NEC UPD6P8MC-5A4-A

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD6P8, 6P8A, 6P8B
4-BIT SINGLE-CHIP MICROCONTROLLER
FOR INFRARED REMOTE CONTROL TRANSMISSION
DESCRIPTION
The µPD6P8, 6P8A, 6P8B are microcontrollers for infrared remote control transmitters and are provided with
a one-time PROM as the program memory.
Because users can write programs for the µPD6P8, 6P8A, 6P8B, They are ideal for program evaluation and smallscale production of application systems that use the µPD67A, 67B, 68A, 68B.
When reading this document, also refer to the following documents.
µPD67, 67A, 68, 68A, 69 Data Sheet: U14935E
µPD67B, 68B Data Sheet:
U16792E
FEATURES
• Program memory (one-time PROM):
2026 × 10 bits
• Data memory (RAM):
32 × 4 bits
• On-chip carrier generator for infrared remote control: The high-level and low-level width can be set separately
from 250 ns to 64 µs (@ fX = 4 MHz operation) via modulo
registers
• 9-bit programmable timer:
1 channel
• Instruction execution time:
16 µs (@ fX = 4 MHz)
• Stack level:
1 level (stack RAM is for data memory RF as well)
• I/O pins (KI/O):
8 units
4 units
• Input pins (KI):
2 units
• Sense input pins (S0, S2):
• S1/LED pin (I/O):
1 unit (when in output mode, this is the remote control
transmission display pin)
• Power supply voltage:
VDD = 1.9 to 3.6 V
• Operating ambient temperature:
TA = –40 to +85°C
• Oscillator frequency:
fX = 3.5 to 4.5 MHz
• On-chip POC circuit and RAM retention detector
• On-chip oscillator (µPD6P8B)
APPLICATIONS
Infrared remote control transmitters (for AV and household electric appliances)
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all products and/or types are available in every country. Please check with an NEC Electronics
sales representative for availability and additional information.
Document No. U17848EJ3V0DS00 (3rd edition)
Date Published December 2007 N
Printed in Japan
The mark <R> shows major revised points.
2006
µPD6P8, 6P8A, 6P8B
ORDERING INFORMATION
Part Number
<R>
Package
µPD6P8MC-5A4-A
20-pin plastic SSOP (7.62 mm (300))
µPD6P8AMC-5A4-A
20-pin plastic SSOP (7.62 mm (300))
µPD6P8BMC-5A4-ANote 20-pin plastic SSOP (7.62 mm (300))
Note Under development
Remark Products that have the part numbers suffixed by “-A” are lead-free products.
µPD6P8 PIN CONFIGURATION (TOP VIEW)
20-pin plastic SSOP (7.62 mm (300))
(1) Normal operation mode
KI/O6
1
20
KI/O5
KI/O7
2
19
KI/O4
S0
3
18
KI/O3
S1/LED
4
17
KI/O2
REM
5
16
KI/O1
VDD
6
15
KI/O0
XOUT
7
14
KI3
XIN
8
13
KI2
GND
9
12
KI1
10
11
KI0
S2
(2) PROM programming mode
D6
1
20
D5
D7
2
19
D4
CLK
3
18
D3
4
17
D2
5
16
D1
VDD
6
15
D0
XOUT
7
14
MD3
XIN
8
13
MD2
GND
9
12
MD1
10
11
MD0
(L)
VPP
Caution The item in parentheses indicates the processing of pins not used in the PROM programming
mode.
L: Connect each of these pins to GND via a pull-down resistor.
2
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
µPD6P8A PIN CONFIGURATION (TOP VIEW)
20-pin plastic SSOP (7.62 mm (300))
(1) Normal operation mode
KI/O6
1
20
KI/O5
KI/O7
2
19
KI/O4
S0
3
18
KI/O3
S1/LED
4
17
KI/O2
REM
5
16
KI/O1
VDD
6
15
KI/O0
XOUT
7
14
KI3
XIN
8
13
KI2
GND
9
12
KI1
10
11
KI0
(F)
1
20
(F)
SO
2
19
(F)
SCLK
3
18
(F)
SI
4
17
(F)
(F)
5
16
(F)
VDD
6
15
(F)
XOUT
7
14
(F)
XIN
8
13
(F)
GND
9
12
(F)
10
11
(F)
S2
(2) PROM programming mode
VPP
Caution The item in parentheses indicates the processing of pins not used in the PROM programming
mode.
F: These pins are pulled down internally, so leave them open.
Data Sheet U17848EJ3V0DS
3
µPD6P8, 6P8A, 6P8B
<R> µPD6P8B PIN CONFIGURATION (TOP VIEW)
20-pin plastic SSOP (7.62 mm (300))
(1) Normal operation mode
KI/O6
1
20
KI/O5
KI/O7
2
19
KI/O4
S0
3
18
KI/O3
S1/LED
4
17
KI/O2
REM
5
16
KI/O1
VDD
6
15
KI/O0
IC
7
14
KI3
S3
8
13
KI2
GND
9
12
KI1
10
11
KI0
(F)
1
20
(F)
SO
2
19
(F)
SCLK
3
18
(F)
SI
4
17
(F)
(F)
5
16
(F)
VDD
6
15
(F)
(F)
7
14
(F)
(F)
8
13
(F)
GND
9
12
(F)
10
11
(F)
S2
(2) PROM programming mode
VPP
Caution The item in parentheses indicates the processing of pins not used in the PROM programming
mode.
F: These pins are pulled down internally, so leave them open.
4
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
BLOCK DIAGRAM
Carrier
generator
REM
CPU
core
Onetime
PROM
9-bit
timer
S1/LED
4
Port KI
4
KI0 to KI3
8
Port KI/O
8
KI/O0 to KI/O7
3
Port S
3
S0, S1/LED, S2
RAM
XIN
System
control
XOUT
VDD
GND
LIST OF FUNCTIONS
µPD6P8
Item
ROM capacity
2026 × 10 bits
One-time PROM
RAM capacity
32 × 4 bits
µPD6P8A
Stack
1 level (shared with RF of RAM)
I/O pins
Key input (KI):
Key I/O (KI/O):
Key expansion input (S0, S1, S 2):
Remote control transmission display output (LED):
Number of keys
Clock frequency
µPD6P8B
4
8
3
1
pins
pins
pins
pin (shared with S1 pin)
32 keys
56 keys (when expanded by key expansion input)
Ceramic oscillation
fX = 3.5 to 4.5 MHz
Instruction execution time
16 µs (@ fX = 4 MHz)
Carrier frequency
The high-level and low-level width can be set separately from 250 ns to 64 µs (@ fX = 4 MHz
operation) via modulo registers
Timer
9-bit programmable timer: 1 channel, timer clock: fX/64
POC circuit
On chip
RAM retention detector
On chip
Internal oscillator
Not available
Programming method
Parallel
Supply voltage
V DD = 1.9 to 3.6 V
Operating ambient
temperature
TA = –40 to +85°C
Package
20-pin plastic SSOP (7.62 mm (300))
On chip
Serial
Data Sheet U17848EJ3V0DS
5
µPD6P8, 6P8A, 6P8B
CONTENTS
1. PIN FUNCTIONS .........................................................................................................................
8
1.1
Normal Operation Mode ....................................................................................................................
8
1.2
PROM Programming Mode ............................................................................................................... 10
1.3
Pins I/O Circuits ................................................................................................................................. 11
1.4
Recommended Connection of Unused Pins ................................................................................... 12
1.5
Notes on Using KI Pin After Reset ................................................................................................... 12
2. DIFFERENCES BETWEEN µPD67A, 67B, 68A, 68B, AND µPD6P8, 6P8A, 6P8B .................. 13
3. INTERNAL CPU FUNCTIONS .................................................................................................. 14
3.1
Program Counter (PC): 11 Bits ........................................................................................................ 14
3.2
Stack Pointer (SP): 1 Bit ................................................................................................................... 14
3.3
Address Stack Register (ASR (RF)): 11 Bits ................................................................................... 14
3.4
Program Memory (One-Time PROM): 2,026 Steps × 10 Bits ......................................................... 15
3.5
Data Memory (RAM): 32 × 4 Bits ...................................................................................................... 16
3.6
Data Pointer (DP): 12 Bits ................................................................................................................. 17
3.7
Accumulator (A): 4 Bits .................................................................................................................... 17
3.8
Arithmetic and Logic Unit (ALU): 4 Bits .......................................................................................... 17
3.9
Flags ................................................................................................................................................... 18
3.9.1
Status flag (F) .......................................................................................................................... 18
3.9.2
Carry flag (CY) ........................................................................................................................ 18
4. PORT REGISTERS (PX) ........................................................................................................... 19
4.1
KI/O Port (P0) ....................................................................................................................................... 20
4.2
KI Port/Special Ports (P1) ................................................................................................................. 20
4.3
4.2.1
KI port (P11: bits 4 to 7 of P1) .................................................................................................. 20
4.2.2
S0 port (bit 2 of P1) .................................................................................................................. 21
4.2.3
S1/LED port (bit 3 of P1) .......................................................................................................... 21
4.2.4
S2 port (bit 1 of P1) .................................................................................................................. 21
Control Register 0 (P3) ..................................................................................................................... 22
4.3.1
4.4
RAM retention flag (bit 3 of P3) ............................................................................................... 23
Control Register 1 (P4) ..................................................................................................................... 25
5. TIMER ......................................................................................................................................... 26
5.1
Timer Configuration .......................................................................................................................... 26
5.2
Timer Operation ................................................................................................................................. 27
5.3
5.4
Carrier Output .................................................................................................................................... 29
5.3.1
Carrier output generator .......................................................................................................... 29
5.3.2
Carrier output control .............................................................................................................. 30
Software Control of Timer Output ................................................................................................... 32
6. STANDBY FUNCTION ............................................................................................................... 33
6.1
Outline of Standby Function ............................................................................................................ 33
6.2
Standby Mode Setting and Release ................................................................................................. 34
6.3
Standby Mode Release Timing ........................................................................................................ 36
7. RESET ......................................................................................................................................... 37
6
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
8. POC CIRCUIT ............................................................................................................................ 38
8.1
8.2
Functions of POC Circuit .................................................................................................................. 39
Oscillation Check at Low Supply Voltage ....................................................................................... 39
9. SYSTEM CLOCK OSCILLATOR (µPD6P8, 6P8A) .................................................................. 40
10. INSTRUCTION SET ................................................................................................................... 41
10.1 Machine Language Output by Assembler .......................................................................................
10.2 Circuit Symbol Description ..............................................................................................................
10.3 Mnemonic to/from Machine Language (Assembler Output) Contrast Table ...............................
10.4 Accumulator Manipulation Instructions ..........................................................................................
10.5 I/O Instructions ..................................................................................................................................
10.6 Data Transfer Instructions ................................................................................................................
10.7 Branch Instructions ..........................................................................................................................
10.8 Subroutine Instructions ....................................................................................................................
10.9 Timer Operation Instructions ...........................................................................................................
10.10 Others .................................................................................................................................................
41
42
43
47
50
51
53
54
55
58
11. ASSEMBLER RESERVED WORDS ........................................................................................ 60
11.1 Mask Option Directives ..................................................................................................................... 60
11.1.1 OPTION and ENDOP quasi-directives .................................................................................... 60
11.1.2 Mask option definition quasi-directives ................................................................................... 60
12. WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY) (µPD6P8) ................. 61
12.1 Operating Mode When Writing/Verifying Program Memory .......................................................... 61
12.2 Program Memory Writing Procedure ............................................................................................... 62
12.3 Program Memory Reading Procedure ............................................................................................. 63
13. WRITING AND VERIFICATION OF ONE-TIME PROM (PROGRAM MEMORY) (µPD6P8A, 6P8B) ......... 64
13.1
13.2
13.3
13.4
Initialization ........................................................................................................................................
Serial Communication Format .........................................................................................................
Writing of Program Memory .............................................................................................................
Reading of Program Memory ...........................................................................................................
64
65
66
66
14. ELECTRICAL SPECIFICATIONS (µPD6P8) ............................................................................. 67
15. ELECTRICAL SPECIFICATIONS (µPD6P8A) .......................................................................... 74
16. ELECTRICAL SPECIFICATIONS (µPD6P8B) (TARGET) ........................................................ 79
17. CHARACTERISTIC CURVES (REFERENCE VALUES) (µPD6P8) ....................................... 84
18. APPLICATION CIRCUIT EXAMPLE .......................................................................................... 85
19. PACKAGE DRAWING ................................................................................................................ 88
20. RECOMMENDED SOLDERING CONDITIONS .......................................................................... 89
APPENDIX A. DEVELOPMENT TOOLS ......................................................................................... 90
APPENDIX B. EXAMPLE OF REMOTE CONTROL TRANSMISSION FORMAT (In the case
of NEC transmission format in command one-shot transmission mode) ........ 91
Data Sheet U17848EJ3V0DS
7
µPD6P8, 6P8A, 6P8B
1. PIN FUNCTIONS
1.1 Normal Operation Mode
(1) µ PD6P8, 6P8A
Pin No.
Symbol
Function
1
2
15 to 20
KI/O0 to KI/O7
8-bit I/O port. I/O mode can be switched in 8-bit units.
In input mode, a pull-down resistor is added.
In output mode, these pins can be used as a key scan
outputs from the key matrix.
Output Format
3
S0
Input port.
This pin can also be used as a key return input from the
key matrix.
In input mode, the use of a pull-down resistor for the S0
and S1 ports can be specified by software in 2-bit units.
If input mode is released by software, this pin is placed
in the OFF mode and enters a high-impedance state.
4
S1/LED
I/O port.
In input mode (S1), this pin can also be used as a key
return input from the key matrix.
The use of a pull-down resistor for the S0 and S1 ports
can be specified by software in 2-bit units.
In output mode (LED), this pin becomes the remote
control transmission display output (active low). When
the remote control carrier is output from the REM output,
this pin outputs a low level from the LED output in
synchronization with the REM signal.
CMOS push-pull
High-level output
(LED)
5
REM
Infrared remote control transmission output.
The output is active high.
The carrier high-level and low-level width can each be
freely set in a range of 250 ns to 64 µs (@ fX = 4 MHz)
using software.
CMOS push-pull
Low-level output
6
VDD
Power supply
—
—
7
8
X OUT
X IN
These pins are connected to system clock ceramic
resonators.
—
Low level
(oscillation stopped)
9
GND
GND pin
—
—
10
S2
Input port.
The use of the STOP mode release of the S2 port can be
specified by software.
When using this pin as a key input from the key matrix,
enable the use of the STOP mode release (at this time,
a pull-down resistor is connected internally.)
When the STOP mode release is disabled, this pin can
be used as an input port that does not release the STOP
mode even if the release condition is established (at this
time, a pull-down resistor is not connected internally.)
—
Input
(high impedance,
STOP mode
release cannot be
used)
11 to 14
K I0 to
K I3Note 2
4-bit input port.
These pins can be used as key return inputs to the key
matrix. The use of pull-down resistors can be specified
by software in 4-bit units.
—
Input (low-level)
CMOS
Push-pullNote 1
—
After Reset
High-level output
High-impedance
(OFF mode)
Notes 1. Note that the drive capability of the low-level output side is held low.
2. In order to prevent malfunction, do not input a high-level signal to pins KI0 to KI3 (leaving these pins
open is possible, however, when these pins are left open, do not disconnect any connected pull-down
resistors) when POC is released due to supply voltage startup.
8
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
(2) µ PD6P8B
<R>
Pin No.
Symbol
1
2
15 to 20
KI/O0 to KI/O7
Function
8-bit I/O port. I/O mode can be switched in 8-bit units.
In input mode, a pull-down resistor is added.
In output mode, these pins can be used as a key scan
outputs from the key matrix.
Output Format
3
S0
Input port.
This pin can also be used as a key return input from the
key matrix.
In input mode, the use of a pull-down resistor for the S0
and S1 ports can be specified by software in 2-bit units.
If input mode is released by software, this pin is placed
in the OFF mode and enters a high-impedance state.
4
S1/LED
I/O port.
In input mode (S1), this pin can also be used as a key
return input from the key matrix.
The use of a pull-down resistor for the S0 and S 1 ports
can be specified by software in 2-bit units.
In output mode (LED), this pin becomes the remote
control transmission display output (active low). When
the remote control carrier is output from the REM output,
this pin outputs a low level from the LED output in
synchronization with the REM signal.
CMOS push-pull
High-level output
(LED)
5
REM
Infrared remote control transmission output.
The output is active high.
The carrier high-level and low-level width can each be
freely set in a range of 250 ns to 64 µs (@ fX = 4 MHz)
using software.
CMOS push-pull
Low-level output
CMOS
Push-pullNote 1
—
After Reset
High-level output
High-impedance
(OFF mode)
6
VDD
Power supply
—
—
7
IC
Internally connected pin
—
—
9
GND
GND pin
—
—
8
10
S3
S2
Input port.
The use of the STOP mode release of the S2 and S3 ports
can be specified by software.
When using these pins as a key input from the key
matrix, enable the use of the STOP mode release (at this
time, a pull-down resistor is connected internally.)
When the STOP mode release is disabled, these pins
can be used as an input port that does not release the
STOP mode even if the release condition is established
(at this time, a pull-down resistor is not connected internally.)
—
Input
(high impedance,
STOP mode
release cannot be
used)
11 to 14
KI0 to
KI3Note 2
4-bit input port.
These pins can be used as key return inputs to the key
matrix. The use of pull-down resistors can be specified
by software in 4-bit units.
—
Input (low-level)
Notes 1. Note that the drive capability of the low-level output side is held low.
2. In order to prevent malfunction, do not input a high-level signal to pins KI0 to KI3 (leaving these pins
open is possible, however, when these pins are left open, do not disconnect any connected pull-down
resistors) when POC is released due to supply voltage startup.
Data Sheet U17848EJ3V0DS
9
µPD6P8, 6P8A, 6P8B
1.2 PROM Programming Mode
(1) µ PD6P8
Pin No.
1, 2
Symbol
Function
I/O
D0 to D7
8-bit data I/O when writing/verifying program memory
I/O
CLK
Clock input for updating address when writing/verifying program
Input
15 to 20
3
memory
6
VDD
Power Supply
–
Supply +3 V to this pin when writing/verifying program memory.
7
XOUT
Clock necessary for writing program memory. Connect a 4 MHz ceramic
–
8
XIN
resonator to these pins.
Input
9
GND
GND
–
10
VPP
Supplies voltage for writing/verifying program memory.
–
Apply +10.5 V to this pin.
11 to 14
MD0 to MD3
Input for selecting operation mode when writing/verifying program memory
Input
(2) µ PD6P8A
Pin No.
Symbol
Function
I/O
2
SO
Serial data output when verifying program memory
Output
3
SCLK
Clock input when writing/verifying program memory
Input
4
SI
Serial data input when writing program memory
Input
6
VDD
Power Supply
–
Supply +3 V to this pin when writing/verifying program memory.
7
X OUT
Clock necessary for writing program memory. Connect a 4 MHz ceramic
–
8
X IN
resonator to these pins.
Input
9
GND
GND
–
10
VPP
Supplies voltage for writing/verifying program memory.
–
Apply +10.5 V to this pin.
(3) µ PD6P8B
<R>
Pin No.
Symbol
Function
I/O
2
SO
Serial data output when verifying program memory
Output
3
SCLK
Clock input when writing/verifying program memory
Input
4
SI
Serial data input when writing program memory
Input
6
VDD
Power Supply
–
Supply +3 V to this pin when writing/verifying program memory.
9
GND
GND
–
10
VPP
Supplies voltage for writing/verifying program memory.
–
Apply +10.5 V to this pin.
10
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
1.3 Pins I/O Circuits
The I/O circuits of the µPD6P8, 6P8A, 6P8B pins are shown in partially simplified forms below.
(1) K I/O0 to K I/O7
(4) S 0
VDD
Data
Output
latch
Input buffer
P-ch
OFF mode
N-chNote 1
Output
disable
Selector
Standby
release
N-ch
Pull-down flag
Input buffer
N-ch
(5) S1/LED
VDD
(2) K I0 to K I3
REM
output latch
P-ch
Standby
release
Input buffer
Output
disable
Standby
release
Pull-down flag
N-ch
N-ch
Input buffer
N-ch
Pull-down flag
(6) S 2, S 3Note 2
(3) REM
Standby
release
VDD
Input buffer
P-ch
Data
Output
latch
N-ch
STOP release
ON/OFF
N-ch
Carrier
generator
Notes 1. The drive capability is held low.
2. µPD6P8B only
Data Sheet U17848EJ3V0DS
11
µPD6P8, 6P8A, 6P8B
1.4 Recommended Connection of Unused Pins
The following connections are recommended for unused pins in the normal operation mode.
Table 1-1. Connections for Unused Pins
Connection
Pin
Inside the Microcontroller
KI/O0-KI/O7
Input mode
Output mode
—
High-level output
REM
—
ICNote
Note
Outside the Microcontroller
Leave open
—
S1/LED
Output mode (LED) setting
S0
OFF mode setting
S 2, S3Note
—
KI0-KI3
—
Directly connect these pins
to GND
µPD6P8B only
Caution The I/O mode and the pin output level are recommended to be fixed by setting them repeatedly
in each loop of the program.
1.5 Notes on Using K I Pin After Reset
In order to prevent malfunction, do not input a high-level signal to pins KI0 to KI3 (leaving these pins open is
possible, however, when these pins are left open, do not disconnect any connected pull-down resistors) when POC
is released due to supply voltage startup.
12
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
2. DIFFERENCES BETWEEN µPD67A, 67B, 68A, 68B, AND µPD6P8, 6P8A, 6P8B
Table 2-1 shows the differences between the µPD67A, 67B, 68A, 68B, and µPD6P8, 6P8A, 6P8B.
The only differences between these models are the program memory, RAM retention detection voltage, internal
oscillator, POC detection voltage, and supply voltage; the other CPU functions and internal peripheral hardware
are the same.
The electrical specifications also differ slightly. For the electrical specifications, refer to the data sheet of each
model.
Table 2-1. Differences Between µPD67A, 67B, 68A, 68B, and µPD6P8, 6P8A, 6P8B
Item
ROM
µPD6P8
µPD6P8A
µPD6P8B
µPD67A
One-time PROM
Mask ROM
2026 × 10 bits
1002 × 10 bits
V POC = 1.8 V
POC detection voltage
VPOC = 1.85 V
(TYP.)
RAM retention
detection voltage
Internal oscillator
VID = 1.8 V
(TYP.)
–
µPD67B
µPD68A
µPD68B
2026 × 10 bits
VPOC = 1.5 V
VPOC = 1.85 V
VPOC = 1.5 V
(TYP.)
(TYP.)
(TYP.)
(TYP.)
VID = 1.6 V
VID = 1.4 V
V ID = 1.5 V
VID = 1.4 V
V ID = 1.5 V
(TYP.)
(TYP.)
(TYP.)
(TYP.)
(TYP.)
VDD = 2.0 to 3.6 V
VDD = 1.65 to 3.6 V
fX = 4 MHz
–
(TYP.)
Supply voltage
VDD = 1.9 to 3.6 V
VDD = 2.0 to 3.6 V
VDD = 1.65 to 3.6 V
Electrical specifications Some electrical specifications, such as data retention voltage and current consumption, differ.
Refer to data sheet of each model for details.
Data Sheet U17848EJ3V0DS
13
µPD6P8, 6P8A, 6P8B
3. INTERNAL CPU FUNCTIONS
3.1 Program Counter (PC): 11 Bits
The program counter (PC) is a binary counter that holds the address information of the program memory.
Figure 3-1. Program Counter Configuration
PC
PC10
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
The PC contains the address of the instruction that should be executed next. Normally, the counter contents
are automatically incremented in accordance with the instruction length (byte count) each time an instruction is
executed.
However, when executing jump instructions (JMP, JC, JNC, JF, JNF), the PC contains the jump destination
address written in the operand.
When executing the subroutine call instruction (CALL), the call destination address written in the operand is
entered in the PC after the PC contents at the time are saved in the address stack register (ASR). If the return
instruction (RET) is executed after the CALL instruction is executed, the address saved in the ASR is restored to
the PC.
After reset, the value of the PC becomes “000H”.
3.2 Stack Pointer (SP): 1 Bit
This is a 1-bit register that holds the status of the address stack register.
The stack pointer contents are incremented when the call instruction (CALL) is executed and decremented when
the return instruction (RET) is executed.
When reset, the stack pointer contents are cleared to 0.
When the stack pointer overflows (stack level 2 or more) or underflows, the CPU is defined as hung up, a system
reset signal is generated, and the PC becomes 000H.
As no instruction is available to set a value directly for the stack pointer, it is not possible to operate the pointer
by means of a program.
3.3 Address Stack Register (ASR (RF)): 11 Bits
The address stack register saves the return address of the program after a subroutine call instruction is executed.
The lower 8 bits are allocated in RF of the data memory as a alternate-function RAM. The register holds the
ASR value even after the RET instruction is executed.
After reset, it holds the previous data (undefined when turning on the power).
Caution If RF is accessed as the data memory, the higher 4 bits become undefined.
Figure 3-2. Address Stack Register Configuration
RF
ASR
14
ASR10
ASR9
ASR8
ASR7
ASR6
ASR5
Data Sheet U17848EJ3V0DS
ASR4
ASR3
ASR2
ASR1
ASR0
µPD6P8, 6P8A, 6P8B
3.4 Program Memory (One-Time PROM): 2,026 Steps × 10 Bits
The one-time PROM consists of 10 bits per step, and is addressed by the program counter.
The program memory stores programs and table data, etc.
The 22 steps from FEAH to FFFH cannot be used in the test program area.
Figure 3-3.
Program Memory Map
10 bits
0 0 0H
Page 0
3 F FH
4 0 0H
Page 1
7E9H
7 EAH
Test program areaNote
7 F FH
Note The test program area is designed so that a program or data placed in either of them by mistake is returned
to the 000H address.
Data Sheet U17848EJ3V0DS
15
µPD6P8, 6P8A, 6P8B
3.5 Data Memory (RAM): 32 × 4 Bits
The data memory, which is a static RAM consisting of 32 × 4 bits, is used to retain processed data. The data
memory is sometimes processed in 8-bit units. R0 can be used as the ROM data pointer.
RF is also used as the ASR.
After reset, R0 is cleared to 00H and R1 to RF retain the previous data (undefined when turning on the power).
Figure 3-4. Data Memory Configuration
R1n (higher 4 bits) R0n (lower 4 bits)
Note 1
R0
R10
R00
R1
R11
R01
R2
R12
R02
R3
R13
R03
R4
R14
R04
R5
R15
R05
R6
R16
R06
R7
R17
R07
R8
R18
R08
R9
R19
R09
RA
R1A
R0A
RB
R1B
R0B
RC
R1C
R0C
RD
R1D
R0D
RE
R1E
R0E
Note 2
RF
R1F
R0F
Notes 1. R0 alternately functions as the ROM data pointer (refer to 3.6 Data Pointer (DP)).
2. RF alternately functions as the PC address stack (refer to 3.3 Address Stack Register (ASR (RF)).
16
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
3.6 Data Pointer (DP): 12 Bits
The ROM data table can be referenced by setting the ROM address in the data pointer to call the ROM contents.
The lower 8 bits of the ROM address are specified by R0 of the data memory; and the higher 4 bits by bits 4
to 7 of the P3 register (CR0).
After reset, the pointer contents become 000H.
Figure 3-5. Data Pointer Configuration
P3 register
P3
b7
b6
b5
b4
0
DP10
DP9
DP8
R10
DP7
DP6
R00
DP5
DP4
DP3
DP2
DP1
DP0
R0
3.7 Accumulator (A): 4 Bits
The accumulator, which refers to a register consisting of 4 bits, plays a leading role in performing various
operations.
After reset, the accumulator contents are left undefined.
Figure 3-6. Accumulator Configuration
A3
A2
A1
A0
A
3.8 Arithmetic and Logic Unit (ALU): 4 Bits
The arithmetic and logic unit (ALU), which refers to an arithmetic circuit consisting of 4 bits, executes simple
(mainly logical) operations.
Data Sheet U17848EJ3V0DS
17
µPD6P8, 6P8A, 6P8B
3.9 Flags
3.9.1 Status flag (F)
Pin and timer statuses can be checked by executing the STTS instruction to check the status flag.
The status flag is set (to 1) in the following cases.
• If the condition specified with the operand is met when the STTS instruction is executed
• When standby mode is released.
• When the release condition is met at the point of executing the HALT instruction. (In this case, the system
does not enter the standby mode.)
Conversely, the status flag is cleared (to 0) in the following cases:
• If the condition specified with the operand is not met when the STTS instruction is executed.
• When the status flag has been set (to 1), the HALT instruction executed, but the release condition is not met
at the point of executing the HALT instruction. (In this case, the system does not enter the standby mode.)
Table 3-1. Conditions for Status Flag (F) to Be Set by STTS Instruction
Operand Value of STTS Instruction
Condition for Status Flag (F) to Be Set
b3
b2
b1
b0
0
0
0
0
High level is input to at least one of KI pins.
0
1
1
High level is input to at least one of KI pins.
1
1
0
High level is input to at least one of KI pins.
1
0
1
The down counter of the timer is 0.
1
Either of the combinations
of b2, b 1, and b0 above.
[The following condition is added in addition to the above.]
High level is input to at least one of S0Note 1, S1Note 1, or S2Note 2 pins.
Notes 1. The S0 and S1 pins must be set to input mode (bit 2 and bit 0 of the P4 register are set to 0 and 1,
respectively).
2. The use of STOP mode release for the S2 pin must be enabled (bit 3 of the P4 register is set to 1).
3.9.2 Carry flag (CY)
The carry flag is set (to 1) in the following cases:
• If the ANL instruction or the XRL instruction is executed when bit 3 of the accumulator is 1 and bit 3 of the
operand is 1.
• If the RL instruction or the RLZ instruction is executed when bit 3 of the accumulator is 1.
• If the INC instruction or the SCAF instruction is executed when the value of the accumulator is 0FH.
The carry flag is cleared (to 0) in the following cases:
• If the ANL instruction or the XRL instruction is executed when at least either bit 3 of the accumulator or bit
3 of the operand is 0.
• If the RL instruction or the RLZ instruction is executed when bit 3 of the accumulator is 0.
• If the INC instruction or the SCAF instruction is executed when the value of the accumulator is other than 0FH.
• If the ORL instruction is executed.
• When data is written to the accumulator by the MOV instruction or the IN instruction.
18
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
4. PORT REGISTERS (PX)
The KI/O port, the KI port, the special ports (S0, S1/LED, S2), and the control registers are treated as port registers.
After reset, the port register values are as shown below.
Figure 4-1. Port Register Configuration
Port register
After reset
P0
FFH
P10
KI/O7
P00
KI/O5
KI/O6
KI/O4
KI/O3
KI/O2
KI/O1
KI/O0
××××11×1BNote 1
P1
P11
KI3
KI2
P01
KI1
KI0
S1/LED
S0
S2
1
0000×000BNote 2
P3 (control register 0)
P13
DP11
DP10
P03
DP9
DP8
RAM
retention
flag
–
–
–
P4 (control register 1)
P14
0
26H
P04
S0/S1
KI
S2
S1/LED mode KI/O mode
Pull-down Pull-down STOP release
0
S0 mode
Notes 1. ×: Refers to the value based on the KI and S2 pin state.
2. ×: Refers to the value based on decrease of power supply voltage (0 when VDD ≤ VID)
Remark VID: RAM retention detection voltage
Table 4-1. Relationship Between Ports and Reading/Writing
Port Name
Input Mode
Read
Output Mode
Write
Read
Write
K I/O
Pin state
Output latch
Output latch
Output latch
KI
Pin state
—
S0
Pin state
—
Note
Pin state
S1/LED
Pin state
—
S2
Pin state
—
—
—
—
—
—
—
Note When in OFF mode, “1” is always read.
Data Sheet U17848EJ3V0DS
19
µPD6P8, 6P8A, 6P8B
4.1 K I/O Port (P0)
The KI/O port is an 8-bit I/O port for key scan output.
I/O mode is set by bit 1 of the P4 register.
If a read instruction is executed, the pin state can be read in input mode, whereas the output latch contents can
be read in output mode.
If a write instruction is executed, data can be written to the output latch regardless of input or output mode.
After reset, the port is placed in output mode and the value of the output latch (P0) becomes 1111 1111B.
The KI/O port incorporates a pull-down resistor, allowing pull-down in input mode only.
Caution When a key is double-pressed, a high-level output and a low-level output may conflict at the
KI/O port. To avoid this, the low-level output current of the KI/O port is held low. Therefore, be
careful when using the KI/O port for purposes other than key scan output.
The KI/O port is designed so that even when connected directly to VDD within the normal supply
voltage range (VDD = 1.9 to 3.6 V), no problem occurs.
Table 4-2. KI/O Port (P0)
Bit
b7
b6
b5
b4
b3
b2
b1
b0
Name
KI/O7
KI/O6
KI/O5
KI/O4
KI/O3
KI/O2
KI/O1
KI/O0
b0 to b7: When reading:
In input mode, the KI/O pin’s state is read.
In output mode, the KI/O pin’s output latch contents are read.
When writing:
Data is written to the KI/O pin’s output latch regardless of input or output mode.
4.2 K I Port/Special Ports (P1)
4.2.1 K I port (P 11 : bits 4 to 7 of P1)
The KI port is a 4-bit input port for key input. The pin state can be read.
The use of a pull-down resistor for the KI port can be specified in 4-bit units by software using bit 5 of the P4
register. After reset, a pull-down resistor is connected.
Table 4-3. KI/Special Port Register (P1)
Bit
b7
b6
b5
b4
b3
b2
b1
Name
KI3
KI2
KI1
KI0
S1/LED
S0
S2
b 1:
The state of the S2 pin is read (read only).
b 2:
In input mode, state of the S0 pin is read (read only).
b0
Fixed to “1”
In OFF mode, this bit is fixed to 1.
b 3:
The state of the S1/LED pin is read regardless of input/output mode (read only).
b4 to b7: The state of the KI pin is read (read only).
Caution In order to prevent malfunction, be sure to input a low level to one or more of pins KI0 to KI3
when POC is released by supply voltage rising (Can be left open. When open, leave the pulldown resistor connected).
20
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
4.2.2 S 0 port (bit 2 of P1)
The S0 port is an input/OFF mode port.
The pin state can be read by setting this port to input mode using bit 0 of the P4 register.
In input mode, the use of a pull-down resistor for the S0 and S1/LED port can be specified in 2-bit units by software
using bit 4 of the P4 register.
If input mode is released (thus set to OFF mode), the pin becomes high-impedance but is configured so that
through current does not flow internally. In OFF mode, 1 can be read regardless of the pin state.
After reset, S0 is set to OFF mode, thus becoming high-impedance.
4.2.3 S 1/LED port (bit 3 of P1)
The S1/LED port is an I/O port.
Input or output mode can be set using bit 2 of the P4 resister. The pin state can be read in both input mode
and output mode.
When in input mode, the use of a pull-down resistor for the S 0 and S 1/LED ports can be specified in 2-bit units
by software using bit 4 of the P4 register.
When in output mode, the pull-down resistor is automatically disconnected and this pin becomes the remote
control transmission display pin (refer to 5 TIMER).
After reset, S1/LED is placed in output mode, and a high level is output.
4.2.4 S 2 port (bit 1 of P1)
The S2 port is an input port.
Use of STOP mode release for the S2 port can be specified by bit 3 of the P4 register.
When using the pin as a key input from a key matrix, enable (bit 3 of the P4 register is set to 1) the use of STOP
mode release (at this time, a pull-down resistor is connected internally.) When STOP mode release is disabled
(bit 3 of the P4 register is set to 0), it can be used as an input port that does not release the STOP mode even if
the release condition is met (at this time, a pull-down resistor is not connected internally.)
The state of the pin can be read in both cases.
After reset, S2 is set to input mode where the STOP mode release is disabled, and enters a high-impedance
state.
Data Sheet U17848EJ3V0DS
21
µPD6P8, 6P8A, 6P8B
4.3 Control Register 0 (P3)
Control register 0 consists of 8 bits. The contents that can be controlled are as shown below.
After reset, the register becomes 0000 ×000BNote.
Note ×: Refers to the value based on a decrease of power supply voltage (0 when VDD ≤ VID)
Remark VID: RAM retention detection voltage
Table 4-4. Control Register 0 (P3)
b7Note
Bit
DP11
DP10
DP9
DP8
b3
RAM
retention
flag
0
0
0
0
0
Not retainable Fixed to 0
1
1
1
1
1
Retainable
0
0
0
0
0
Name
Setting
After reset
b 3:
b6
b5
b4
DP (Data Pointer)
b2
b0
—
0
0
0
RAM retention flag. For function details, refer to 4.3.1 RAM retention flag (bit 3 of P3).
b4 to b7: Specify the higher bits of the ROM data pointer (DP8 to DP11).
Note Set b7 to 0 in the case of the µPD6P8, 6P8A, 6P8B.
22
b1
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
4.3.1 RAM retention flag (bit 3 of P3)
The RAM retention flag indicates whether the supply voltage has fallen below the level at which the contents
of the RAM are lost while the battery is being exchanged or when the battery voltage has dropped.
This flag is at bit 3 of control register 0 (P3).
It is cleared to 0 if the supply voltage drops below the RAM retention detection voltage. If this flag is 0, it can
be judged that the RAM contents have been lost or that power has just been applied. This flag can be used to initialize
the RAM via software. After initializing the RAM and writing the necessary data to it, set this RAM retention flag
to 1 by software. At this time, 1 means that data has been set to the RAM.
Figure 4-2. Supply Voltage Transition and Detection Voltage (µPD6P8)
VDD
VPOC/VID
POC detection voltage/
RAM retention detection voltage
VPOC = VID = 1.8 V (TYP.)
(A)
0V
t
(1)
(2)
(3)
(4)
RAM retention flag
Set to 1
Flag contents
are read
(1) If the supply voltage rises after the battery has been set, and exceeds VPOC (POC detection voltage),
reset is cleared. Because the supply voltage rises from 0 V, which is lower than VID (RAM retention
detection voltage), the RAM retention flag remains in the initial status 0.
(2) The supply voltage has now risen to the level at which the device can operate. Write the necessary data
to the RAM and set the RAM retention flag to 1.
(3) The device is reset if the supply voltage drops below VPOC. At point (A) in the figure, the voltage is lower
than V ID. Consequently, the RAM retention flag is cleared to 0.
(4) If the RAM retention flag is checked by software after reset has been cleared, it is 0. This means that
the contents of the RAM may have been lost. If this case, initialize the RAM by software.
Cautions 1. The software developed for the µPD67A, 68A and 69A (using the RAM retention flag) can
be used for the µPD6P8 as is.
2. Unlike the µPD67A, 68A and 69A, the RAM retention detection voltage of the µPD6P8 is the
same as the POC detection voltage. When software is newly developed, it is not necessary
to use the RAM retention flag if only the RAM is initialized by reset.
Data Sheet U17848EJ3V0DS
23
µPD6P8, 6P8A, 6P8B
Figure 4-3. Supply Voltage Transition and Detection Voltage (µPD6P8A, 6P8B)
VDD
POC detection voltage
(Refer to 8. POC CIRCUIT)
VPOC = 1.8 V (TYP.)
RAM retention detection voltage
VID = 1.6 V (TYP.)
VPOC
(A)
VID
(B)
0V
t
(1)
(2)
(3)
(4)
(5)
(6)
RAM retention flag
Set to 1
Flag contents
are read
Flag contents
are read
(1) If the supply voltage rises after the battery has been set, and exceeds V POC (POC detection voltage),
reset is cleared. Because the supply voltage rises from 0 V, which is lower than VID (RAM retention
detection voltage), the RAM retention flag remains in the initial status 0.
(2) The supply voltage has now risen to the level at which the device can operate. Write the necessary data
to the RAM and set the RAM retention flag to 1.
(3) The device is reset if the supply voltage drops below V POC. At point (A) in the above figure, the RAM
retention flag remains 1 because the supply voltage is higher than V ID at this point.
(4) If the RAM retention flag is checked by software after reset has been cleared, it is 1. This means that
the contents of the RAM have not been lost. It is therefore not necessary to initialize the RAM by
software.
(5) The device is reset if the supply voltage drops below VPOC. At point (B) in the figure, the voltage is lower
than V ID. Consequently, the RAM retention flag is cleared to 0.
(6) If the RAM retention flag is checked by software after reset has been cleared, it is 0. This means that
the contents of the RAM may have been lost. If this case, initialize the RAM by software.
24
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
4.4 Control Register 1 (P4)
Control register 1 consists of 8 bits. The contents that can be controlled are as shown below.
After reset, the register becomes 0010 0110B.
Table 4-5. Control Register 1 (P4)
Bit
b7
Name
b6
b5
b4
KI
S0/S1
—
—
0
Fixed
Fixed
1
to 0
to 0
ON
ON
0
0
1
0
b3
S2
b2
b1
b0
S1/LED
KI/O
S0
Pull-down Pull-down STOP release mode
Setting
After reset
OFF
OFF
mode
mode
S1
IN
OFF
Enable
LED
OUT
IN
0
1
1
0
Disable
b0: Specifies the input mode of the S0 port. 0 = OFF mode (high impedance); 1 = IN (input mode).
b1: Specifies the I/O mode of the KI/O port.
0 = IN (input mode); 1 = OUT (output mode).
b2: Specifies the I/O mode of the S1/LED port. 0 = S1 (input mode); 1 = LED (output mode).
b3: Specified the use of STOP mode release by S2 port (with/without pull-down resistor). 0 = disable (without
pull-down); 1 = enable (with pull-down).
b4: Specifies the use of a pull-down resistor in S0/S1 port input mode. 0 = OFF (not used);
1 = ON (used)
b5: Specifies the use of a pull-down resistor for the KI port. 0 = OFF (not used);
1 = ON (used).
Remark In output mode or in OFF mode, all the pull-down resistors are automatically disconnected.
Data Sheet U17848EJ3V0DS
25
µPD6P8, 6P8A, 6P8B
5. TIMER
5.1 Timer Configuration
The timer is the block used for creating a remote control transmission pattern. As shown in Figure 4-1, it consists
of a 9-bit down counter (t8 to t0), a flag (t9) permitting the 1-bit timer output, and a zero detector.
Figure 5-1. Timer Configuration
T
T1
t9
t8
T0
t7
t6
t5
t4
t3
t2
9-bit down counter
Zero detector
Carrier
synchronous
circuit
26
t0
fX/64
Timer operation end signal
(HALT # 101B release
signal)
S1/LED
REM
t1
Count
clock
Carrier signal
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
5.2 Timer Operation
The timer starts (counting down) when a value other than 0 is set for the down counter with a timer manipulation
instruction. The timer manipulation instructions for making the timer start operation are shown below:
MOV T0, A
MOV T1, A
MOV T, #data10
MOV T, @R0
The down counter is decremented (–1) in the cycle of 64/fX. If the value of the down counter becomes 0, the
zero detector generates the timer operation end signal to stop the timer operation. At this time, if the timer is in
HALT mode (HALT #×101B) waiting for the timer to stop its operation, the HALT mode is released and the instruction
following the HALT instruction is executed. The output of the timer operation end signal is continued while the down
counter is 0 and the timer is stopped. The following relational expression applies between the timer’s output time
and the down counter’s set value.
Timer output time = (Set value + 1) × 64/f X – 4/f X
In addition, when the timer is set successively, the timer output time is also 4/fX shorter than the total time. An
example is shown below.
Example
When fX = 4 MHz
MOV T, #3FFH
STTS #05H
HALT #05H
MOV T, #232H
STTS #05H
HALT #05H
In the case above, the timer output time is as follows.
(Set value + 1) × 64/f X + (Set value + 1) × 64/f X – 4/f X
= (511 + 1) × 64/4 + (50 + 1) × 64/4 – 4/4
= 9.007 ms
Data Sheet U17848EJ3V0DS
27
µPD6P8, 6P8A, 6P8B
By setting the flag (t9) that enables the timer output to 1, the timer can output its operation status from the S1/
LED pin and the REM pin. The REM pin can also output the carrier while the timer is in operation.
Table 5-1. Timer Output (at t9 = 1)
S1/LED Pin
REM Pin
Timer operating
Low level
High level (or carrier outputNote)
Timer halting
High level
Low level
Note The carrier output results if bit 9 (CARY) of the high-level period setting modulo register (MOD1) is cleared
(to 0).
Figure 5-2. Timer Output (When Carrier Is Not Output)
4/fX
Timer output time:
(Set value + 1) × 64/fX — 4/fX
LED
REM
28
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
5.3 Carrier Output
5.3.1 Carrier output generator
The carrier generator consists of a 9-bit counter and two modulo registers for setting the high- and low-level
periods (MOD1 and MOD0 respectively).
Figure 5-3. Configuration of Remote Controller Carrier Generator
M1
M11
M0
M10
M01
t9 t8 t7 t6 t5 t4 t3 t2 t1 t0
CARY Modulo register for setting the high-level period (MOD1)
Carrier signal
0
t8 t7 t6
M00
t5 t 4 t 3 t 2 t 1 t 0
Modulo register for setting the low-level period (MOD0)Note 1
Selector
F/F
Match
Comparator
9-bit counter
2fX
Multiplier
fX
Clear
t9Note 2
fX
Notes 1. Bit 9 of the modulo register for setting the low-level period (MOD0) is fixed to 0.
2. t9: Flag that enables timer output (timer block) (see Figure 5-1 Timer Configuration)
The carrier duty ratio and carrier frequency can be determined by setting the high- and low-level widths using
the respective modulo registers. Each of these widths can be set in a range of 250 ns to 64 µs (@ fX = 4 MHz).
The system clock multiplied by 2 is used for the 9-bit counter input (8 MHz when fX = 4 MHz). MOD0 and MOD1
are read and written using timer manipulation instructions.
MOV A, M00
MOV M00, A
MOV M0, #data10
MOV A, M01
MOV M01, A
MOV M1, #data10
MOV A, M10
MOV M10, A
MOV M0, @R0
MOV A, M11
MOV M11, A
MOV M1, @R0
The values of MOD0 and MOD1 can be calculated from the following expressions.
MOD0 = (2 × fX × (1 – D) × T) – 1
MOD1 = (2 × fX × D × T) – 1
Caution Be sure to input values in range of 001H to 1FFH to MOD0 and MOD1.
Remark D: Carrier duty ratio (0 < D < 1)
fX: Input clock (MHz)
T: Carrier cycle (µs)
Data Sheet U17848EJ3V0DS
29
µPD6P8, 6P8A, 6P8B
5.3.2 Carrier output control
Remote controller carrier can be output from the REM pin by clearing (0) bit 9 (CARY) of the modulo register
for setting the high-level period (MOD1).
When performing carrier output, be sure to set the timer operation after setting the MOD0 and MOD1 values.
Note that a malfunction may occur if the values of MOD0 and MOD1 are changed while carrier is being output from
the REM pin.
Executing the timer manipulation instruction starts the carrier output from the low level.
If the timer’s down counter reaches 0 during carrier output, carrier output is stopped and the REM pin becomes
low level. If the down counter reaches 0 while the carrier output is high level, carrier output will stop after first
becoming low level following the set period of high level.
Figure 5-4. Timer Output (When Carrier Is Output)
Timer manipulation instruction
Timer output time: (Set value + 1) × 64/fX – 4/fX
LED
REM
4/fX
tL
tH
Note
Note If the down counter reaches 0 while the carrier output is high level, carrier output will stop after becoming
low level.
30
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
Output from the REM pin is as follows, in accordance with the values set to bit 9 (CARY) of MOD1 and the timer
output enable flag (t9), and the value of the timer block’s 9-bit down counter (t0 to t8).
Table 5-2. REM Pin Output
MOD1 Bit 9 (CARY)
Timer Output Enable Flag
(Timer Block t9)
9-Bit Down Counter
(Timer Block t0 to t8)
REM Pin
—
—
—
0
Low-level output
0
Other than 0
0
1
Carrier outputNote
1
High-level output
Note Input values in the range of 001H to 1FFH to MOD0 and MOD1.
Caution MOD0 and MOD1 must be set while the REM pin is low level (t9 = 0 or t0 to t8 = 0).
Table 5-3. Example of Carrier Frequency Settings (fX = 4 MHz)
Setting Value
MOD1
tH (µs)
tL (µs)
T (µs)
fC (kHz)
Duty
MOD0
01H
01H
0.25
0.25
0.5
2,000
1/2
07H
0BH
1.0
1.5
2.5
400
2/5
13H
13H
2.5
2.5
5.0
200
1/2
27H
27H
5.0
5.0
10
100
1/2
41H
41H
8.25
8.25
16.5
60.6
1/2
41H
85H
8.25
16.75
25
40
1/3
45H
89H
8.75
17.25
26.0
38.5
1/3
45H
8BH
8.75
17.5
26.25
38.10
1/3
45H
8CH
8.75
17.625
26.375
37.9
1/3
47H
91H
9.0
18.25
27.25
36.7
1/3
48H
94H
9.125
18.625
27.75
36.0
1/3
69H
D5H
13.25
26.75
40.0
25
1/3
77H
77H
15.0
15.0
30.0
33.3
1/2
C7H
C7H
25.0
25.0
50.0
20
1/2
FFH
FFH
32.0
32.0
64.0
15.6
1/2
tH
tL
Carrier signal
T
Data Sheet U17848EJ3V0DS
31
µPD6P8, 6P8A, 6P8B
5.4 Software Control of Timer Output
The timer output can be controlled by software. As shown in Figure 4-5, a pulse with a minimum width of 64/f X
- 4/fX can be output.
Figure 5-5. Output of Pulse of 1-Instruction Cycle Width
.
.
.
MOV T, #0000000000B; low-level output from the REM pin
.
.
.
MOV T, #1000000000B; high-level output from the REM pin
MOV T, #0000000000B; low-level output from the REM pin
.
.
.
4/fX 64/fX – 4/fX
LED
REM
32
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
6. STANDBY FUNCTION
6.1 Outline of Standby Function
To save current consumption, two types of standby modes, i.e., HALT mode and STOP mode, have been provided
available.
In STOP mode, the system clock stops oscillation. At this time, the XIN and XOUT pins are fixed to a low level.
In HALT mode, CPU operation halts, while the system clock continues oscillation. When in HALT mode, the
timer (including REM output and LED output) operates.
In either STOP mode or HALT mode, the statuses of the data memory, accumulator, and port registers, etc.
immediately before the standby mode is set are retained. Therefore, make sure to set the port status for the system
so that the current consumption of the whole system is suppressed before the standby mode is set.
Table 6-1. Statuses During Standby Mode
STOP Mode
Setting instruction
HALT instruction
Clock oscillator
Oscillation stopped
CPU
• Operation halted
Data memory
• Immediately preceding status retained
Operation
Accumulator
statuses
Flag
Oscillation continued
• Immediately preceding status retained
F
CY
Port register
Timer
HALT Mode
• 0 (When 1, the flag is not placed in the standby mode.)
• Immediately preceding status retained
• Immediately preceding status retained
• Operation halted
• Operable
(The count value is reset to “0”)
Cautions 1. Write the NOP instruction as the first instruction after STOP mode is released.
2. When standby mode is released, the status flag (F) is set (to 1).
3. If, at the point the standby mode has been set, its release condition is met, then the system
does not enter the standby mode. However, the status flag (F) is set (1).
Data Sheet U17848EJ3V0DS
33
µPD6P8, 6P8A, 6P8B
6.2 Standby Mode Setting and Release
The standby mode is set with the HALT #b3b2b1b0B instruction for both STOP mode and HALT mode. For the
standby mode to be set, the status flag (F) is required to have been cleared (to 0).
The standby mode is released by the release condition specified with the reset (POC) or the operand of HALT
instruction. If the standby mode is released, the status flag (F) is set (to 1).
Even when the HALT instruction is executed in the state that the status flag (F) has been set (to 1), the standby
mode is not set. If the release condition is not met at this time, the status flag is cleared (to 0). If the release condition
is met, the status flag remains set (to 1).
Even in the case when the release condition has been already met at the point that the HALT instruction is
executed, the standby mode is not set. Here, also, the status flag (F) is set (to 1).
Caution Depending on the status of the status flag (F), the HALT instruction may not be executed. Be
careful about this. For example, when setting HALT mode after checking the key status with
the STTS instruction, the system does not enter HALT mode as long as the status flag (F)
remains set (to 1) and thus sometimes performs an unintended operation. In this case, the
intended operation can be realized by executing the STTS instruction immediately after setting
the timer to clear (to 0) the status flag.
STTS
#03H
;To check the KI pin status.
MOV
T, #0xxH
;To set the timer
STTS
#05H
;To clear the status flag
…
…
Example
HALT
(During this time, be sure not to execute an instruction that may set the status flag.)
#05H
;To set HALT mode
Table 6-2. Addresses Executed After Standby Mode Release
Release Condition
34
Address Executed After Release
Reset
Address 0
Release condition shown in Table 5-3
The address following the HALT instruction
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
Table 6-3. Standby Mode Setup (HALT #b3b2b1b0B) and Release Conditions
Operand Value of
HALT Instruction
Setting Mode
Precondition for Setup
Release Condition
b3
b2
b1
b0
0
0
0
0
STOP
All KI/O pins are high-level output.
High level is input to at least one
of KI pins.
0
1
1
STOP
All KI/O pins are high-level output.
High level is input to at least one
of KI pins.
1
1
0
STOPNote 1
The KI/O0 pin is high-level output.
High level is input to at least one
of KI pins.
1
Any of the
STOP
[The following condition is added in addition to the above.]
combinations of
—
of S0, S1 and S2 pinsNote 2.
b2b1b0 above
0/1
1
0
High level is input to at least one
1
HALT
—
When the timer’s down counter is 0
Notes 1. When setting HALT #×110B, configure a key matrix by using the KI/O0 pin and the KI pin so that the
standby mode can be released.
2. At least one of the S0, S1 and S2 pins (the pin used for releasing the standby mode) must be specified
as follows:
S0, S1 pins:
Input mode (specified by bits 0 and 2 of the P4 register)
S2 pin:
Use of STOP mode release enabled (specified by bit 3 of the P4 register)
Cautions 1. The internal reset takes effect when the HALT instruction is executed with an operand value
other than that above or when the precondition has not been satisfied when executing the
HALT instruction.
2. If STOP mode is set when the timer’s down counter is not 0 (timer operating), the system
is placed in STOP mode only after all the 10 bits of the timer’s down counter and the timer
output permit flag are cleared to 0.
3. Write the NOP instruction as the first instruction after STOP mode is released.
Data Sheet U17848EJ3V0DS
35
µPD6P8, 6P8A, 6P8B
6.3 Standby Mode Release Timing
(1) STOP mode release timing
Figure 6-1. STOP Mode Release by Release Condition
Wait
(52/fX + α)
HALT instruction
(STOP mode)
Standby
release signal
Operation
mode
STOP mode
Oscillation
Oscillation
stopped
HALT mode
Operation
mode
Oscillation
Clock
α : Oscillation growth time
Caution When a release condition is met in the STOP mode, the device is released from the STOP mode,
and goes into a wait state. At this time, if the release condition is not held, the device goes
into STOP mode again after the wait time has elapsed. Therefore, when releasing the STOP
mode, it is necessary to hold the release condition longer than the wait time.
(2) HALT mode release timing
Figure 6-2. HALT Mode Release by Release Condition
Standby
release signal
HALT instruction
(HALT mode)
Operation
mode
HALT mode
Oscillation
Clock
36
Data Sheet U17848EJ3V0DS
Operation mode
µPD6P8, 6P8A, 6P8B
7. RESET
A system reset is effected by the following causes:
• When the POC circuit has detected low power-supply voltage
• When the operand value is illegal or does not satisfy the precondition when the HALT instruction is executed
• When the accumulator is 0H when the RLZ instruction is executed
• When stack pointer overflows or underflows
Table 7-1. Hardware Statuses After Reset
• Reset by On-Chip POC Circuit During Operation • Reset by the On-Chip POC Circuit During
• Reset by Other FactorsNote 1
Standby Mode
Hardware
PC (11 bits)
000H
SP (1 bit)
0B
Data
R0 = DP
000H
memory
R1 to RF Undefined
Accumulator (A)
Undefined
Status flag (F)
0B
Carry flag (CY)
0B
Timer (10 bits)
Port register
000H
P0
FFH
P1
×××× 11×1BNote 2
Control register P3
P4
0000×000BNote 3
26H
Notes 1. The following resets are available.
• Reset when executing the HALT instruction (when the operand value is illegal or does not satisfy
the precondition)
• Reset when executing the RLZ instruction (when A = 0)
• Reset by stack pointer’s overflow or underflow
2. ×: Refers to the value by the KI or S2 pin status.
In order to prevent malfunction, be sure to input a low level to one or more of pins KI0 to KI3 when
POC is released by supply voltage rising (Can be left open. When open, leave the pull-down resistor
connected).
3. ×: Refers to the value based on a decrease of power supply voltage (0 when VDD ≤ VID).
Remark VID: RAM retention detection voltage
Data Sheet U17848EJ3V0DS
37
µPD6P8, 6P8A, 6P8B
8. POC CIRCUIT
The POC circuit monitors the power supply voltage and applies an internal reset to the microcontroller when the
battery is replaced.
Cautions 1. There are cases in which the POC circuit cannot detect a low power supply voltage of less
than 1 ms. Therefore, if the power supply voltage has become low for a period of less than
1 ms, the POC circuit may malfunction because it does not generate an internal reset signal.
2. Clock oscillation is stopped by the resonator due to low power supply voltage before the
POC circuit generates the internal reset signal. In this case, malfunction may result when
the power supply voltage is recovered after the oscillation is stopped.
This type of
phenomenon takes place because the POC circuit does not generate an internal reset signal
(because the power supply voltage recovers before the low power supply voltage is
detected) even though the clock has stopped. If, by any chance, a malfunction has taken
place, remove the battery for a short time and put it back. In most cases, normal operation
will be resumed.
3. In order to prevent malfunction, be sure to input a low level to one or more of pins KI0 to
KI3 when POC is released due to supply voltage rising (Can be left open. When open, leave
the pull-down resistor connected).
38
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
8.1 Functions of POC Circuit
The POC circuit has the following functions:
• Generates an internal reset signal when VDD ≤ VPOC.
• Cancels an internal reset signal when VDD > VPOC.
Here, VDD: power supply voltage, VPOC: POC detection voltage.
VDD
Operating ambient temperature TA = – 40 to + 85°C
3.6 V
Clock frequency fX = 3.5 to 4.5 MHz
1.9 V
←POC detection voltage VPOC = 1.8 V (TYP.)Note 3
VPOC
Approx. 1.7 V
0V
→t
Internal reset signal
Reset
↑
Note 1
Operation mode
↑ Reset
Note 2
Notes 1. Actually, oscillation stabilization wait time must elapse before the circuit is switched to operation mode.
The oscillation stabilization wait time is about 534/fX to 918/fX (when about 134 to 230 µs; @ fX = 4 MHz).
2. For the POC circuit to generate an internal reset signal when the power supply voltage has fallen,
it is necessary for the power supply voltage to be kept less than the VPOC for the period of 1 ms or
more. Therefore, in reality, there is the time lag of up to 1 ms until the reset takes effect.
3. The POC detection voltage (VPOC) varies between approximately 1.7 to 1.9 V; thus, the reset may
be canceled at a power supply voltage smaller than the guaranteed range (VDD = 1.9 to 3.6 V).
However, as long as the conditions for operating the POC circuit are met, the actual lowest operating
power supply voltage becomes lower than the POC detection voltage.
Therefore, there is no
malfunction occurring due to a shortage of power supply voltage. However, malfunction for such
reasons as the clock not oscillating due to low power supply voltage may occur (refer to Cautions
3 in 8 POC CIRCUIT).
8.2 Oscillation Check at Low Supply Voltage
A reliable reset operation can be expected of the POC circuit if it satisfies the condition that the clock can oscillate
even at low power supply voltage (the oscillation start voltage of the resonator being even lower than the POC
detection voltage). Whether this condition is met or not can be checked by measuring the oscillation status in a
product that actually includes a POC circuit, as follows.
<1> Connect a storage oscilloscope to the X OUT pin so that the oscillation status can be measured.
<2> Connect a power supply whose output voltage can be varied and then gradually raise the power supply
voltage V DD from 0 V (making sure to avoid V DD > 3.6V).
At first (during VDD < approx. 1.7 V), the XOUT pin is 0 V regardless of the VDD. However, at the point that VDD
reaches the POC detection voltage (VPOC = 1.8 V (TYP.)), the voltage of the XOUT pin jumps to about 0.5VDD. Maintain
this power supply voltage for a while to measure the waveform of the XOUT pin. If by any chance the oscillation
start voltage of the resonator is lower than the POC detection voltage, the growing oscillation of the XOUT pin can
be confirmed within several ms after the VDD has reached the VPOC.
Data Sheet U17848EJ3V0DS
39
µPD6P8, 6P8A, 6P8B
9. SYSTEM CLOCK OSCILLATOR (µPD6P8, 6P8A)
The system clock oscillator consists of oscillators for ceramic resonators (fX = 3.5 to 4.5 MHz).
Figure 9-1. System Clock
XOUT
XIN
GND
Ceramic resonator
The system clock oscillator stops oscillating when a reset is applied or in STOP mode.
Caution When using the system clock oscillator, wire as follows in the area enclosed by the broken lines
in the above figure to avoid an adverse effect from wiring capacitance.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines. Do not route the wiring near a signal line
through which a high fluctuating current flows.
• Always make the ground point of the oscillator capacitor the same potential as GND. Do not
ground the capacitor to a ground pattern through which a high current flows.
• Do not fetch signals from the oscillator.
40
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
10. INSTRUCTION SET
10.1 Machine Language Output by Assembler
The bit length of the machine language of this product is 10 bits per word. However, the machine language that
is output by the assembler is extended to 16 bits per word. As shown in the example below, the extension is made
by inserting 3-bit extended bits (111) in two locations.
Figure 10-1. Example of Assembler Output (10 Bits Extended to 16 Bits)
<1> In the case of “ANL A, @R0H”
1 1 1
1
1 0 1 0
1
1
1 0 1 0
1 1 1
Extended bits
0 0 0 0
1
0 0 0 0
= FAF0
1 0 0 0
= E6F8
Extended bits
<2> In the case of “OUT P0, #data8”
1 1 1
Extended bits
0
0 1 1 0
1
1 0 0 0
0
0 1 1 0
1 1 1
1
Extended bits
Data Sheet U17848EJ3V0DS
41
µPD6P8, 6P8A, 6P8B
10.2 Circuit Symbol Description
A:
42
Accumulator
ASR:
Address stack register
addr:
Program memory address
CY:
Carry flag
data4:
4-bit immediate data
data8:
8-bit immediate data
data10:
10-bit immediate data
F:
Status flag
M0:
Modulo register for setting the low-level period
M00:
Modulo register for setting the low-level period (lower 4 bits)
M01:
Modulo register for setting the low-level period (higher 4 bits)
M1:
Modulo register for setting the high-level period
M10:
Modulo register for setting the high-level period (lower 4 bits)
M11:
Modulo register for setting the high-level period (higher 4 bits)
PC:
Program Counter
Pn:
Port register pair (n = 0, 1, 3, 4)
P0n:
Port register (lower 4 bits)
P1n:
Port register (higher 4 bits)
ROMn:
Bit n of the program memory’s (n = 0 to 9)
Rn:
Register pair
R0n:
Data memory (General-purpose register; n = 0 to F)
R1n:
Data memory (General-purpose register; n = 0 to F)
SP:
Stack Pointer
T:
Timer register
T0:
Timer register (lower 4 bits)
T1:
Timer register (higher 4 bits)
(×):
Content addressed with ×
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
10.3 Mnemonic to/from Machine Language (Assembler Output) Contrast Table
Accumulator Operation Instructions
Instruction Code
Operand
1st Word
Operation
Instruction
Instruction
Length
Cycle
3rd Word
A, R0n
FBEn
(A) ← (A)
A, R1n
FAEn
CY ← A3 • Rmn3
A, @R0H
FAF0
(A) ← (A)
∨
ANL
2nd Word
∨
Mnemonic
(Rmn) m = 0, 1 n = 0 to F
1
1
((P13), (R0))7-4
CY ← A3 • ROM7
(A) ← (A)
FBF0
∨
A, @R0L
((P13), (R0))3-0
CY ← A3 • ROM3
FBF1
data4
(A) ← (A)
∨
A, #data4
data4
2
CY ← A3 • data43
ORL
A, R0n
FDEn
(A) ← (A) ∨ (Rmn) m = 0, 1 n = 0 to F
A, R1n
FCEn
CY ← 0
A, @R0H
FCF0
1
(A) ← (A) ∨ ((P13), (R0))7-4
CY ← 0
A, @R0L
(A) ← (A) ∨ ((P13), (R0))3-0
FDF0
CY ← 0
A, #data4
FDF1
data4
(A) ← (A) ∨ data4
2
CY ← 0
XRL
A, R0n
F5En
(A) ← (A) ∨ (Rmn) m = 0, 1 n = 0 to F
A, R1n
F4En
CY ← A3 • Rmn3
A, @R0H
F4F0
(A) ← (A) ∨ ((P13), (R0))7-4
1
CY ← A3 • ROM7
A, @R0L
(A) ← (A) ∨ ((P13), (R0))3-0
F5F0
CY ← A3 • ROM3
A, #data4
F5F1
data4
(A) ← (A) ∨ data4
2
CY ← A3 • data43
INC
A
F4F3
(A) ← (A) + 1
if (A) = 0
1
CY ← 1
else CY ← 1
RL
A
FCF3
(An+1) ← (An), (A0) ← (A3)
RLZ
A
FEF3
if A = 0
CY ← A3
reset
else (An+1) ← (An), (A 0) ← (A3)
CY ← A3
Data Sheet U17848EJ3V0DS
43
µPD6P8, 6P8A, 6P8B
I/O Instructions
IN
OUT
ANL
ORL
XRL
Mnemonic
Instruction Code
Operand
2nd Word
3rd Word
A, P0n
FFF8 + n
—
—
(A) ← (Pmn)
A, P1n
FEF8 + n
—
—
CY ← 0
(Pmn) ← (A)
Remark
m = 0, 1
n = 0, 1, 3, 4
m = 0, 1
n = 0, 1, 3, 4
P0n, A
E5F8 + n
—
—
P1n, A
E4F8 + n
—
—
A, P0n
FBF8 + n
—
—
(A) ← (A) (Pmn) m = 0, 1 n = 0, 1, 3, 4
A, P1n
FAF8 + n
—
—
CY ← A3 • Pmn3
A, P0n
FDF8 + n
—
—
(A) ← (A) ∨ (Pmn) m = 0, 1 n = 0, 1, 3, 4
A, P1n
FCF8 + n
—
—
CY ← 0
A, P0n
F5F8 + n
—
—
(A) ← (A) ∨ (Pmn) m = 0, 1 n = 0, 1, 3, 4
A, P1n
F4F8 + n
—
—
CY ← A3 • Pmn3
Instruction Code
Operand
1st Word
OUT
Operation
1st Word
Pn, #data8 E6F8 + n
2nd Word
Instruction
Instruction
Length
Cycle
1
1
Instruction
Instruction
∨
Mnemonic
Operation
3rd Word
Length
(Pn) ← data8
data8
n = 0, 1, 3, 4
2
Cycle
1
Pn: P1n to P0n are dealt with in pairs.
Data Transfer Instruction
Mnemonic
Instruction Code
Operand
1st Word
MOV
2nd Word
Operation
Instruction
Instruction
Length
Cycle
3rd Word
A, R0n
FFEn
(A) ← (Rmn)
A, R1n
FEEn
CY ← 0
A, @R0H
FEF0
(A) ← ((P13), (R0))7-4
m = 0, 1 n = 0 to F
1
1
CY ← 0
A, @R0L
(A) ← ((P13), (R0))3-0
FFF0
CY ← 0
Mnemonic
A, #data4
FFF1
R0n, A
E5En
R1n, A
E4En
Instruction Code
Operand
Remark
44
2
(Rmn) ← (A)
1st Word
MOV
(A) ← data4
CY ← 0
data4
2nd Word
m = 0, 1 n = 0 to F
Operation
Instruction
Instruction
Length
Cycle
3rd Word
Rn, #data8 E6En
data8
—
(R1n to R0n) ← data8
Rn, @R0
—
—
(R1n to R0n) ← ((P13), (R0))n = 1 to F
E7En
1
Rn: R1n to R0n are handled in pairs.
Data Sheet U17848EJ3V0DS
n = 0 to F
2
1
1
µPD6P8, 6P8A, 6P8B
Branch Instructions
Mnemonic
Instruction Code
Operand
1st Word
JMP
JC
JNC
JF
JNF
2nd Word
addr (Page 0) E8F1
addr
addr (Page 1) E9F1
addr
addr (Page 2) E8F4
addr
addr (Page 3) E9F4
addr
Operation
PC ← addr
if CY = 1
addr
else PC ← PC + 2
addr
addr
Cycle
1
PC ← addr
addr
addr (Page 1) EAF1
addr (Page 3) EAF4
Instruction
Length
2
addr (Page 0) ECF1
addr (Page 2) ECF4
Instruction
3rd Word
PC ← addr
addr (Page 0) EDF1
addr
if CY = 0
addr (Page 1) EBF1
addr
else PC ← PC + 2
addr (Page 2) EDF4
addr
addr (Page 3) EBF4
addr
addr (Page 0) EEF1
addr
if F = 1
addr (Page 1) F0F1
addr
else PC ← PC + 2
addr (Page 2) EEF4
addr
addr (Page 3) F0F4
addr
addr (Page 0) EFF1
addr
if F = 0
addr (Page 1) F1F1
addr
else PC ← PC + 2
addr (Page 2) EFF4
addr
addr (Page 3) F1F4
addr
PC ← addr
PC ← addr
Caution 0 and 4, which refer to PAGE0 and 4, are not written when describing mnemonics.
Subroutine Instructions
Mnemonic
Instruction Code
Operand
1st Word
CALL
RET
Operation
2nd Word
3rd Word
addr (Page 0) E6F2
E8F1
addr
addr (Page 1) E6F2
E9F1
addr
addr (Page 2) E6F2
E8F4
addr
addr (Page 3) E6F2
E9F4
addr
E8F2
Instruction
Instruction
Length
Cycle
SP ← SP + 1, ASR ← PC, PC ← addr
3
2
PC ← ASR, SP ← SP – 1
1
1
Caution 0 and 4, which refer to PAGE0 and 4, are not written when describing mnemonics.
Data Sheet U17848EJ3V0DS
45
µPD6P8, 6P8A, 6P8B
Timer Operation Instructions
Mnemonic
Instruction Code
Operand
1st Word
MOV
Mnemonic
MOV
2nd Word
Operation
A, T0
FFFF
(A) ← (Tn)
A, T1
FEFF
CY ← 0
A, M00
FFF6
(A) ← (M0n)
A, M01
FEF6
CY ← 0
A, M10
FFF7
(A) → (M1n)
A, M11
FEF7
CY → 0
T0, A
E5FF
(Tn) ← (A)
T1, A
F4FF
(T) n ← 0
M00, A
E5F6
(M0n) ← (A)
M01, A
E4F6
CY ← 0
M10, A
E5F7
(M1n) ← (A)
M11, A
E4F7
CY ← 0
n = 0, 1
Instruction
Length
Cycle
1
1
Instruction
Instruction
n = 0, 1
n = 0, 1
n = 0, 1
n = 0, 1
n = 0, 1
Instruction Code
Operand
Instruction
3rd Word
Operation
1st Word
2nd Word
T, #data10
E6FF
data10
3rd Word
(T) ← data10
Length
M0, #data10
E6F6
data10
(M0) ← data10
M1, #data10
E6F7
data10
(M1) ← data10
2
T, @R0
F4FF
(T) ← ((P13), (R0))
M0, @R0
E7F6
(M0) ← ((P13), (R0))
M1, @R0
E7F7
(M1) ← ((P13), (R0))
Cycle
1
1
Others
Mnemonic
Instruction Code
Operand
1st Word
2nd Word
HALT
#data4
E2F1
data4
Standby mode
STTS
#data4
E3F1
data4
if statuses match
3rd Word
E3En
FAF3
NOP
46
E0E0
F←1
F←1
F←0
if A = 0FH
else
2
F←0
if statuses match
else
SCAF
Instruction
Length
else
R0n
Instruction
Operation
1
n = 0 to F
CY ← 1
CY ← 0
PC ← PC + 1
Data Sheet U17848EJ3V0DS
Cycle
1
µPD6P8, 6P8A, 6P8B
10.4 Accumulator Manipulation Instructions
ANL A, R0n
ANL A, R1n
1 1 0 1 R4 0 R3 R2 R1 R0
<2> Cycle count:
1
<3> Function:
(A) ← (A)
∨
<1> Instruction code:
(Rmn)
m = 0, 1
n = 0 to F
CY ← A 3 • Rmn 3
The accumulator contents and the register Rmn contents are ANDed and the results are entered in the
accumulator.
ANL A, @R0H
ANL A, @R0L
<1> Instruction code:
1 1 0 1 0/1 1 0 0 0 0
<2> Cycle count:
1
<3> Function:
(A) ← (A)
((P13), (R0)) 7-4 (in the case of ANL A, @R0H)
∨
CY ← A 3 • ROM 7
(A) ← (A)
((P13), (R0)) 3-0 (in the case of ANL A, @R0L)
∨
CY ← A 3 • ROM 3
The accumulator contents and the program memory contents specified by the control register P13 and
register pair R10 to R00 are ANDed and the results are entered in the accumulator.
If H is specified, b7, b6, b5 and b4 take effect. If L is specified, b3, b2, b1 and b0 take effect.
• Program memory (ROM) organization
b7
b9
b6
b5
b4
b8
H↓
b3
b2
b1
b0
L↓
Valid bits at the time of accumulator manipulation
ANL A, #data4
<1> Instruction code:
1 1 0 1 1 1 0 0 0 1
<2> Cycle count:
1
<3> Function:
(A) ← (A)
0 0 0 0 0 0 d3 d2 d1 d0
data4
∨
CY ← A 3 • data4 3
The accumulator contents and the immediate data are ANDed and the results are entered in the
accumulator.
Data Sheet U17848EJ3V0DS
47
µPD6P8, 6P8A, 6P8B
ORL A, R0n
ORL A, R1n
<1> Instruction code:
1 1 1 0 R4 0 R3 R2 R1 R0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ (Rmn)
m = 0, 1
n = 0 to F
CY ← 0
The accumulator contents and the register Rmn contents are ORed and the results are entered in the
accumulator.
ORL A, @R0H
ORL A, @R0L
<1> Instruction code:
1 1 1 0 0/1 1 0 0 0 0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ (P13), (R0)) 7-4 (in the case of ORL A, @R0H)
(A) ← (A) ∨ (P13), (R0)) 3-0 (in the case of ORL A, @R0L)
CY ← 0
The accumulator contents and the program memory contents specified by the control register P13 and
register pair R10-R00 are ORed and the results are entered in the accumulator.
If H is specified, b7, b6, b5 and b4 take effect. If L is specified, b3, b2, b1 and b0 take effect.
ORL A, #data4
<1> Instruction code:
1 1 1 0 1 1 0 0 0 1
0 0 0 0 0 0 d3 d2 d1 d0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ data4
CY ← 0
The accumulator contents and the immediate data are exclusive-ORed and the results are entered in
the accumulator.
XRL A, R0n
XRL A, R1n
<1> Instruction code:
1 0 1 0 R4 0 R3 R2 R1 R0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ (Rmn)
m = 0, 1
n = 0 to F
CY ← A 3 • Rmn 3
The accumulator contents and the register Rmn contents are ORed and the results are entered in the
accumulator.
48
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
XRL A, @R0H
XRL A, @R0L
<1> Instruction code:
1 0 1 0 0/1 1 0 0 0 0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ (P13), (R0)) 7-4 (in the case of XRL A, @R0H)
CY ← A 3 • ROM 7
(A) ← (A) ∨ (P13), (R0)) 3-0 (in the case of XRL A, @R0L)
CY ← A 3 • ROM 3
The accumulator contents and the program memory contents specified by the control register P13 and
register pair R10-R00 are exclusive-ORed and the results are entered in the accumulator.
If H is specified, b7, b6, b5, and b4 take effect. If L is specified, b3, b2, b1, and b0 take effect.
XRL A, #data4
<1> Instruction code:
1 0 1 0 1 1 0 0 0 1
0 0 0 0 0 0 d3 d2 d1 d0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ data4
CY ← A 3 • data4 3
The accumulator contents and the immediate data are exclusive-ORed and the results are entered in
the accumulator.
INC A
<1> Instruction code:
1 0 1 0 0 1 0 0 1 1
<2> Cycle count:
1
<3> Function:
(A) ← (A) + 1
if
A = 0
else
CY ← 1
CY ← 0
The accumulator contents are incremented (+1).
RL A
<1> Instruction code:
1 1 1 0 0 1 0 0 1 1
<2> Cycle count:
1
<3> Function:
(A n + 1) ← (An), (A 0) ← (A 3)
CY ← A 3
The accumulator contents are rotated anticlockwise bit by bit.
RLZ A
<1> Instruction code:
1 1 1 1 0 1 0 0 1 1
<2> Cycle count:
1
<3> Function:
if
A = 0
else
reset
(A n + 1) ← (An), (A 0) ←(A 3)
CY ← A 3
The accumulator contents are rotated anticlockwise bit by bit.
If A = 0H at the time of command execution, an internal reset takes effect.
Data Sheet U17848EJ3V0DS
49
µPD6P8, 6P8A, 6P8B
10.5 I/O Instructions
IN A, P0n
IN A, P1n
<1> Instruction code:
1 1 1 1 P4 1 1 P2 P1 P0
<2> Cycle count:
1
<3> Function:
(A) ← (Pmn)
m = 0, 1
n = 0, 1, 3, 4
CY ← 0
The port Pmn data is loaded (read) onto the accumulator.
OUT P0n, A
OUT P1n, A
<1> Instruction code:
0 0 1 0 P4 1 1 P2 P1 P0
<2> Cycle count:
1
<3> Function:
(Pmn) ← (A)
m = 0, 1
n = 0, 1, 3, 4
The accumulator contents are transferred to port Pmn to be latched.
ANL A, P0n
ANL A, P1n
<1> Instruction code:
1 1 0 1 P4 1 1 P2 P1 P0
<2> Cycle count:
1
<3> Function:
(A) ← (A)
(Pmn)
m = 0, 1
n = 0, 1, 3, 4
∨
CY ← A 3 • Pmn
The accumulator contents and the port Pmn contents are ANDed and the results are entered in the
accumulator.
ORL A, P0n
ORL A, P1n
<1> Instruction code:
1 1 1 0 P4 1 1 P2 P1 P0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ (Pmn)
m = 0, 1
n = 0, 1, 3, 4
CY ← 0
The accumulator contents and the port Pmn contents are ORed and the results are entered in the
accumulator.
XRL A, P0n
XRL A, P1n
<1> Instruction code:
1 0 1 0 P4 1 1 P2 P1 P0
<2> Cycle count:
1
<3> Function:
(A) ← (A) ∨ (Pmn)
m = 0, 1
n = 0, 1, 3, 4
CY ← A 3 • Pmn
The accumulator contents and the port Pmn contents are exclusive-ORed and the results are entered
in the accumulator.
50
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
OUT Pn, #data8
<1> Instruction code:
0 0 1 1 0 1 1 P2 P1 P0
:
0 d7 d6 d5 d4 0 d3 d2 d1 d0
<2> Cycle count:
1
<3> Function:
(Pn) ← data8
n = 0, 1, 3, 4
The immediate data is transferred to port Pn. In this case, port Pn refers to P1n to P0n operating in pairs.
10.6 Data Transfer Instructions
MOV A, R0n
MOV A, R1n
<1> Instruction code:
1 1 1 1 R4 0 R3 R2 R1 R0
<2> Cycle count:
1
<3> Function:
(A) ← (Rmn)
m = 0, 1
n = 0 to F
CY ← 0
The register Rmn contents are transferred to the accumulator.
MOV A, @R0H
<1> Instruction code:
1 1 1 1 0 1 0 0 0 0
<2> Cycle count:
1
<3> Function:
(A) ← ((P13), (R0)) 7-4
CY ← 0
The higher 4 bits (b7 b6 b5 b4) of the program memory specified by control register P13 and register pair
R10-R00 are transferred to the accumulator. b9 is ignored.
MOV A, @R0L
<1> Instruction code:
1 1 1 1 1 1 0 0 0 0
<2> Cycle count:
1
<3> Function:
(A) ← ((P13), (R0)) 3-0
CY ← 0
The lower 4 bits (b3 b2 b1 b0) of the program memory specified by control register P13 and register pair
R10 to R00 are transferred to the accumulator. b8 is ignored.
• Program memory (ROM) contents
@R0 H
b9
b7
b6
b5
@R0 L
b4
b8
b3
b2
b1
b0
MOV A, #data4
<1> Instruction code:
:
1 1 1 1 1 1 0 0 0 1
0 0 0 0 0 0 d3 d2 d1 d0
<2> Cycle count:
1
<3> Function:
(A) ← data4
CY ← 0
The immediate data is transferred to the accumulator.
Data Sheet U17848EJ3V0DS
51
µPD6P8, 6P8A, 6P8B
MOV R0n, A
MOV R1n, A
<1> Instruction code:
0 0 1 0 R4 0 R3 R2 R1 R0
<2> Cycle count:
1
<3> Function:
(Rmn) ← (A)
m = 0, 1
n = 0 to F
The accumulator contents are transferred to register Rmn.
MOV Rn, #data8
<1> Instruction code:
:
0 0 1 1 0 0 R3 R2 R1 R0
0 d7 d6 d5 d4 0 d3 d2 d1 d0
<2> Cycle count:
1
<3> Function:
(R1n-R0n) ← data8
n = 0 to F
The immediate data is transferred to the register. Using this instruction, registers operate as register
pairs.
The pair combinations are as follows:
R0: R10 - R00
R1: R11 - R01
:
RE: R 1E - R0E
RF: R1F - R0F
Lower column
Higher column
MOV Rn, @R0
<1> Instruction code:
0 0 1 1 1 0 R3 R2 R1 R0
<2> Cycle count:
1
<3> Function:
(R1n-R0n) ← ((P13), R0))
n = 1 to F
The program memory contents specified by control register P13 and register pair R10 to R00 are
transferred to register pair R1n to R0n. The program memory consists of 10 bits and has the following
state after the transfer to the register.
Program memory
b9
b7
b6
b5
b4
b8
b3
b2
b1
b0
→
b9
@R0
b7
b6
b5
R1n
b4
b8
b3
b2
b1
b0
R0n
The higher 2 to 4 bits of the program memory address are specified by the control register (P13).
52
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
10.7 Branch Instructions
The program memory consists of pages in steps of 1K (000H to 3FFH). However, as the assembler automatically
performs page optimization, it is unnecessary to designate pages. The pages allowed for each product are as
follows.
µPD6P8, 6P8A, 6P8B (ROM: 2K steps): Pages 0, 1
JMP addr
<1> Instruction code:
Page 0
0 1 0 0 0 1 0 0 0 1
; page 1
0 1 0 0 1 1 0 0 0 1
Page 2
0 1 0 0 0 1 0 1 0 0
; page 3
0 1 0 0 1 1 0 1 0 0
a9 a7 a6 a5 a4 a8 a3 a2 a1 a0
<2> Cycle count:
1
<3> Function:
PC ← addr
The 10 bits (PC9-0) of the program counter are replaced directly by the specified address addr (a9 to
a0).
JC addr
<1> Instruction code:
Page 0
0 1 1 0 0 1 0 0 0 1
; page 1
0 1 0 1 0 1 0 0 0 1
Page 2
0 1 1 0 0 1 0 1 0 0
; page 3
0 1 0 1 0 1 0 1 0 0
a9 a7 a6 a5 a4 a8 a3 a2 a1 a0
<2> Cycle count:
1
<3> Function:
if
CY = 1
else
PC ← addr
PC ← PC + 2
If the carry flag CY is set (to 1), a jump is made to the address specified by addr (a9 to a0).
JNC addr
<1> Instruction code:
Page 0
0 1 1 0 1 1 0 0 0 1
; page 1
0 1 0 1 1 1 0 0 0 1
Page 2
0 1 1 0 1 1 0 1 0 0
; page 3
0 1 0 1 1 1 0 1 0 0
a9 a7 a6 a5 a4 a8 a3 a2 a1 a0
<2> Cycle count:
1
<3> Function:
if
CY = 0
else
PC ← addr
PC ← PC + 2
If the carry flag CY is cleared (to 0), a jump is made to the address specified by addr (a9 to a0).
JF addr
<1> Instruction code:
Page 0
0 1 1 1 0 1 0 0 0 1
; page 1
1 0 0 0 0 1 0 0 0 1
Page 2
0 1 1 1 0 1 0 1 0 0
; page 3
1 0 0 0 0 1 0 1 0 0
a9 a7 a6 a5 a4 a8 a3 a2 a1 a0
<2> Cycle count:
1
<3> Function:
if
F = 1
else
PC ← addr
PC ← PC + 2
If the status flag F is set (to 1), a jump is made to the address specified by addr (a9 to a0).
Data Sheet U17848EJ3V0DS
53
µPD6P8, 6P8A, 6P8B
JNF addr
<1> Instruction code:
Page 0
0 1 1 1 1 1 0 0 0 1
; page 1
1 0 0 0 1 1 0 0 0 1
Page 2
0 1 1 1 1 1 0 1 0 0
; page 3
1 0 0 0 1 1 0 1 0 0
a9 a7 a6 a5 a4 a8 a3 a2 a1 a0
<2> Cycle count:
1
<3> Function:
if
F = 0
else
PC ← addr
PC ← PC + 2
If the status flag F is cleared (to 0), a jump is made to the address specified by addr (a9 to a0).
10.8 Subroutine Instructions
The program memory consists of pages in steps of 1K (000H to 3FFH). However, as the assembler automatically
performs page optimization, it is unnecessary to designate pages. The pages allowed for each product are as
follows.
µPD6P8, 6P8A, 6P8B (ROM: 2K steps): Pages 0, 1
CALL addr
<1> Instruction code:
0 0 1 1 0 1 0 0 1 0
Page 0
0 1 0 0 0 1 0 0 0 1
; page 1
0 1 0 0 1 1 0 0 0 1
Page 2
0 1 0 0 0 1 0 1 0 0
; page 3
0 1 0 0 1 1 0 1 0 0
a9 a7 a6 a5 a4 a8 a3 a2 a1 a0
<2> Cycle count:
2
<3> Function:
SP ← SP + 1
ASR ← PC
PC ← addr
Increments (+1) the stack pointer value and saves the program counter value in the address stack
register. Then, enters the address specified by the operand addr (a9 to a0) into the program counter.
If a carry is generated when the stack pointer value is incremented (+1), an internal reset takes effect.
RET
<1> Instruction code:
0 1 0 0 0 1 0 0 1 0
<2> Cycle count:
1
<3> Function:
PC ← ASR
SP ← SP – 1
Restores the value saved in the address stack register to the program counter. Then, decrements
(–1) the stack pointer.
If a borrow is generated when the stack pointer value is decremented (–1), an internal reset takes effect.
54
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
10.9 Timer Operation Instructions
MOV A, T0
MOV A, T1
<1> Instruction code:
1
1 1 1 0/1 1 1 1 1 1
<2> Cycle count:
1
<3> Function:
(A) ← (Tn)
n = 0, 1
CY ← 0
The timer register Tn contents are transferred to the accumulator. T1 corresponds to (t9, t8, t7, t6); T0
corresponds to (t5, t4, t3, t2).
T
t9
t8
t7
t6
T1
t5
t4
t3
t2
t1
t0
T0
↓
MOV T, #data10
Can be set with
MOV T, @R0
MOV A, M00
MOV A, M01
<1> Instruction code:
1
<2> Cycle count:
1
<3> Function:
(A) ← (M0n)
1 1 1 0/1 1 0 1 1 0
n = 0, 1
CY ← 0
The modulo register M0n contents are transferred to the accumulator. M01 corresponds to (t9, t8, t7,
t6); M00 corresponds to (t5, t4, t3, t2).
M0
t9
t8
t7
M01
t6
t5
t4
t3
t2
t1
t0
M00
↓
MOV M0, #data10
Can be set with
MOV M0, @R0
Data Sheet U17848EJ3V0DS
55
µPD6P8, 6P8A, 6P8B
MOV A, M10
MOV A, M11
<1> Instruction code:
1
1 1 1 0/1 1 0 1 1 1
<2> Cycle count:
1
<3> Function:
(A) ← (M1n)
n = 0, 1
CY ← 0
The modulo register M1n contents are transferred to the accumulator. M11 corresponds to (t9, t8, t7,
t6); M10 corresponds to (t5, t4, t3, t2).
M1
t9
t8
t7
t6
M11
t5
t4
t3
t2
t1
t0
M10
↓
MOV M1, #data10
Can be set with
MOV M1, @R0
MOV T0, A
MOV T1, A
<1> Instruction code:
0
<2> Cycle count:
1
<3> Function:
(Tn) ← (A)
0 1 0 0/1 1 1 1 1 1
n = 0, 1
The accumulator contents are transferred to the timer register Tn. T1 corresponds to (t9, t8, t7, t6); T0
corresponds to (t5, t4, t3, t2). After executing this instruction, if data is transferred to T1, t1 becomes
0; if data is transferred to T0, t0 becomes 0.
MOV M00, A
MOV M01, A
<1> Instruction code:
0
0 1 0 0/1 1 0 1 1 0
<2> Cycle count:
1
<3> Function:
(M0n) ← (A)
n = 0, 1
CY ← 0
The accumulator contents are transferred to the modulo register M0n. M01 corresponds to (t9, t8, t7,
t6); M00 corresponds to (t5, t4, t3, t2). After executing this instruction, if data is transferred to M01,
t1 becomes 0; if data is transferred to M00, t0 becomes 0.
MOV M10, A
MOV M11, A
<1> Instruction code:
0
0 1 0 0/1 1 0 1 1 1
<2> Cycle count:
1
<3> Function:
(M1n) ← (A)
n = 0, 1
CY ← 0
The accumulator contents are transferred to the modulo register M1n. M11 corresponds to (t9, t8, t7,
t6); M10 corresponds to (t5, t4, t3, t2). After executing this instruction, if data is transferred to M11,
t1 becomes 0; if data is transferred to M10, t0 becomes 0.
56
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
MOV T, #data10
<1> Instruction code:
0 0 1 1 0 1 1 1 1 1
t1 t9 t8 t7 t6 t0 t5 t4 t3 t2
<2> Cycle count:
1
<3> Function:
(T) ← data10
The immediate data is transferred to the timer register T (t9 to t0).
Remark The timer time is set as follows.
(Set value + 1) × 64/fX – 4/fX
MOV M0, #data10
<1> Instruction code:
0 0 1 1 0 1 0 1 1 0
t1 t9 t8 t7 t6 t0 t5 t4 t3 t2
<2> Cycle count:
1
<3> Function:
(M0) ← data10
The immediate data is transferred to the modulo register M0 (t9 to t0).
MOV M1, #data10
<1> Instruction code:
0 0 1 1 0 1 0 1 1 1
<2> Cycle count:
1
<3> Function:
(M1) ← data10
t1 t9 t8 t7 t6 t0 t5 t4 t3 t2
The immediate data is transferred to the modulo register M1 (t9 to t0).
MOV T, @R0
<1> Instruction code:
0 0 1 1 1 1 1 1 1 1
<2> Cycle count:
1
<3> Function:
(T) ← ((P13), (R0))
Transfers the program memory contents to the timer register T (t9 to t0) specified by the control register
P13 and the register pair R10 to R00.
The program memory, which consists of 10 bits, is placed in the following state after the transfer to the
register.
Timer
T
Program memory
t1
t9
t8
t7
t6
t0
t5
t4
t3
t2
→
t9
t8
@R0
t7
T1
t6
t5
t4
t3
t2
t1
t0
T0
The higher 2 to 4 bits of the program memory address are specified by the control register (P13).
Caution When setting a timer value in the program memory, be sure to use the DT
quasi-directive.
Data Sheet U17848EJ3V0DS
57
µPD6P8, 6P8A, 6P8B
MOV M0, @R0
<1> Instruction code:
0 0 1 1 1 1 0 1 1 0
<2> Cycle count:
1
<3> Function:
(M0) ← ((P13), (R0))
Transfers the program memory contents to the modulo register M0 (t9 to t0) specified by the control
register P13 and the register pair R10 to R00.
The program memory, which consists of 10 bits, is placed in the following state after the transfer to the
register.
Modulo register
M0
Program memory
t1
t9
t8
t7
t6
t0
t5
t4
t3
t2
→
t9
@R0
t8
t7
t6
t5
M01
t4
t3
t2
t1
t0
M00
The higher 2 to 4 bits of the program memory address are specified by the control register (P13).
Caution When setting a timer value in the program memory, be sure to use the DT
quasi-directive.
MOV M1, @R0
<1> Instruction code:
0 0 1 1 1 1 0 1 1 1
<2> Cycle count:
1
<3> Function:
(M1) ← ((P13), (R0))
Transfers the program memory contents to the modulo register M1 (t9 to t0) specified by the control
register P13 and the register pair R10 to R00.
The program memory, which consists of 10 bits, is placed in the following state after the transfer to the
register.
Modulo register
M1
Program memory
t1
t9
t8
t7
t6
t0
t5
t4
t3
t2
@R0
→
t9
t8
t7
M11
t6
t5
t4
t3
t2
t1
t0
M10
The higher 2 to 4 bits of the program memory address are specified by the control register (P13).
Caution When setting a timer value in the program memory, be sure to use the DT
quasi-directive.
10.10 Others
HALT #data4
<1> Instruction code:
:
0 0 0 1 0 1 0 0 0 1
0 0 0 0 0 0 d3 d2 d1 d0
<2> Cycle count:
1
<3> Function:
Standby mode
Places the CPU in standby mode.
The condition for having the standby mode (HALT/STOP mode) canceled is specified by the immediate
data.
58
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
STTS R0n
<1> Instruction code:
0 0 0 1 1 0 R3 R2 R1 R0
<2> Cycle count:
1
<3> Function:
if statuses match
else
F ← 0
F ← 1
n = 0 to F
Compares the S0, S1, KI/O, KI, and TIMER statuses with the register R0n contents. If at least one of the
statuses matches the bits that have been set, the status flag F is set (to 1).
If none of them match, the status flag F is cleared (to 0).
STTS #data4
<1> Instruction code:
:
0 0 0 1 1 1 0 0 0 1
0 0 0 0 0 0 d3 d2 d1 d0
<2> Cycle count:
1
<3> Function:
if statuses match
else
F ← 1
F ← 0
Compares the S0, S1, S2, KI/O, KI, and TIMER statuses with the immediate data contents. If at least one
of the statuses matches the bits that have been set, the status flag F is set (to 1).
If none of them match, the status flag F is cleared (to 0).
SCAF (Set Carry If ACC = FH)
<1> Instruction code:
1 1 0 1 0 1 0 0 1 1
<2> Cycle count:
1
<3> Function:
if
CY ← 1
A = 0FH
else
CY ← 0
Sets the carry flag CY (to 1) if the accumulator contents are FH.
The accumulator values after executing the SCAF instruction are as follows:
Accumulator Value
Before Execution
Carry Flag
After Execution
×××0
0000
0 (clear)
××01
0001
0 (clear)
×011
0011
0 (clear)
0111
0111
0 (clear)
1111
1111
1 (set)
Remark
×: don’t care
NOP
<1> Instruction code:
0 0 0 0 0 0 0 0 0 0
<2> Cycle count:
1
<3> Function:
PC ← PC + 1
No operation
Data Sheet U17848EJ3V0DS
59
µPD6P8, 6P8A, 6P8B
11. ASSEMBLER RESERVED WORDS
11.1 Mask Option Directives
When creating a program in the µPD6P8, 6P8A, 6P8B, it is necessary to use a mask option quasi-directive in
the assembler’s source program. To create a program for the µPD6P8, 6P8A, or 6P8B, a mask option pseudo
instruction must be used in the assembler source program, but since the µPD6P8, 6P8A, or 6P8B does not have
a mask option, describe NOUSECAP.
11.1.1 OPTION and ENDOP quasi-directives
The quasi-directives from the OPTION quasi-directive down to the ENDOP quasi-directive are called the mask
option definition block. The format of the mask option definition block is as follows:
Format
Symbol field
Mnemonic field
[Label:]
OPTION
Operand field
Comment field
[; Comment]
:
:
ENDOP
11.1.2 Mask option definition quasi-directives
The quasi-directives that can be used in the mask option definition block are listed in Table 10-1.
The mask option definition can only be specified as follows. Be sure to specify the following quasi-directives.
Example
Symbol field
Mnemonic field
Operand field
Comment field
OPTION
NOUSECAP
; Capacitor for oscillation
ENDOP
; not incorporated
Table 11-1. Mask Option Definition Directives
Name
CAP
60
Mask Option Definition Quasi-Directive
PRO File
Address Value
Data Value
2043H
00
NOUSECAP
(Capacitor for oscillation not incorporated)
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
12.WRITING AND VERIFYING ONE-TIME PROM (PROGRAM MEMORY) (µPD6P8)
The program memory of the µPD6P8 is a one-time PROM of 2026 × 10 bits.
To write or verify this one-time PROM, the pins shown in Table 5-1 are used. Note that no address input pin
is used. Instead, the address is updated by using the clock input from the CLK pin.
Table 12-1. Pins Used to Write/Verify Program Memory
Pin Name
Function
VPP
Supplies voltage when writing/verifying program memory.
Apply +10.5 V to this pin.
VDD
Power supply.
Supply +3 V to this pin when writing/verifying program memory.
CLK
Inputs clock to update address when writing/verifying program memory.
By inputting a pulse four times to the CLK pin, the address of the program memory is updated.
MD0 to MD3
Input to select the operation mode when writing/verifying program memory.
D0 to D7
Inputs/outputs 8-bit data when writing/verifying program memory.
X IN, XOUT
Clock necessary for writing program memory. Connect a 4 MHz ceramic resonator to this pin.
12.1 Operating Mode When Writing/Verifying Program Memory
The µPD6P8 is set in the program memory write/verify mode when +10.5 V is applied to the VPP pin after the
µPD6P8 has been in the reset status (VDD = 3 V, VPP = 0 V) for a specific time. In this mode, the operating modes
shown in Table 5-2 can be set by setting the MD0 through MD3 pins. Connect all the pins other than those shown
in Table 5-1 to GND via pull-down resistors.
Table 12-2. Setting Operating Mode
Setting of Operating Mode
VPP
+10.5 V
VDD
+3 V
Operating Mode
MD0
MD1
MD2
MD3
H
L
H
L
L
H
H
H
Write mode
L
L
H
H
Verify mode
H
×
H
H
Program inhibit mode
Clear program memory address to 0
×: don’t care (L or H)
Data Sheet U17848EJ3V0DS
61
µPD6P8, 6P8A, 6P8B
12.2 Program Memory Writing Procedure
The program memory is written at high speed by the following procedure.
(1)
Pull down the pins not used to GND via a resistor. Keep the CLK pin low.
(2)
Supply 3 V to the V DD pin. Keep the V PP pin low.
(3)
Supply 3 V to the V PP pin after waiting for 10 µ s.
(4)
Wait for 2 ms until oscillation of the ceramic resonator connected across the X IN and X OUT pins stabilizes.
(5)
Set the program memory address 0 clear mode by using the mode setting pins.
(6)
Supply 10.5 V to V PP.
(7)
Set the program inhibit mode.
Input a pulse to the CLK pin four times.
(8)
Write data to the program memory in the 100 µ s write mode.
(9)
Set the program inhibit mode.
(10) Set the verify mode. If the data have been written to the program memory, proceed to (11). If not, repeat
steps (8) through (10).
(11) Additional writing of (number of times of writing in (8) through (10): X) × 100 µ s.
(12) Set the program inhibit mode.
(13) Input a pulse to the CLK pin four times to update the program memory address (+1).
(14) Repeat steps (8) through (13) up to the last address.
(15) Set the 0 clear mode of the program memory address.
(16) Change the voltages on the V PP pin to 3 V.
(17) Turn off the power.
The following figure illustrates steps (2) through (13) above.
Oscillation stabilization
wait time
Reset
Repeated X time
Write
Verify
Additional write
Address
increment
VPP
VPP
VDD
GND
VDD
VDD
GND
CLK
D0 to D7
Hi-Z
Data input
Hi-Z
Data output
MD0
MD1
MD2
MD3
62
Data Sheet U17848EJ3V0DS
Hi-Z
Data input
Hi-Z
µPD6P8, 6P8A, 6P8B
12.3 Program Memory Reading Procedure
(1)
Pull down the pins not used to GND via a resistor. Keep the CLK pin low.
(2)
Supply 3 V to the V DD pin. Keep the V PP pin low.
(3)
Supply 3 V to the V PP pin after waiting for 10 µ s.
(4)
Wait for 2 ms until oscillation of the ceramic resonator connected across the X IN and X OUT pins stabilizes.
(5)
Set the program memory address 0 clear mode by using the mode setting pins.
(6)
Supply 10.5 V to V PP.
(7)
Set the program inhibit mode.
Input a pulse to the CLK pin four times.
(8)
Set the verify mode. Data of each address is output sequentially each time the clock pulse is input to
the CLK pin four times.
(9)
Set the program inhibit mode.
(10) Set the program memory address 0 clear mode.
(11) Change the voltage on the V PP pin to 3 V.
(12) Turn off the power.
The following figure illustrates steps (2) through (10) above.
Reset
Oscillation stabilization
wait time
VPP
VPP
VDD
GND
VDD
VDD
GND
CLK
D0 to D7
Hi-Z
Data output
Data output
Hi-Z
MD0
MD1
"L"
MD2
MD3
Data Sheet U17848EJ3V0DS
63
µPD6P8, 6P8A, 6P8B
13.WRITING AND VERIFICATION OF ONE-TIME PROM (PROGRAM MEMORY) (µPD6P8A, 6P8B)
The program memory built into the µPD6P8A and 6P8B is a one-time PROM of 2026 × 10 bits.
Writing or verification of this one-time PROM is performed using the pins listed in Table 13-1, and a 5-bit
instruction and 5-bit data via serial communication. The assembler output has an 8-bit configuration, so mask the
higher three bits and program the lower five bits.
Table 13-1. Pins Used During Program Memory Writing/Verification
Pin No.
Symbol
Function
I/O
2
SO
Serial data output during program memory verification
Output
3
SCLK
Clock input during program memory writing or verification
Input
4
SI
Serial data input during program memory writing
Input
6
VDD
Power supply
7
XOUT
Clock required during program memory writing or verification. Connect a
8
XIN
4 MHz ceramic resonator to these pins.
9
GND
GND
–
10
VPP
Voltage application pin during program memory writing or verification.
–
–
Supply +3 V to this pin during program memory writing or verification.
–
Input
Apply +10.5 V to this pin.
13.1 Initialization
When a high voltage (10.5 V) is supplied to VPP, the programming mode is set after about 1 ms.
In the programming mode, pins not used for programming are pulled down internally, so leave them open.
S1/LED is set to output mode (H) when 3 V is supplied to VDD and VPP. When a high voltage (10.5 V) is supplied
to VPP, the input mode is set after about 1 ms.
Serial communication is performed in 5-bit units, starting from the MSB.
64
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
Perform initialization according to the following procedure.
(1)
Supply 3 V to the V DD pin. Set the V PP pin to low level.
(2)
Supply 3 V (same potential as V DD) to the VPP pin after waiting for 10 µ s.
(3)
Wait for 2 ms until oscillation stabilizes.
(4)
Supply 10.5 V to the V PP pin.
(5)
Wait for 1 ms until oscillation stabilizes.
(6)
Transmit the PCRESET instruction from the programmer.
(7)
Transmit the SSVERIFY instruction from the programmer for silicon signature verification.
2
1
3
4
5
6
7
VPP (10.5 V)
VPP
VDD
GND
10 µ s
VDD
VDD
GND
13.2 Serial Communication Format
Instruction
Data
All instructions consist of a 5-bit instruction and 5-bit data.
The data from the programmer is latched at the rising edge of SCLK. The µPD6P8A and 6P8B output data is
output at the falling edge of SCLK.
Instruction format
4
3
2
1
0
MD4
MD3
MD2
MD1
MD0
MD4 to MD0
Instruction
Function
05
Reset
Clearing the program memory address to 0
0C
Verify
Verify mode
0E
Program
Write mode
11
Increment
Incrementing of the program memory address
08
Signature verify
Silicon signature verify mode
01
Inhibit
Program inhibit mode
Data Sheet U17848EJ3V0DS
65
µPD6P8, 6P8A, 6P8B
13.3 Writing of Program Memory
Program
command
Program data
VPP
SCLK
SI
CI4 CI3 CI2 CI1 CI0
0
1
1
1
CI4 CI3 CI2 CI1 CI0
0
SO
13.4 Reading of Program Memory
Verify
command
Read data
VPP
SCLK
SI
CI4 CI3 CI2 CI1 CI0
0
1
1
0
0
SO
66
DO4 DO3 DO2 DO1 DO1
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
14. ELECTRICAL SPECIFICATIONS (µPD6P8)
Absolute Maximum Ratings (TA = +25°C)
Parameter
Power supply voltage
Symbol
Conditions
VDD
VPP
Input voltage
Output voltage
Output current, high
VI
K I/O0-KI/O7, KI0-KI3, S0, S1, S2
VO
IOHNote
V
–0.3 to +11.0
V
–0.3 to V DD + 0.3
V
–0.3 to V DD + 0.3
V
–30
mA
Peak value
rms
–20
mA
LED
Peak value
–7.5
mA
rms
IOLNote
Unit
REM
Per KI/O0-KI/O7 pin
Output current, low
Rating
–0.3 to +5.0
Peak value
–5
mA
–13.5
mA
rms
–9
mA
Total for LED and KI/O0-KI/O7
Peak value
–18
mA
pins
rms
–12
mA
REM
Peak value
7.5
mA
LED
Peak value
rms
rms
5
mA
7.5
mA
5
mA
Operating ambient
temperature
TA
–40 to +85
°C
Storage temperature
Tstg
–65 to +150
°C
Note Calculate the rms with: [rms] = [Peak value] × √Duty.
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for
any parameter. That is, the absolute maximum ratings are rated values at which the product
is on the verge of suffering physical damage, and therefore the product must be used under
conditions that ensure that the absolute maximum ratings are not exceeded.
Recommended Power Supply Voltage Range (TA = –40 to +85°C)
Parameter
Power supply voltage
Symbol
VDD
Conditions
fX = 3.5 to 4.5 MHz
Data Sheet U17848EJ3V0DS
MIN.
TYP.
MAX.
Unit
1.9
3.0
3.6
V
67
µPD6P8, 6P8A, 6P8B
DC Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Item
MAX.
Unit
VDD
V
0.65VDD
VDD
V
0
0.3VDD
V
0
0.15VDD
V
3
µA
S 0, S 1 , S 2
V I = VDD, pull-down resistor not incorporated
3
µA
ILIL1
KI0-KI3
VI = 0 V
–3
µA
ILIL2
KI/O0-KI/O7 VI = 0 V
–3
µA
ILIL3
S 0, S 1 , S 2 V I = 0 V
–3
µA
Output voltage, high
V OH1
REM, LED, K I/O0-KI/O7 IOH = –0.3 mA
Output voltage, low
V OL1
REM, LED
IOL = 0.3 mA
V OL2
KI/O0-KI/O7
IOL = 15 µA
IOH1
REM
V DD = 3.0 V, VOH = 1.0 V
–5
Input voltage, high
Input voltage, low
Input leakage current,
high
Input leakage current,
low
Output current, high
Symbol
Conditions
MIN.
V IH1
KI/O0-KI/O7
0.7VDD
V IH2
K I0-KI3, S0, S1, S2
V IL1
KI/O0-KI/O7
V IL2
K I0-KI3, S0, S1, S2
ILIH1
KI0-KI3
V I = VDD, pull-down resistor not incorporated
ILIH2
TYP.
0.8VDD
V
0.3
0.4
V
V
–9
mA
IOH2
KI/O0-KI/O7
V DD = 3.0 V, VOH = 2.2 V
–2.5
–5
mA
Output current, low
IOL1
KI/O0-KI/O7
V DD = 3.0 V, VOL = 0.4 V
30
70
µA
V DD = 3.0 V, VOL = 2.2 V
100
220
On-chip pull-down resistor
R1
K I0-KI3, S0, S1, S2
75
150
300
kΩ
250
500
kΩ
3.6
V
1.8
1.9
V
µA
R2
KI/O0-KI/O7
130
Data retention power
supply voltage
V DDOR
In STOP mode
1.2
RAM retention detection
voltage
V ID
Supply current
IDD1
Operation
mode
fX = 4.0 MHz, VDD = 3 V ±10%
1.1
2.2
mA
IDD2
HALT mode
fX = 4.0 MHz, VDD = 3 V ±10%
1.0
2.0
mA
IDD3
STOP mode
V DD = 3 V ±10%
2.2
9.5
µA
V DD = 3 V ±10%, TA = 25°C
2.2
3.5
µA
68
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
AC Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Parameter
Symbol
Instruction execution time
tCY
KI0-KI3, S0, S1 high-level
tH
width
Conditions
When releasing standby mode In HALT mode
In STOP mode
RESET low-level width
tRSL
MIN.
TYP.
MAX.
Unit
14
16
18.5
µs
10
µs
10
µs
Note
µs
10
µs
Note 10 + 284/fX + oscillation growth time
Remark tCY = 64/fX (fX: System clock oscillation frequency)
POC Circuit (TA = –40 to +85°C)
Parameter
POC detection
voltageNote
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
1.8
1.9
V
V POC
Note Refers to the voltage with which the POC circuit releases an internal reset. If VPOC < VDD, the internal
reset is released.
From the time of VPOC ≥ VDD until the internal reset takes effect, lag of up to 1 ms occurs. When the period
of VPOC ≥ VDD lasts less than 1 ms, the internal reset may not take effect.
System Clock Oscillator Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Parameter
Oscillation frequency
Symbol
Conditions
fX
MIN.
TYP.
MAX.
Unit
3.5
4.0
4.5
MHz
(ceramic resonator)
External circuit example
XIN
C1
XOUT
C2
Remark For the resonator selection and oscillator constant, customers are required to either evaluate the
oscillation themselves or apply to the resonator manufacturer for evaluation.
Data Sheet U17848EJ3V0DS
69
µPD6P8, 6P8A, 6P8B
RECOMMENDED OSCILLATOR CONSTANT
Ceramic Resonator (TA = –40 to +85°C)
Manufacturer
Part Number
Frequency Recommended Constant (pF)
(MHz)
Murata Mfg.
CSTCC3M50G56-R0
Co., Ltd.
CSTLS3M50G56-B0
CSTCC3M64G56-R0
3.50
C1
Oscillation Voltage Range (VDD)
C2
Unnecessary (on-chip C type)
MIN.
1.9
Remark
MAX.
3.6
–
3.64
CSTLS3M64G56-B0
CSTCR4M00G55-R0
4.00
CSTLS4M00G56-B0
CSTCR4M19G55-R0
4.19
CSTLS4M19G56-B0
CSTCR4M50G55-R0
4.50
CSTLS4M50G56-B0
External circuit example
XIN
XOUT
C1
C2
Caution These oscillator constants are reference values based on evaluation by the manufacturer of
the resonator under a specific environment.
If optimization of the oscillator characteristics is required for the actual application, apply to
the resonator manufacturer for evaluation on the mounting circuit.
The oscillation voltage and oscillation frequency only indicate the oscillator characteristics;
the oscillator must be used within the ratings of the DC and AC characteristics specified under
the internal operation conditions.
Remark The incorporation of the oscillation capacitor by a mask option is under evaluation.
70
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
PROM Programming Mode
DC programming characteristics (TA = 25°C, VDD = 3.0 ±0.3 V, VPP = 10.5 ±0.3 V)
Parameter
Input voltage, high
Input voltage, low
Symbol
Conditions
V IH1
Other than CLK
V IH2
CLK
V IL1
Other than CLK
V IL2
CLK
Input leakage current
ILI
V IN = VIL or VIH
Output voltage, high
V OH
IOH = –1 mA
Output voltage, low
VOL
IOL = 1.6 mA
V DD supply current
IDD
V PP supply current
IPP
MIN.
MAX.
Unit
VDD
V
VDD – 0.5
VDD
V
0
0.3VDD
V
0
0.4
V
10
µA
0.7VDD
TYP.
VDD – 1.0
MD0 = VIL, MD1 = VIH
V
0.4
V
30
mA
30
mA
Cautions 1. Keep VPP to within +11.0 V including overshoot.
2. Apply VDD before VPP and turns it off after VPP.
Data Sheet U17848EJ3V0DS
71
µPD6P8, 6P8A, 6P8B
AC programming characteristics (TA = 25°C, VDD = 3.0 ±0.3 V, VPP = 10.5 ±0.3 V)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Address setup timeNote 1 (to MD0↓)
tAS
2
µs
MD1 setup time (to MD0↓)
tM1S
2
µs
Data setup time (to MD0↓)
tDS
2
µs
tAH
2
µs
tDH
2
µs
Delay time from MD0↑ to data output float
tDF
0
V PP setup time (to MD3↑)
tVPS
2
V DD setup time (to MD3↑)
tVDS
2
Initial program pulse width
tPW
0.095
Additional program pulse width
tOPW
0.095
MD0 setup time (to MD1↑)
tMOS
2
Address hold
timeNote 1
(from MD0↑)
Data hold time (from MD0↑)
Delay time from MD0↓ to data output
tDV
MD0 = MD1 = VIL
MD1 hold time (from MD0↑)
tM1H
tM1H+tM1R ≥ 50 µs
MD1 recovery time (to MD0↓)
Program counter reset time
4
µs
µs
µs
0.1
0.105
ms
2.1
ms
µs
4
µs
2
µs
tM1R
2
µs
tPCR
10
µs
CLK input high-/low-level width
tXH, tXL
CLK input frequency
fX
µs
0.125
4.19
MHz
Initial mode set time
tI
2
µs
MD3 setup time (to MD1↑)
tM3S
2
µs
MD3 hold time (from MD1↓)
tM3H
2
µs
MD3 setup time (to MD0↓)
tM3SR
When program memory is read
2
µs
Delay time from
addressNote 1
tOAD
When program memory is read
Hold time from addressNote 1 to data output
to data output
tHAD
When program memory is read
0
MD3 hold time (from MD0↑)
tM3HR
When program memory is read
2
Delay time from MD3↓ to data output float
tDFR
When program memory is read
4
µs
4
µs
µs
4
µs
Reset setup time
tRES
10
µs
Oscillation stabilization wait timeNote 2
tWAIT
2
ms
Notes 1. The internal address signal is incremented at the falling edge of the third clock of CLK.
2. Connect a 4 MHz ceramic resonator between the XIN and XOUT pins.
72
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
Program Memory Write Timing
tWAIT
VPP
VDD
GND
VPP
VDD
tVPS
tRES
VDD
GND
tXH
tXH
CLK
D0 to D7
tXL
Hi-Z
Hi-Z
Data input
tDS
tI
tDH
tAS
Data output
tDV
tXL
Hi-Z
Data input
tDH
tAH
tDS
tDF
Hi-Z
Data input
Hi-Z
tAS
MD0
tPW
tM1R
tMOS
tOPW
MD1
tPCR
tM1S
tM1H
MD2
tM3H
tM3S
MD3
Program Memory Read Timing
tWAIT
tRES
tVPS
VPP
VPP
VDD
GND
VDD
VDD
tXH
tXH
GND
CLK
tDAD
tHAD
tXL
tXL
Hi-Z
D0-D7
Data output
Hi-Z
Data output
tDV
tDV
tI
tM3HR
tDFR
MD0
MD1
"L"
tPCR
MD2
tM3SR
MD3
Data Sheet U17848EJ3V0DS
73
µPD6P8, 6P8A, 6P8B
15. ELECTRICAL SPECIFICATIONS (µPD6P8A)
Absolute Maximum Ratings (TA = +25°C)
Parameter
Power supply voltage
Symbol
Conditions
VDD
VPP
Input voltage
Output voltage
Output current, high
VI
KI/O0-KI/O7, KI0-KI3, S0, S1, S2
VO
IOHNote
V
–0.3 to +11.0
V
–0.3 to VDD + 0.3
V
–0.3 to VDD + 0.3
V
–30
mA
Peak value
rms
–20
mA
LED
Peak value
–7.5
mA
rms
IOLNote
Unit
REM
Per KI/O0-KI/O7 pin
Output current, low
Rating
–0.3 to +5.0
Peak value
–5
mA
–13.5
mA
rms
–9
mA
Total for LED and KI/O0-KI/O7
Peak value
–18
mA
pins
rms
–12
mA
REM
Peak value
7.5
mA
LED
Peak value
rms
rms
5
mA
7.5
mA
5
mA
Operating ambient
temperature
TA
–40 to +85
°C
Storage temperature
Tstg
–65 to +150
°C
Note Calculate the rms with: [rms] = [Peak value] × √Duty.
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for
any parameter. That is, the absolute maximum ratings are rated values at which the product
is on the verge of suffering physical damage, and therefore the product must be used under
conditions that ensure that the absolute maximum ratings are not exceeded.
Recommended Power Supply Voltage Range (TA = –40 to +85°C)
Parameter
Power supply voltage
74
Symbol
VDD
Conditions
fX = 3.5 to 4.5 MHz
Data Sheet U17848EJ3V0DS
MIN.
TYP.
MAX.
Unit
1.9
3.0
3.6
V
µPD6P8, 6P8A, 6P8B
DC Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Item
MAX.
Unit
VDD
V
0.65VDD
VDD
V
0
0.3VDD
V
0
0.15VDD
V
3
µA
S 0, S 1 , S 2
V I = VDD, pull-down resistor not incorporated
3
µA
ILIL1
KI0-KI3
VI = 0 V
–3
µA
ILIL2
KI/O0-KI/O7 VI = 0 V
–3
µA
ILIL3
S 0, S 1 , S 2 V I = 0 V
–3
µA
Output voltage, high
V OH1
REM, LED, K I/O0-KI/O7 IOH = –0.3 mA
Output voltage, low
V OL1
REM, LED
IOL = 0.3 mA
V OL2
KI/O0-KI/O7
IOL = 15 µA
IOH1
REM
VDD = 3.0 V, V OH = 1.0 V
–5
Input voltage, high
Input voltage, low
Input leakage current,
high
Input leakage current,
low
Output current, high
<R>
Symbol
Conditions
MIN.
V IH1
KI/O0-KI/O7
0.7VDD
V IH2
K I0-KI3, S0, S1, S2
V IL1
KI/O0-KI/O7
V IL2
K I0-KI3, S0, S1, S2
ILIH1
KI0-KI3
V I = VDD, pull-down resistor not incorporated
ILIH2
TYP.
0.8VDD
V
0.3
0.4
V
V
–9
mA
IOH2
KI/O0-KI/O7
VDD = 3.0 V, V OH = 2.2 V
–2.5
–5
mA
Output current, low
IOL1
KI/O0-KI/O7
VDD = 3.0 V, V OL = 0.4 V
30
70
µA
VDD = 3.0 V, V OL = 2.2 V
100
220
On-chip pull-down resistor
R1
K I0-KI3, S0, S1, S2
75
150
300
kΩ
250
500
kΩ
3.6
V
1.6
1.7
V
µA
R2
KI/O0-KI/O7
130
Data retention power
supply voltage
V DDOR
In STOP mode
1.2
RAM retention detection
voltage
V ID
Supply current
IDD1
Operation
mode
fX = 4.0 MHz, VDD = 3 V ±10%
0.7
1.4
mA
IDD2
HALT mode
fX = 4.0 MHz, VDD = 3 V ±10%
0.65
1.3
mA
IDD3
STOP mode
V DD = 3 V ±10%
2.2
9.5
µA
V DD = 3 V ±10%, TA = 25°C
2.2
3.5
µA
Data Sheet U17848EJ3V0DS
75
µPD6P8, 6P8A, 6P8B
AC Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Parameter
Symbol
Instruction execution time
tCY
KI0-KI3, S0, S1 high-level
tH
width
Conditions
When releasing standby mode In HALT mode
In STOP mode
RESET low-level width
tRSL
MIN.
TYP.
MAX.
Unit
14
16
18.5
µs
10
µs
10
µs
Note
µs
10
µs
Note 10 + 1024/fX + oscillation growth time
<R>
Remark tCY = 64/fX (fX: System clock oscillation frequency)
POC Circuit (TA = –40 to +85°C)
Parameter
POC detection
voltageNote
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
1.8
1.9
V
VPOC
Note Refers to the voltage with which the POC circuit releases an internal reset. If VPOC < VDD, the internal
reset is released.
From the time of VPOC ≥ VDD until the internal reset takes effect, lag of up to 1 ms occurs. When the period
of VPOC ≥ VDD lasts less than 1 ms, the internal reset may not take effect.
System Clock Oscillator Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Parameter
Oscillation frequency
Symbol
Conditions
fX
MIN.
TYP.
MAX.
Unit
3.5
4.0
4.5
MHz
(ceramic resonator)
External circuit example
XIN
C1
XOUT
C2
Remark For the resonator selection and oscillator constant, customers are required to either evaluate the
oscillation themselves or apply to the resonator manufacturer for evaluation.
76
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
<R>
PROM Programming Mode
DC programming characteristics (TA = 25°C, VDD = 3.0 ±0.3 V, VPP = 10.5 ±0.3 V)
Parameter
Input voltage, high
Input voltage, low
Symbol
Conditions
VIH1
Other than SCLK
VIH2
SCLK
VIL1
Other than SCLK
VIL2
SCLK
Input leakage current
ILI
VIN = VIL or VIH
Output voltage, high
VOH
IOH = –1 mA
Output voltage, low
VOL
IOL = 1.6 mA
MIN.
TYP.
MAX.
Unit
VDD
V
VDD – 0.5
VDD
V
0
0.3VDD
V
0
0.4
V
10
µA
0.7VDD
VDD – 1.0
V
0.4
V
VDD supply current
IDD
2
mA
VPP supply current
IPP
0.3
mA
Cautions 1. Keep VPP to within +11.0 V including overshoot.
2. Apply VDD before VPP and turns it off after VPP.
AC programming characteristics (TA = 25°C, VDD = 3.0 ±0.3 V, VPP = 10.5 ±0.3 V)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Reset setup time
tRES
10
µs
Oscillation stabilization wait time1
tWAIT1
2
ms
Oscillation stabilization wait time2
tWAIT2
1
ms
SCLK cycle time
tKCY
VPP setup time (to Program command)
tWA
1.8
ms
Program command → Data input wait time
tWI
0.25
µs
Program data → Command input wait time
tWR
90
µs
VPP setup time (to Verify command)
tRA
1.8
ms
Verify command → Data output wait time
tRI
5
µs
Verify data → Command input wait time
tRE
0.25
µs
VPP setup time
tOA
1.8
ms
tOI
0.25
µs
tOT
0.25
µs
1
MHz
(to Reset, Increase, Inhibit command)
Reset, Increase, Inhibit command
→ Data (NULL) input wait time
Reset, Increase, Inhibit command
→ Command input wait time
Data Sheet U17848EJ3V0DS
77
µPD6P8, 6P8A, 6P8B
<R> Program Memory Access Timing
tRES
tWAIT1
tWA, tRA,
tWAIT2 tOA
VPP
VPP
VDD
GND
VDD
GND
tKCY
tWI, tRI,
tOI
tWR, tRE,
tOT
SCLK
SI
SO
78
CI4 CI3 CI2 CI1 CI0
CI4 CI3 CI2 CI1 CI0
DO4 DO3 DO2 DO1 DO0
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
16. ELECTRICAL SPECIFICATIONS (µPD6P8B) (TARGET)
Absolute Maximum Ratings (TA = +25°C)
Parameter
Power supply voltage
Symbol
Conditions
VDD
VPP
Input voltage
Output voltage
Output current, high
VI
K I/O0-KI/O7, KI0-KI3, S0, S1, S2
VO
IOHNote
V
–0.3 to +11.0
V
–0.3 to V DD + 0.3
V
–0.3 to V DD + 0.3
V
–30
mA
Peak value
rms
–20
mA
LED
Peak value
–7.5
mA
rms
IOLNote
Unit
REM
Per KI/O0-KI/O7 pin
Output current, low
Rating
–0.3 to +5.0
Peak value
–5
mA
–13.5
mA
rms
–9
mA
Total for LED and KI/O0-KI/O7
Peak value
–18
mA
pins
rms
–12
mA
REM
Peak value
7.5
mA
LED
Peak value
rms
rms
5
mA
7.5
mA
5
mA
Operating ambient
temperature
TA
–40 to +85
°C
Storage temperature
Tstg
–65 to +150
°C
Note Calculate the rms with: [rms] = [Peak value] × √Duty.
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for
any parameter. That is, the absolute maximum ratings are rated values at which the product
is on the verge of suffering physical damage, and therefore the product must be used under
conditions that ensure that the absolute maximum ratings are not exceeded.
Recommended Power Supply Voltage Range (TA = –40 to +85°C)
Parameter
Power supply voltage
Symbol
VDD
Conditions
fX = 3.5 to 4.5 MHz
Data Sheet U17848EJ3V0DS
MIN.
TYP.
MAX.
Unit
1.9
3.0
3.6
V
79
µPD6P8, 6P8A, 6P8B
DC Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Item
Symbol
Conditions
MIN.
MAX.
Unit
VDD
V
0.65VDD
VDD
V
0
0.3VDD
V
0
0.15VDD
V
3
µA
S 0, S 1 , S 2
V I = VDD, pull-down resistor not incorporated
3
µA
ILIL1
KI0-KI3
VI = 0 V
–3
µA
ILIL2
KI/O0-KI/O7 VI = 0 V
–3
µA
ILIL3
S 0, S 1 , S 2 V I = 0 V
–3
µA
Output voltage, high
V OH1
REM, LED, K I/O0-KI/O7 IOH = –0.3 mA
Output voltage, low
V OL1
REM, LED
V OL2
KI/O0-KI/O7
IOL = 15 µA
IOH1
REM
V DD = 3.0 V, VOH = 1.0 V
–5
Input voltage, high
V IH1
KI/O0-KI/O7
0.7VDD
V IH2
K I0-KI3, S0, S1, S2
Input voltage, low
V IL1
KI/O0-KI/O7
V IL2
K I0-KI3, S0, S1, S2
Input leakage current,
high
ILIH1
KI0-KI3
V I = VDD, pull-down resistor not incorporated
ILIH2
Input leakage current,
low
Output current, high
TYP.
0.8VDD
V
IOL = 0.3 mA
0.3
0.4
V
V
–9
mA
IOH2
KI/O0-KI/O7
V DD = 3.0 V, VOH = 2.2 V
–2.5
–5
mA
Output current, low
IOL1
KI/O0-KI/O7
V DD = 3.0 V, VOL = 0.4 V
30
70
µA
V DD = 3.0 V, VOL = 2.2 V
100
220
On-chip pull-down resistor
R1
K I0-KI3, S0, S1, S2
75
150
300
kΩ
250
500
kΩ
3.6
V
1.6
1.7
V
1.4
mA
µA
R2
KI/O0-KI/O7
130
Data retention power
supply voltage
V DDOR
In STOP mode
1.2
RAM retention detection
voltage
V ID
Supply current
IDD1
Operation
mode
fX = 4.0 MHz, VDD = 3 V ±10%
0.7
IDD2
HALT mode
fX = 4.0 MHz, VDD = 3 V ±10%
0.65
1.3
mA
IDD3
STOP mode
V DD = 3 V ±10%
2.2
9.5
µA
V DD = 3 V ±10%, TA = 25°C
2.2
3.5
µA
80
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
AC Characteristics (TA = –40 to +85°C, VDD = 1.9 to 3.6 V)
Parameter
Symbol
Instruction execution time
tCY
KI0-KI3, S0, S1 high-level
tH
width
Conditions
When releasing standby mode In HALT mode
In STOP mode
RESET low-level width
<R>
tRSL
MIN.
TYP.
MAX.
Unit
14
16
18.5
µs
10
µs
10
µs
Note
µs
10
µs
Note 10 + 1024/fX + oscillation growth time
Remark tCY = 64/fX (fX: System clock oscillation frequency)
POC Circuit (TA = –40 to +85°C)
Parameter
POC detection
voltageNote
Symbol
Conditions
MIN.
VPOC
TYP.
MAX.
Unit
1.8
1.9
V
Note Refers to the voltage with which the POC circuit releases an internal reset. If VPOC < VDD, the internal
reset is released.
From the time of VPOC ≥ VDD until the internal reset takes effect, lag of up to 1 ms occurs. When the period
of VPOC ≥ VDD lasts less than 1 ms, the internal reset may not take effect.
Internal Oscillator Characteristics (TA = –10 to +70°C, VDD = 2.0 to 3.6 V)
Parameter
Oscillation frequency
Symbol
Conditions
fX
Data Sheet U17848EJ3V0DS
MIN.
TYP.
MAX.
Unit
3.92
4.0
4.08
MHz
81
µPD6P8, 6P8A, 6P8B
<R> PROM Programming Mode
DC programming characteristics (TA = 25°C, VDD = 3.0 ±0.3 V, VPP = 10.5 ±0.3 V)
Parameter
Input voltage, high
Symbol
Conditions
VIH1
Other than SCLK
VIH2
SCLK
VIL1
Other than SCLK
VIL2
SCLK
ILI
VIN = VIL or VIH
Output voltage, high
VOH
IOH = –1 mA
Output voltage, low
VOL
IOL = 1.6 mA
Input voltage, low
Input leakage current
MIN.
TYP.
MAX.
Unit
VDD
V
VDD – 0.5
VDD
V
0
0.3VDD
V
0
0.4
V
10
µA
0.7VDD
VDD – 1.0
V
0.4
V
VDD supply current
IDD
2
mA
VPP supply current
IPP
0.3
mA
Cautions 1. Keep VPP to within +11.0 V including overshoot.
2. Apply VDD before VPP and turns it off after VPP.
AC programming characteristics (TA = 25°C, VDD = 3.0 ±0.3 V, VPP = 10.5 ±0.3 V)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
Reset setup time
tRES
10
µs
Oscillation stabilization wait time1
tWAIT1
2
ms
Oscillation stabilization wait time2
tWAIT2
1
ms
SCLK cycle time
tKCY
VPP setup time (to Program command)
tWA
1.8
ms
Program command → Data input wait time
tWI
0.25
µs
Program data → Command input wait time
tWR
90
µs
VPP setup time (to Verify command)
tRA
1.8
ms
Verify command → Data output wait time
tRI
5
µs
Verify data → Command input wait time
tRE
0.25
µs
VPP setup time
tOA
1.8
ms
tOI
0.25
µs
tOT
0.25
µs
1
MHz
(to Reset, Increase, Inhibit command)
Reset, Increase, Inhibit command
→ Data (NULL) input wait time
Reset, Increase, Inhibit command
→ Command input wait time
82
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
<R>
Program Memory Access Timing
tRES
tWAIT1
tWA, tRA,
tWAIT2 tOA
VPP
VPP
VDD
GND
VDD
GND
tKCY
tWI, tRI,
tOI
tWR, tRE,
tOT
SCLK
SI
SO
CI4 CI3 CI2 CI1 CI0
CI4 CI3 CI2 CI1 CI0
DO4 DO3 DO2 DO1 DO0
Data Sheet U17848EJ3V0DS
83
µPD6P8, 6P8A, 6P8B
17. CHARACTERISTIC CURVES (REFERENCE VALUES) (µPD6P8)
IOL vs. VOL (REM, LED)
(TA = 25°C, VDD = 3.0 V)
IDD vs. VDD (fx = 4 MHz)
(TA = 25°C)
25
1
Low-level output current IOL [mA]
Power supply current IDD [mA]
0.9
0.8
0.7
0.6
Operation mode
0.5
0.4
HALT mode
0.3
0.2
20
15
10
5
0.1
0
1.5
2
2.5
3
3.6
0
4
450
Low-level output current IOL [µ A]
High-level output current IOH [mA]
500
− 16
− 14
− 12
− 10
−8
−6
−4
−2
400
350
300
250
200
150
100
50
VDD − 1
VDD − 2
VDD − 3
High-level output voltage VOH [V]
84
3
IOL vs. VOL (KI/O)
(TA = 25°C, VDD = 3.0 V)
IOH vs. VOH (REM, LED, KI/O)
(TA = 25°C, VDD = 3.0 V)
− 18
0
VDD
2
Low-level output voltage VOL [V]
Power supply voltage VDD [V]
− 20
1
Data Sheet U17848EJ3V0DS
0
1
2
Low-level output voltage VOL [V]
3
µPD6P8, 6P8A, 6P8B
18. APPLICATION CIRCUIT EXAMPLE
Example of Application to System
• Remote-control transmitter (48 keys accommodated, mode selection switch accommodated)
+
KI/O6
KI/O5
KI/O7
KI/O4
S0
KI/O3
S1/LED
KI/O2
REM
KI/O1
VDD
KI/O0
XOUT
KI3
XIN
KI2
GND
KI1
Note
KI0
S2
Mode select
switch
Key matrix
8 × 6 = 48 keys
Note S2: Set to STOP mode release disabled
Data Sheet U17848EJ3V0DS
85
µPD6P8, 6P8A, 6P8B
• Remote-control transmitter (56 keys accommodated)
+
KI/O6
KI/O5
KI/O7
KI/O4
S0
KI/O3
S1/LED
KI/O2
REM
KI/O1
VDD
KI/O0
XOUT
KI3
XIN
KI2
GND
KI1
S2Note
KI0
Key matrix
8 × 7 = 56 keys
Note S2: Set to STOP mode release enabled
86
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
• Remote-control transmitter (56 keys accommodated, mode selection switch accommodated)
Data can be read from the KI/O0 to KI/O7 pins by connecting a pull-up resistor of approx. 50 kΩ and a switch
to these pins (which then become high level when the switch is on and low level when off). Set the KI/O0 to
KI/O7 pins to input mode at this time. Reading data from these pins enables multiple output data to be obtained
for the same key input.
A pull-up resistor can be connected to any of pins KI/O0 to KI/O7 (the figure below shows an example of when
a pull-up resistor is connected to the KI/O5 pin).
VDD
Mode selection
switch
+
KI/O6
KI/O5
KI/O7
KI/O4
S0
KI/O3
S1/LED
KI/O2
REM
KI/O1
VDD
KI/O0
XOUT
KI3
XIN
KI2
GND
KI1
S2Note
KI0
Key matrix
8 × 7 = 56 keys
Note S2: Set to STOP mode release enabled
Data Sheet U17848EJ3V0DS
87
µPD6P8, 6P8A, 6P8B
19. PACKAGE DRAWING
20-PIN PLASTIC SSOP (7.62 mm (300))
20
11
detail of lead end
F
G
T
P
L
U
E
1
10
A
H
I
J
S
N
S
K
C
D
M
M
B
(UNIT:mm)
NOTE
Each lead centerline is located within 0.13 mm of
its true position (T.P.) at maximum material condition.
ITEM
A
MILLIMETERS
6.65±0.15
B
0.475 MAX.
C
0.65 (T.P.)
D
0.08
0.24 +
−0.07
E
0.1±0.05
F
1.3±0.1
G
1.2
H
8.1±0.2
I
6.1±0.2
J
1.0±0.2
K
0.17±0.03
L
0.5
M
0.13
N
0.10
P
3° +5°
−3°
T
0.25
U
0.6±0.15
S20MC-65-5A4-2
88
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
20. RECOMMENDED SOLDERING CONDITIONS
The µPD6P8, 6P8A, and 6P8B must be soldered and mounted under the following recommended conditions.
For soldering methods and conditions other than those recommended below, contact an NEC Electronics sales
representative.
For technical information, see the following website.
Semiconductor Device Mount Manual (http://www.necel.com/pkg/en/mount/index.html)
Table 20-1. Surface Mounting Soldering Conditions
µ PD6P8MC-5A4-A, 6P8AMC-5A4-A, 6P8BMC-5A4-A: 20-pin plastic SSOP (7.62 mm (300))
Soldering Method
Soldering Conditions
Recommended
Condition Symbol
Infrared reflow
Package peak temperature: 260°C, Time: 60 seconds max. (at 220°C or higher),
Count: Three times or less, Exposure limit: 7 daysNote
(after that, prebake at 125°C for 2 to 72 hours)
IR60-207-3
Wave soldering
For details, contact an NEC Electronics sales representative.
–
Partial heating
Pin temperature: 350°C max., Time: 3 seconds max. (per pin row)
–
Note After opening the dry pack, store it at 25°C or less and 65% RH or less for the allowable storage period.
Caution Do not use different soldering methods together (except for partial heating).
Remark Products that have the part numbers suffixed by “-A” are lead-free products.
Data Sheet U17848EJ3V0DS
89
µPD6P8, 6P8A, 6P8B
APPENDIX A. DEVELOPMENT TOOLS
A PROM programmer, program adapter, and an emulator are provided for the µPD6P8, 6P8A, 6P8B.
Hardware
• PROM programmer (AF-9708Note, AF-9709BNote)
These PROM programmers support the µPD6P8, 6P8A, 6P8B.
By connecting a program adapter to this PROM programmer, the µPD6P8, 6P8A, 6P8B can be programmed.
Note These are products of Flash Support Group, Inc. For details, consult Flash Support Group, Inc.
(TEL: +81-53-428-8380).
• Program adapter
(1) TEF340-6P8Note
This is used to program the µPD6P8 in combination with the AF-9708 or AF-9709B.
(2) TEF340-6P8ANote
This is used to program the µPD6P8A, 6P8B in combination with the AF-9708 or AF-9709B.
Note These are products of Flash Support Group, Inc. For details, consult Flash Support Group, Inc.
(TEL: +81-53-428-8380).
• Emulator (EB-69Note, EB-69ANote)
This is used to emulate the µPD6P8, 6P8A, 6P8B.
Note These are products of Naito Densei Machida Mfg. Co., Ltd. For details, contact Naito Densei Machida
Mfg. Co., Ltd. (+81-45-475-4191).
Software
• Assembler (AS6133 Ver. 2.22 or later)
This is a development tool for remote control transmitter software.
Part Number List of AS6133
Host Machine
PC-9800 series
(CPU: 80386 or later)
IBM PC/ATTM compatible
OS
Supply Medium
Part Number
MS-DOSTM (Ver. 5.0 to Ver. 6.2)
3.5-inch 2HD
µS5A13AS6133
MS-DOS (Ver. 6.0 to Ver. 6.22)
3.5-inch 2HC
µS7B13AS6133
PC DOSTM (Ver. 6.1 to Ver. 6.3)
Caution Although Ver.5.0 or later has a task swap function, this function cannot be used with this
software.
90
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
APPENDIX B. EXAMPLE OF REMOTE CONTROL TRANSMISSION FORMAT
(In the case of NEC transmission format in command one-shot transmission mode)
Caution When using the NEC transmission format, please apply for a custom code at NEC Electronics.
(1) REM output waveform (from <2> on, the output is made only when the key is kept pressed)
REM output
58.5 to 76.5 ms
<1>
108 ms
<2>
108 ms
Remark If the key is repeatedly pressed, the power consumption of the infrared light-emitting diode (LED) can
be reduced by sending the reader code and the stop bit from the second time.
(2) Enlarged waveform of <1>
<3>
REM output
9 ms
4.5 ms
Custom code
8 bits
13.5 ms
Leader code
Custom code’
8 bits
Data code
8 bits
18 to 36 ms
Data code
8 bits
Stop Bit
1 bit
27 ms
58.5 to 76.5 ms
(3) Enlarged waveform of <3>
REM output
4.5 ms
9 ms
0.56 ms
1.125 ms 2.25 ms
1
0
13.5 ms
1
0
0
(4) Enlarged waveform of <2>
REM output
2.25 ms
9 ms
11.25 ms
Leader code
Data Sheet U17848EJ3V0DS
0.56 ms
Stop Bit
91
µPD6P8, 6P8A, 6P8B
(5) Carrier waveform (enlarged waveform of each code’s high period)
REM output
8.77 µ s
26.3 µ s
9 ms or 0.56 ms
Carrier frequency: 38 kHz
(6) Bit array of each code
C0 C1 C2 C3 C4 C5 C6 C7 C0’ C1’ C2’ C3’ C4’ C5’ C6’ C7’ D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
=
=
=
=
=
=
=
=
C0 C1 C2 C3 C4 C5 C6 C7
or or or or or or or or
C8 C9 C10 C11 C12 C13 C14 C15
Leader code
Custom code
Custom code’
Data code
Data code
Caution To prevent malfunction with other systems when receiving data in the NEC transmission
format, not only fully decode (make sure to check Data Code as well) the total 32 bits of the
16-bit custom codes (Custom Code, Custom Code’) and the 16-bit data codes (Data Code,
Data Code) but also check to make sure that no signals are present.
92
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
NOTES FOR CMOS DEVICES
1
VOLTAGE APPLICATION WAVEFORM AT INPUT PIN
Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the
CMOS device stays in the area between VIL (MAX) and VIH (MIN) due to noise, etc., the device may
malfunction. Take care to prevent chattering noise from entering the device when the input level is
fixed, and also in the transition period when the input level passes through the area between VIL (MAX)
and VIH (MIN).
2
HANDLING OF UNUSED INPUT PINS
Unconnected CMOS device inputs can be cause of malfunction. If an input pin is unconnected, it is
possible that an internal input level may be generated due to noise, etc., causing malfunction. CMOS
devices behave differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed
high or low by using pull-up or pull-down circuitry. Each unused pin should be connected to VDD or
GND via a resistor if there is a possibility that it will be an output pin. All handling related to unused pins
must be judged separately for each device and according to related specifications governing the device.
3
PRECAUTION AGAINST ESD
A strong electric field, when exposed to a MOS device, can cause destruction of the gate oxide and
ultimately degrade the device operation. Steps must be taken to stop generation of static electricity as
much as possible, and quickly dissipate it when it has occurred.
Environmental control must be
adequate. When it is dry, a humidifier should be used. It is recommended to avoid using insulators that
easily build up static electricity. Semiconductor devices must be stored and transported in an anti-static
container, static shielding bag or conductive material. All test and measurement tools including work
benches and floors should be grounded.
The operator should be grounded using a wrist strap.
Semiconductor devices must not be touched with bare hands. Similar precautions need to be taken for
PW boards with mounted semiconductor devices.
4
STATUS BEFORE INITIALIZATION
Power-on does not necessarily define the initial status of a MOS device. Immediately after the power
source is turned ON, devices with reset functions have not yet been initialized. Hence, power-on does
not guarantee output pin levels, I/O settings or contents of registers. A device is not initialized until the
reset signal is received. A reset operation must be executed immediately after power-on for devices
with reset functions.
5
POWER ON/OFF SEQUENCE
In the case of a device that uses different power supplies for the internal operation and external
interface, as a rule, switch on the external power supply after switching on the internal power supply.
When switching the power supply off, as a rule, switch off the external power supply and then the
internal power supply. Use of the reverse power on/off sequences may result in the application of an
overvoltage to the internal elements of the device, causing malfunction and degradation of internal
elements due to the passage of an abnormal current.
The correct power on/off sequence must be judged separately for each device and according to related
specifications governing the device.
6
INPUT OF SIGNAL DURING POWER OFF STATE
Do not input signals or an I/O pull-up power supply while the device is not powered. The current
injection that results from input of such a signal or I/O pull-up power supply may cause malfunction and
the abnormal current that passes in the device at this time may cause degradation of internal elements.
Input of signals during the power off state must be judged separately for each device and according to
related specifications governing the device.
Data Sheet U17848EJ3V0DS
93
µPD6P8, 6P8A, 6P8B
MS-DOS is either a registered trademark or a trademark of Microsoft Corporation in the United States and/
or other countries.
PC/AT and PC DOS are trademarks of International Business Machines Corporation.
Caution: This product uses SuperFlash technology licensed from Silicon Storage Technology, Inc.
• The information in this document is current as of December, 2007. The information is subject to
change without notice. For actual design-in, refer to the latest publications of NEC Electronics data
sheets or data books, etc., for the most up-to-date specifications of NEC Electronics products. Not
all products and/or types are available in every country. Please check with an NEC Electronics sales
representative for availability and additional information.
• No part of this document may be copied or reproduced in any form or by any means without the prior
written consent of NEC Electronics. NEC Electronics assumes no responsibility for any errors that may
appear in this document.
• NEC Electronics does not assume any liability for infringement of patents, copyrights or other intellectual
property rights of third parties by or arising from the use of NEC Electronics products listed in this document
or any other liability arising from the use of such products. No license, express, implied or otherwise, is
granted under any patents, copyrights or other intellectual property rights of NEC Electronics or others.
• Descriptions of circuits, software and other related information in this document are provided for illustrative
purposes in semiconductor product operation and application examples. The incorporation of these
circuits, software and information in the design of a customer's equipment shall be done under the full
responsibility of the customer. NEC Electronics assumes no responsibility for any losses incurred by
customers or third parties arising from the use of these circuits, software and information.
• While NEC Electronics endeavors to enhance the quality, reliability and safety of NEC Electronics products,
customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To
minimize risks of damage to property or injury (including death) to persons arising from defects in NEC
Electronics products, customers must incorporate sufficient safety measures in their design, such as
redundancy, fire-containment and anti-failure features.
• NEC Electronics products are classified into the following three quality grades: "Standard", "Special" and
"Specific".
The "Specific" quality grade applies only to NEC Electronics products developed based on a customerdesignated "quality assurance program" for a specific application. The recommended applications of an NEC
Electronics product depend on its quality grade, as indicated below. Customers must check the quality grade of
each NEC Electronics product before using it in a particular application.
"Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio
and visual equipment, home electronic appliances, machine tools, personal electronic equipment
and industrial robots.
"Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster
systems, anti-crime systems, safety equipment and medical equipment (not specifically designed
for life support).
"Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life
support systems and medical equipment for life support, etc.
The quality grade of NEC Electronics products is "Standard" unless otherwise expressly specified in NEC
Electronics data sheets or data books, etc. If customers wish to use NEC Electronics products in applications
not intended by NEC Electronics, they must contact an NEC Electronics sales representative in advance to
determine NEC Electronics' willingness to support a given application.
(Note)
(1) "NEC Electronics" as used in this statement means NEC Electronics Corporation and also includes its
majority-owned subsidiaries.
(2) "NEC Electronics products" means any product developed or manufactured by or for NEC Electronics (as
defined above).
M8E 02. 11-1
94
Data Sheet U17848EJ3V0DS
µPD6P8, 6P8A, 6P8B
For further information,
please contact:
NEC Electronics Corporation
1753, Shimonumabe, Nakahara-ku,
Kawasaki, Kanagawa 211-8668,
Japan
Tel: 044-435-5111
http://www.necel.com/
[America]
[Europe]
[Asia & Oceania]
NEC Electronics America, Inc.
2880 Scott Blvd.
Santa Clara, CA 95050-2554, U.S.A.
Tel: 408-588-6000
800-366-9782
http://www.am.necel.com/
NEC Electronics (Europe) GmbH
Arcadiastrasse 10
40472 Düsseldorf, Germany
Tel: 0211-65030
http://www.eu.necel.com/
NEC Electronics (China) Co., Ltd
7th Floor, Quantum Plaza, No. 27 ZhiChunLu Haidian
District, Beijing 100083, P.R.China
Tel: 010-8235-1155
http://www.cn.necel.com/
Hanover Office
Podbielskistrasse 166 B
30177 Hannover
Tel: 0 511 33 40 2-0
Munich Office
Werner-Eckert-Strasse 9
81829 München
Tel: 0 89 92 10 03-0
Stuttgart Office
Industriestrasse 3
70565 Stuttgart
Tel: 0 711 99 01 0-0
United Kingdom Branch
Cygnus House, Sunrise Parkway
Linford Wood, Milton Keynes
MK14 6NP, U.K.
Tel: 01908-691-133
Succursale Française
9, rue Paul Dautier, B.P. 52
78142 Velizy-Villacoublay Cédex
France
Tel: 01-3067-5800
Sucursal en España
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28007 Madrid, Spain
Tel: 091-504-2787
Tyskland Filial
Täby Centrum
Entrance S (7th floor)
18322 Täby, Sweden
Tel: 08 638 72 00
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20124 Milano, Italy
Tel: 02-667541
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Room 2509-2510, Bank of China Tower,
200 Yincheng Road Central,
Pudong New Area, Shanghai, P.R.China P.C:200120
Tel:021-5888-5400
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Unit 01, 39/F, Excellence Times Square Building,
No. 4068 Yi Tian Road, Futian District, Shenzhen,
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Tel:0755-8282-9800
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Unit 1601-1613, 16/F., Tower 2, Grand Century Place,
193 Prince Edward Road West, Mongkok, Kowloon, Hong Kong
Tel: 2886-9318
http://www.hk.necel.com/
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7F, No. 363 Fu Shing North Road
Taipei, Taiwan, R. O. C.
Tel: 02-8175-9600
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238A Thomson Road,
#12-08 Novena Square,
Singapore 307684
Tel: 6253-8311
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11F., Samik Lavied’or Bldg., 720-2,
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Seoul, 135-080, Korea
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http://www.kr.necel.com/
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G0706