8
IRQ3 input
IRQ enable register
IRQ3 enable
WP8D: Write to P8DDR
WP8:
Write to port 8
RP8:
Read port 8
DPME
Modes 1 and 2
PBI input bus (WE)
Figure C.8 (c) Port 8 Block Diagram (Pin P84)
549
R
Q
D
P85DDR
C
Internal data bus
Reset
SCI
WP8D
Input enable
Reset
P85
R
Q
D
P85DR
C
WP8
RP8
Serial receive
data
IRQ4 input
IRQ enable register
IRQ4 enable
WP8D: Write to P8DDR
WP8:
Write to port 8
RP8:
Read port 8
Figure C.8 (d) Port 8 Block Diagram (Pin P85)
550
R
D
Q
P86DDR
C
Internal data bus
Reset
SCI
WP8D
Clock input enable
Reset
P86
R
Q
D
P86DR
C
WP8
Clock output enable
Clock output
RP8
Clock input
IRQ5 input
IRQ enable register
IRQ5 enable
WP8D: Write to P8DDR
WP8:
Write to port 8
RP8:
Read port 8
DPME
Modes 1 and 2
PBI input bus (OE)
Figure C.8 (e) Port 8 Block Diagram (Pin P86)
551
C.9
Port 9 Block Diagrams
R
Q
D
P90DDR
C
WP9D
Reset
Internal data bus
Reset
R
Q
D
P90DR
C
P90
WP9
RP9
A/D converter
External trigger
input
IRQ2 input
IRQ enable register
IRQ2 enable
WP9D: Write to P9DDR
WP9: Write to port 9
RP9:
Read port 9
Figure C.9 (a) Port 9 Block Diagram (Pin P9 0)
552
R
Q
D
P91DDR
C
WP9D
Reset
R
Q
D
P91DR
C
P91
Internal data bus
Reset
WP9
RP9
IRQ1 input
IRQ enable register
WP9D: Write to P9DDR
WP9: Write to port 9
RP9:
Read port 9
IRQ1 enable
DPME
Modes 1 and 2
PBI input bus (CS)
Figure C.9 (b) Port 9 Block Diagram (Pin P91)
553
R
Q
D
P92DDR
C
WP9D
Reset
R
Q
D
P92DR
C
P92
Internal data bus
Reset
WP9
RP9
IRQ0 input
IRQ enable register
WP9D: Write to P9DDR
WP9: Write to port 9
RP9:
Read port 9
Figure C.9 (c) Port 9 Block Diagram (Pin P92)
554
IRQ0 enable
Hardware standby
Modes 1 and 2
Reset
R
Q
D
P9nDDR
C
WP9D
Mode 3
P9n
Modes 1 and 2
Internal data bus
DPME Mode 3
Reset
R
Q
D
P9nDR
C
WP9
RD output
WR output
RP9
PBI
WP9D: Write to P9DDR
WP9: Write to port 9
RP9:
Read port 9
n = 3, 4
PBI
input bus
CE input
OE input
Figure C.9 (d) Port 9 Block Diagram (Pins P93, P94)
555
DPME Mode 3
Modes 1 and 2
Reset
R
Q
D
P95DDR
C
WP9D
Internal data bus
Hardware standby
PBI
RDY output
P95
Reset
R
Q
D
P95DR
C
WP9
*
Modes 1 and 2
RP9
WP9D: Write to P9DDR
WP9:
Write to port 9
RP9:
Read port 9
Note: * NMOS open drain when DPME = 1 in mode 3.
Figure C.9 (e) Port 9 Block Diagram (Pin P95)
556
AS output
Modes 1 and 2
Reset
S R
Q
D
P96DDR
C
WP9D
P96
*
Internal data bus
Hardware standby
ø
RP9
WP9D: Write to P9DDR
Write to port 9
WP9:
Read port 9
RP9:
Note: * Set priority
Figure C.9 (f) Port 9 Block Diagram (Pin P96)
557
Modes 1 and 2
Reset
R
Q
D
P97DDR
C
WP9D
Internal data bus
DPME Mode 3
Reset
R
Q
D
P97DR
C
P97
WP9
RP9
WAIT input
PBI
WP9D: Write to P9DDR
WP9: Write to port 9
RP9:
Read port 9
PBI input bus
Figure C.9 (g) Port 9 Block Diagram (Pin P9 7)
558
WE input
Appendix D Pin States
D.1
Port States in Each Mode
Table D.1
Port States
Pin Name
Mode
Reset
Hardware
Software
Standby Mode Standby Mode
Program
Sleep Mode Execution Mode
P17 to P1 0
1
L
T
keep* 1
A7 to A 0
2
T
(DDR = 1) L/keep
TP 7 to TP0
keep
P27 to P2 0
1
L
A15 to A 8
2
T
T
3
P37 to P3 0
1
D7 to D0
2
T
T
DDB7 to DDB 0 3
1
I/O port
L
keep*
(DDR = 1) L/keep
TP 15 to TP8
A7 to A 0
Address output
or input port
(DDR = 0) keep
3
P47 to P4 0
L
1
A15 to A 8
(DDR = 0) keep
Address output
or input port
keep
I/O port
T
keep
T
D7 to D0
keep
I/O port
2
keep
I/O port
T
T
keep*
T
T
keep* 2
keep
I/O port
T
T
keep* 2
keep
I/O port
T
T
T
T
Input port
T
T
keep* 2
keep
I/O port
2
3
P52 to P5 0
1
2
3
P67 to P6 0
1
2
3
P77 to P7 0
1
2
3
P86 to P8 0
1
2
3
559
Table D.1
Port States (cont)
Pin Name
Mode
Reset
Hardware
Software
Standby Mode Standby Mode
Program
Sleep Mode Execution Mode
P97/WAIT
1
T
T
T
T
WAIT or I/O port
keep
keep
I/O port
H
Clock output Clock output
2
Clock T
output
3
T
(DDR = 1) H
(DDR = 0) T
Clock output Clock output
(DDR = 1) or (DDR = 1) or
T (DDR = 0) input port
(DDR = 0)
H
H
AS, WR, RD
keep
keep
I/O port
keep
keep
I/O port
2
3
P96/ø
1
P95 to P9 3
1
AS, WR, RD
2
P92 to P9 0
H
3
T
1
T
T
T
2
3
Legend
H:
High
L:
Low
T:
High-impedance state
keep: Input pins are in the high-impedance state (with input pull-up on if PCR = 1) ; output pins
maintain their previous state.
Notes: 1. Address output pins hold the last address accessed.
2. On-chip supporting modules are initialized, so these pins revert to I/O ports controlled
by their DDR and DR bits.
560
Appendix E Timing of Transition to and Recovery from
Hardware Standby Mode
Timing of Transition to Hardware Standby Mode
(1) To retain RAM contents when the RAME bit in SYSCR is cleared to 0, drive the RES signal
low 10 system clock cycles before the STBY signal goes low, as shown below. RES must
remain low until STBY goes low (minimum delay from STBY low to RES high: 0 ns).
STBY
t1 ≥ 10 tcyc
t2 ≥ 0 ns
RES
(2) When the RAME bit in SYSCR is set to 1 or when it is not necessary to retain RAM contents,
RES does not have to be driven low as in (1).
Timing of Recovery From Hardware Standby Mode: Drive the RES signal low approximately
100 ns before STBY goes high.
STBY
t ≥ 100 ns
tOSC
RES
561
Appendix F Product Code Lineup
Table F.1 H8/3318 Product Code Lineup
Package (Hitachi
Package Code)
Product Type
Product Code
Mark Code
H8/3318
HD6473318CG16
HD6473318CG16
84-pin windowed LCC
(CG-84)
HD6473318CP16
HD6473318CP16
84-pin PLCC
(CP-84)
HD6473318F16
HD6473318F16
80-pin QFP
(FP-80A)
HD6473318TF16
HD6473318TF16
80-pin TQFP
(TFP-80C)
HD6433318CP
HD6433318(***)CP
84-pin PLCC
(CP-84)
HD6433318F
HD6433318(***)F
80-pin QFP
(FP-80A)
HD6433318TF
HD6433318(***)TF
80-pin TQFP
(TFP-80C)
ZTAT version
Mask ROM
version
Note: (***) in mask ROM version is the ROM code.
562
Appendix G Package Dimensions
Figure G.1 shows the dimensions of the FP-80A package. Figure G.2 shows the dimensions of the
TFP-80C package. Figure G.3 shows the dimensions of the CP-84 package. Figure G.4 shows the
dimensions of the CE-84 package
17.2 ± 0.3
Unit: mm
14
60
41
40
0.65
17.2 ± 0.3
61
80
21
1
0.10
*Dimension including the plating thickness
Base material dimension
*0.17 ± 0.05
0.15 ± 0.04
3.05 Max
0.83
2.70
0.12 M
0.10 +0.15
–0.10
*0.32 ± 0.08
0.30 ± 0.06
20
1.6
0° – 8°
0.8 ± 0.3
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-80A
—
Conforms
1.2 g
Figure G.1 Package Dimensions (FP-80A)
563
14.0 ± 0.2
Unit: mm
12
60
41
40
80
21
0.5
14.0 ± 0.2
61
0.10
*Dimension including the plating thickness
Base material dimension
0.10 ± 0.10
1.25
1.00
0.10 M
*0.17 ± 0.05
0.15 ± 0.04
20
1.20 Max
1
*0.22 ± 0.05
0.20 ± 0.04
1.0
0° – 8°
0.5 ± 0.1
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
Figure G.2 Package Dimensions (TFP-80C)
564
TFP-80C
—
Conforms
0.4 g
Unit: mm
30.23 +0.12
–0.13
29.28
74
54
53
84
1
11
0.20 M
1.94
1.27
*0.42 ± 0.10
0.38 ± 0.08
28.20 ± 0.50
*Dimension including the plating thickness
Base material dimension
0.90
0.75
2.55 ± 0.15
33
32
12
4.40 ± 0.20
30.23 +0.12
–0.13
75
28.20 ± 0.50
0.10
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
CP-84
Conforms
Conforms
6.4 g
Figure G.3 Package Dimensions (CP-84)
565
29.21 ± 0.38
Unit: mm
4.03 Max
φ 8.89
12
32
33
0.635
11
1
84
75
53
54
74
2.16
1.27
1.27
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
Figure G.4 Package Dimensions (CG-84)
566
CG-84
—
—
8.96 g
H8/3318 Hardware Manual
Publication Date: 1st Edition, April 1996
2nd Edition, September 1999
Published by:
Electronic Devices Sales & Marketing Group
Semiconductor & Integrated Circuits
Hitachi, Ltd.
Edited by:
Technical Documentation Group
UL Media Co., Ltd.
Copyright © Hitachi, Ltd., 1996. All rights reserved. Printed in Japan.