Renesas M38C86EE Single-chip 8-bit cmos microcomputer Datasheet

To all our customers
Regarding the change of names mentioned in the document, such as Mitsubishi
Electric and Mitsubishi XX, to Renesas Technology Corp.
The semiconductor operations of Hitachi and Mitsubishi Electric were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.)
Accordingly, although Mitsubishi Electric, Mitsubishi Electric Corporation, Mitsubishi
Semiconductors, and other Mitsubishi brand names are mentioned in the document, these names
have in fact all been changed to Renesas Technology Corp. Thank you for your understanding.
Except for our corporate trademark, logo and corporate statement, no changes whatsoever have been
made to the contents of the document, and these changes do not constitute any alteration to the
contents of the document itself.
Note : Mitsubishi Electric will continue the business operations of high frequency & optical devices
and power devices.
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
DESCRIPTION
The 38C8 group is the 8-bit microcomputer based on the 740 family
core technology.
The 38C8 group has a LCD drive control circuit (bias control, time
sharing control), a 10-bit A-D converter, and a Serial I/O as additional
functions.
The various microcomputers in the 38C8 group include variations of
internal memory type and packaging. For details, refer to the section
on part numbering.
FEATURES
●Basic machine-language instructions ....................................... 71
●The minimum instruction execution time ............................ 0.5 µs
(at 8 MHz oscillation frequency)
●Memory size
ROM ............................................................................ 60 K bytes
RAM ............................................................................ 2048 bytes
●Programmable input/output ports ............................................. 35
●Software pull-up resistors
.................................................................. Ports P0–P3, P41–P47
●Interrupts ................................................... 14 sources, 14 vectors
(includes key input interrupt)
●Timers ............................................................ 8-bit ✕ 3, 16-bit ✕ 2
●Serial I/O ........................ 8-bit ✕ 1 (UART or Clock-synchronized)
●A-D converter (32 kHz operating available) ... 10-bit ✕ 8 channels
●LCD drive control circuit
Bias ................................................................................... 1/5, 1/7
Duty .............................................................................. 1/16, 1/32
Common output ............................................................... 16 or 32
Segment output ............................................................... 52 or 68
●Main clock generating circuit (RC oscillation selectable)
...................... (connect to external ceramic resonator or resistor)
●Sub-clock generating circuit
............................... (connect to external quartz-crystal oscilaltor)
●Power source voltage
In high-speed mode .................................................... 4.0 to 5.5 V
In middle-speed mode ................................................ 2.2 to 5.5 V
In low-speed mode ..................................................... 2.2 to 5.5 V
●Power dissipation
In high-speed mode ........................................................... 30 mW
(at 8 MHz oscillation frequency, at 5 V power source voltage)
In low-speed mode ............................................................. 60 µW
(at 32 kHz oscillation frequency, at 3 V power source voltage, at
WIT state, at voltage multiplier operating, LCD drive waveform
generating state)
●Operating temperature range ................................... – 20 to 85°C
APPLICATIONS
Dot-matrix-type LCD displays
1
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
75
74
73
77
76
82
81
80
79
78
84
83
85
87
86
92
91
90
89
88
95
94
93
109
72
71
70
110
111
112
113
69
68
67
114
115
116
66
65
64
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
M38C89MF-XXXFP
141
142
143
39
38
37
36
33
34
35
30
31
32
27
28
29
25
26
24
22
23
19
20
21
16
17
18
COM5
COM4
COM3
COM2
COM1
COM0
VL1
VL2
VL3
VL4
VL5
C3
C2
C1
VLIN
VSS (NC)
NC
VSS
P27
P26
P25
P24
P23
P22
P21
P20
P47/SRDY
P46/SCLK
P45/TXD
P44/RXD
P43/CNTR1/BEEPP42/CNTR0/BEEP+
P41/INT1/ADT
P40/INT0
P07
P06
13
14
15
144
1
2
3
4
5
6
7
8
9
10
11
12
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7/COM23
SEG6/COM22
SEG5/COM21
SEG4/COM20
SEG3/COM19
SEG2/COM18
SEG1/COM17
SEG0/COM16
COM7
COM6
101
100
99
98
97
96
108
107
106
105
104
103
102
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60/COM31
SEG61/COM30
SEG62/COM29
SEG63/COM28
SEG64/COM27
SEG65/COM26
SEG66/COM25
SEG67/COM24
COM15
COM14
PIN CONFIGURATION (TOP VIEW)
Package type : 144P6Q-A
Fig. 1 M38C89MF-XXXFP pin configuration
2
COM13
COM12
COM11
COM10
COM9
COM8
P30/AIN0
P31/AIN1
P32/AIN2
P33/AIN3
NC
XIN
NC
VSS
XOUT
OSCSEL
VCC
NC
XCIN
XCOUT
NC
RESET
P10/AIN4
P11/AIN5
P12/AIN6
P13/AIN7
P14
P15
P16
P17
P00
P01
P02
P03
P04
P05
Fig. 2 Functional block diagram
FUNCTIONAL BLOCK DIAGRAM (Package: 144P6Q-A)
Sub-clock
input
RC
Sub-clock
Clock Clock oscillation
output
input output select
XIN
61
XOUT OSCSEL XCIN
57
58
Reset input
RESET
XCOUT
54
53
51
VCC
VSS
VSS
56
59
18
COM0
COM1
COM2
3 COM3
2 COM4
1 COM5
144 COM6
143 COM7
142
SEG0/COM16
141
SEG1/COM17
140
SEG2/COM18
139
SEG3/COM19
138
SEG4/COM20
137 SEG5/COM21
136
SEG6/COM22
135
SEG7/COM23
134
SEG8
133 SEG9
132 SEG10
131 SEG11
130
SEG12
6
5
Data bus
4
CPU
Clock generating circuit
A
RAM
ROM
X
φ
LCD RAM
(240 byte)
Y
LCD
controller
S
PCH
Timer
PCL
Timer X (16)
PS
Timer Y (16)
Timer 1 (8)
Timer 2 (8)
Timer 3 (8)
87 SEG55
86 SEG56
27 28 29 30 31 32 33 34
63 64 65 66
I/O port P3
P0 (8)
35 36 37 38 39 40 41 42
I/O port P0
CNTR0, CNTR1
82 SEG60/COM31
Key-on wake-up
P1 (8)
P2 (8)
43 44 45 46 47 48 49 50
19 20 21 22 23 24 25 26
I/O port P1
SEG61/COM30
SEG62/COM29
SEG63/COM28
78 SEG64/COM27
77 SEG65/COM26
76 SEG66/COM25
75 SEG67/COM24
74 COM15
73 COM14
72 COM13
71 COM12
70 COM11
69 COM10
68 COM9
67 COM8
80
I/O port P2
79
15
14
13
12
VLIN
C1
C2
C3
11
10
9
8
7
VL1 VL2 VL3 VL4 VL5
3
38C8 Group
I/O port P4
P3 (4)
83 SEG59
81
MITSUBISHI MICROCOMPUTERS
P4 (7)
INT0, INT1
A-D converter (10)
84 SEG58
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Serial I/O (8)
85 SEG57
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Table 1 Pin description
Pin
Name
VCC, VSS
RESET
XIN
Power source
Reset input
Clock input
XOUT
Clock output
OSCSEL
RC oscillation
select
Sub-clock input
Sub-clock output
XCIN
XCOUT
VLIN
VL1 – VL5
COM0 –
COM15
SEG0/COM16–
SEG7/COM23,
SEG60COM31–
SEG67/COM24
SEG8–SEG59
P00–P07
P14–P17
P10/AIN4–
P13/AIN7
P20–P27
P30/AIN0 –
P33/AIN3
P40/INT0
Power source
input for LCD
LCD power
source
Common output
Function except a port function
• Apply voltage of 4.0–5.5 V to VCC, and 0 V to VSS. (at high-speed mode)
• Reset input pin for active “L.”
• Input and output pins for the main clock generating circuit.
• Feedback resistor is built in between XIN pin and XOUT pin.
• Connect a ceramic resonator or a quartz-crystal oscillator between the XIN and XOUT pins to set the
oscillation frequency.
• If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open.
• This pin determines the oscillation between XIN and XOUT. The oscillation method can be selected from
either by an oscillator or by a resistor.
• Input and output pins for sub-clock generating circuit. (Connect a quartz-crystal oscillator between the
XCIN and XCOUT pins to set the oscillation frequency. The clock generated the externals cannot be input
directly.)
• Reference voltage input pin for LCD.
• The input voltage to this pin is boosted threefold by voltage multiplier.
• LCD drive power source pins.
• LCD common output pins.
Segment output/
Common output
• LCD segment/common output pins.
Segment output
I/O port P0
I/O port P1
• LCD segment output pins.
• 8-bit I/O port.
• CMOS compatible input level.
• CMOS 3-state output structure.
I/O port P2
I/O port P3
Input port P4
P41/INT1/ADT I/O port P4
P42/CNTR0/
BEEP+,
P43/CNTR1/
BEEPP44/RxD,
P45/TxD,
P46/SCLK,
P47/SRDY
C1,
Voltage multiplier
C2,
C3
VSS (NC), NC
4
Function
• 4-bit I/O port.
• CMOS compatible input level.
• CMOS 3-state output structure.
• 1-bit input port.
• CMOS compatible input level.
• 7-bit I/O port.
• CMOS compatible input level.
• CMOS 3-state output structure.
• I/O direction register allows each pin to be individually
programmed as either input or output.
• A-D converter analog input pin
• Key-on wake-up interrupt input pin
• A-D converter analog input pin
• External interrupt pin
• External interrupt pin
• A-D trigger input pin
•Timer function I/O pin
• Serial I/O I/O pin
• External capacitor connect pins for a voltage multiplier of LCD.
• Non-function pins.
• Leave the VSS (NC) pin open.
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PART NUMBERING
Product
M38C8
9
M
F
–XXX
FP
Package type
FP: 144P6Q-A package
ROM number
Omitted in One Time PROM version.
ROM/PROM size
1: 4096 bytes
9: 36864 bytes
2: 8192 bytes
A: 40960 bytes
3: 12288 bytes B: 45056 bytes
4: 16384 bytes C: 49152 bytes
5: 20480 bytes D: 53248 bytes
6: 24576 bytes E: 57344 bytes
7: 28672 bytes F: 61440 bytes
8: 32768 bytes
The first 128 bytes and the last 2 bytes of ROM
are reserved areas; they cannot be used.
Memory type
M: Mask ROM version
E: One Time PROM version
RAM size
0: 192 bytes
1: 256 bytes
2: 384 bytes
3: 512 bytes
4: 640 bytes
5: 768 bytes
6: 896 bytes
7: 1024 bytes
8: 1536 bytes
9: 2048 bytes
Fig. 3 Part numbering
5
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
GROUP EXPANSION
Packages
Mitsubishi plans to expand the 38C8 group as follows.
144P6Q-A ................................... 0.5 mm-pitch plastic molded QFP
Memory Type
Support for mask ROM and One Time PROM versions
Memory Size
ROM/PROM size ............................................................ 60 K bytes
RAM size ........................................................................ 2048 bytes
Memory Expansion Plan
ROM size (bytes)
M38C89MF/EF
60K
56K
48K
40K
32K
28K
24K
20K
16K
12K
8K
4K
192 256
384
512
640
768
896
1,024
1,536
2,048
RAM size (bytes)
Fig. 4 Memory expansion plan
Currently products are listed below.
Table 2 List of products
Product name
M38C89MF-XXXFP
M38C89EFFP
6
(P) ROM size (bytes)
ROM size for User in ( )
61440 (61310)
61440 (61310)
RAM size
(bytes)
2048
2048
Package
144P6Q-A
144P6Q-A
Remarks
Mask ROM version
One Time PROM version
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
[Stack Pointer (S)]
FUNCTIONAL DESCRIPTION
CENTRAL PROCESSING UNIT (CPU)
The accumulator is an 8-bit register. Data operations such as data
transfer, etc., are executed mainly through the accumulator.
The stack pointer is an 8-bit register used during subroutine calls
and interrupts. This register indicates start address of stored area
(stack) for storing registers during subroutine calls and interrupts.
The low-order 8 bits of the stack address are determined by the contents of the stack pointer. The high-order 8 bits of the stack address
are determined by the stack page selection bit. If the stack page
selection bit is “0” , the high-order 8 bits becomes “0016”. If the stack
page selection bit is “1”, the high-order 8 bits becomes “0116”.
The operations of pushing register contents onto the stack and popping them from the stack are shown in Figure 6.
Store registers other than those described in Figure 6 with program
when the user needs them during interrupts or subroutine calls.
[Index Register X (X)]
[Program Counter (PC)]
The index register X is an 8-bit register. In the index addressing modes,
the value of the OPERAND is added to the contents of register X and
specifies the real address.
The program counter is a 16-bit counter consisting of two 8-bit registers PCH and PCL. It is used to indicate the address of the next instruction to be executed.
The 38C8 group uses the standard 740 family instruction set. Refer
to the table of 740 family addressing modes and machine instructions or the 740 Family Software Manual for details on the instruction
set.
Machine-resident 740 family instructions are as follows:
The FST and SLW instruction cannot be used.
The STP, WIT, MUL, and DIV instruction can be used.
[Accumulator (A)]
[Index Register Y (Y)]
The index register Y is an 8-bit register. In partial instruction, the
value of the OPERAND is added to the contents of register Y and
specifies the real address.
b0
b7
A
Accumulator
b0
b7
X
Index register X
b0
b7
Y
b7
Index register Y
b0
S
b15
b7
PCH
Stack pointer
b0
Program counter
PCL
b7
b0
N V T B D I Z C
Processor status register (PS)
Carry flag
Zero flag
Interrupt disable flag
Decimal mode flag
Break flag
Index X mode flag
Overflow flag
Negative flag
Fig. 5 740 Family CPU register structure
7
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
On-going Routine
Interrupt request
(Note)
M (S)
Execute JSR
Push return address
on stack
M (S)
(PCH)
(S)
(S) – 1
M (S)
(PCL)
(S)
(S)– 1
(S)
M (S)
(S)
M (S)
(S)
Subroutine
(S)
(S) + 1
(PCL)
M (S)
(S)
(S) + 1
(PCH)
M (S)
(S) – 1
(PCL)
(PS)
Push contents of processor
status register on stack
(S) – 1
Execute RTI
Note: Condition for acceptance of an interrupt
Push return address
on stack
(S) – 1
Interrupt
Service Routine
Execute RTS
POP return
address from stack
(PCH)
(S)
(S) + 1
(PS)
M (S)
(S)
(S) + 1
(PCL)
M (S)
(S)
(S) + 1
(PCH)
M (S)
I Flag is set from “0” to “1”
Fetch the jump vector
POP contents of
processor status
register from stack
POP return
address
from stack
Interrupt disable flag is “0” and
Interrupt enable bit corresponding to
each interrupt is “1”
Fig. 6 Register push and pop at interrupt generation and subroutine call
Table 3 Push and pop instructions of accumulator or processor status register
8
Push instruction to stack
Pop instruction from stack
Accumulator
PHA
PLA
Processor status register
PHP
PLP
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
[Processor status register (PS)]
The processor status register is an 8-bit register consisting of 5 flags
which indicate the status of the processor after an arithmetic operation and 3 flags which decide MCU operation. Branch operations can
be performed by testing the Carry (C) flag , Zero (Z) flag, Overflow
(V) flag, or the Negative (N) flag. In decimal mode, the Z, V, N flags
are not valid.
•Bit 0: Carry flag (C)
The C flag contains a carry or borrow generated by the arithmetic
logic unit (ALU) immediately after an arithmetic operation. It can
also be changed by a shift or rotate instruction.
•Bit 1: Zero flag (Z)
The Z flag is set if the result of an immediate arithmetic operation
or a data transfer is “0”, and cleared if the result is anything other
than “0”.
•Bit 2: Interrupt disable flag (I)
The I flag disables all interrupts except for the interrupt
generated by the BRK instruction.
Interrupts are disabled when the I flag is “1”.
•Bit 3: Decimal mode flag (D)
The D flag determines whether additions and subtractions are
executed in binary or decimal. Binary arithmetic is executed when
this flag is “0”; decimal arithmetic is executed when it is “1”.
Decimal correction is automatic in decimal mode. Only the ADC
and SBC instructions can be used for decimal arithmetic.
•Bit 4: Break flag (B)
The B flag is used to indicate that the current interrupt was
generated by the BRK instruction. The BRK flag in the processor
status register is always “0”. When the BRK instruction is used to
generate an interrupt, the processor status register is pushed
onto the stack with the break flag set to “1”.
•Bit 5: Index X mode flag (T)
When the T flag is “0”, arithmetic operations are performed
between accumulator and memory. When the T flag is “1”, direct
arithmetic operations and direct data transfers are enabled
between memory locations.
•Bit 6: Overflow flag (V)
The V flag is used during the addition or subtraction of one byte
of signed data. It is set if the result exceeds +127 to -128. When
the BIT instruction is executed, bit 6 of the memory location
operated on by the BIT instruction is stored in the overflow flag.
•Bit 7: Negative flag (N)
The N flag is set if the result of an arithmetic operation or data
transfer is negative. When the BIT instruction is executed, bit 7 of
the memory location operated on by the BIT instruction is stored
in the negative flag.
Table 4 Set and clear instructions of each bit of processor status register
Set instruction
Clear instruction
C flag
Z flag
I flag
D flag
B flag
T flag
V flag
N flag
SEC
–
SEI
SED
–
–
CLC
–
CLI
CLD
–
SET
CLT
–
–
CLV
9
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
[CPU Mode Register (CPUM)] 003B16
The CPU mode register contains the stack page selection bit and the
internal system clock selection bit.
The CPU mode register is allocated at address 003B16.
b7
b0
CPU mode register
(CPUM (CM) : address 003B16)
Processor mode bits
b1 b0
0 0 : Single-chip mode
0 1 :
1 0 : Not available
1 1 :
Stack page selection bit
0 : 0 page
1 : 1 page
Not used (returns “1” when read)
(Do not write “0” to this bit)
Sub-clock (XCIN–XCOUT) oscillating bit
0 : Stopped
1 : Oscillating
Main clock (XIN–XOUT) stop bit
0 : Oscillating
1 : Stopped
Main clock division ratio selection bit
0 : f(XIN)/2 (high-speed mode)
1 : f(XIN)/8 (middle-speed mode)
Internal system clock selection bit
0 : XIN–XOUT selected (middle-/high-speed mode)
1 : XCIN–XCOUT selected (low-speed mode)
Fig. 7 Structure of CPU mode register
10
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MEMORY
Special Function Register (SFR) Area
The Special Function Register area in the zero page contains control
registers such as I/O ports and timers.
Zero Page
Access to this area with only 2 bytes is possible in the zero page
addressing mode.
Special Page
RAM
RAM is used for data storage and for stack area of subroutine calls
and interrupts.
Access to this area with only 2 bytes is possible in the special page
addressing mode.
ROM
The first 128 bytes and the last 2 bytes of ROM are reserved for
device testing and the rest is user area for storing programs.
Interrupt Vector Area
The interrupt vector area contains reset and interrupt vectors.
RAM area
RAM size
(bytes)
000016
Address
XXXX16
192
00FF16
256
013F16
384
01BF16
512
023F16
640
02BF16
768
033F16
896
03BF16
1024
043F16
1536
063F16
2048
083F16
SFR area
004016
Zero page
LCD display RAM area✽
RAM
013016
XXXX16
034016
LCD display RAM area✽
043016
ROM area
ROM size
(bytes)
Address
YYYY16
Address
ZZZZ16
084016
4096
F00016
F08016
YYYY16
8192
E00016
E08016
12288
D00016
D08016
16384
C00016
C08016
20480
B00016
B08016
24576
A00016
A08016
28672
900016
908016
32768
800016
808016
36864
700016
708016
40960
600016
608016
45056
500016
508016
49152
400016
408016
53248
300016
308016
57344
200016
208016
61440
100016
108016
Not used
Reserved ROM area
(128 bytes)
ZZZZ16
ROM
FF0016
FFDC16
Interrupt vector area
Special page
FFFE16
FFFF16
Reserved ROM area
✽ The start address of the LCD display area can be switched either zero page (addresses 004016–012F16) or 3 page (addresses
034016 –042F16) by software. Immediately after reset released, 3 page is selected.
Fig. 8 Memory map diagram
11
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
000016 Port P0 (P0)
000116 Port P0 direction register (P0D)
000216 Port P1 (P1)
000316 Port P1 direction register (P1D)
002016 Timer X (low-order) (TXL)
002116 Timer X (high-order) (TXH)
002216 Timer Y (low-order) (TYL)
002316 Timer Y (high-order) (TYH)
000416 Port P2 (P2)
000516 Port P2 direction register (P2D)
000616 Port P3 (P3)
000716 Port P3 direction register (P3D)
000916 Port P4 direction register (P4D)
002416 Timer 1 (T1)
002516 Timer 2 (T2)
002616 Timer 3 (T3)
002716 Timer X mode register (TXM)
002816 Timer Y mode register (TYM)
002916 Timer 123 mode register (T123M)
000A16
002A16
000B16
002B16
000C16
000D16
002C16
000E16
002E16
000F16
001016
002F16
000816 Port P4 (P4)
001116
001216
001316
001416
001516
001616 PULL register A (PULLA)
001716 PULL register B (PULLB)
001816 Transmit/Receive buffer register (TB/RB)
001916 Serial I/O status register (SIOSTS)
001A16 Serial I/O control register (SIOCON)
001B16 UART control register (UARTCON)
001C16 Baud rate generator (BRG)
001D16
001E16
001F16
Fig. 9 Memory map of special function register (SFR)
12
002D16
003016
003116 A-D control register (ADCON)
003216 A-D conversion register (low-order) (ADL)
003316 A-D conversion register (high-order) (ADH)
003416
003516
003616
003716 LCD control register 1 (LC1)
003816 LCD control register 2 (LC2)
003916 LCD mode register (LM)
003A16 Interrupt edge selection register (INTEDGE)
003B16 CPU mode register (CPUM)
003C16 Interrupt request register 1 (IREQ1)
003D16 Interrupt request register 2 (IREQ2)
003E16 Interrupt control register 1 (ICON1)
003F16 Interrupt control register 2 (ICON2)
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
I/O PORTS
[Direction Registers]
The I/O ports P0–P3 and P41–P47 have direction registers which
determine the input/output direction of each individual pin. Each bit
in a direction register corresponds to one pin, each pin can be set to
be input port or output port.
When “0” is written to the bit corresponding to a pin, that pin becomes an input pin. When “1” is written to that bit, that pin becomes
an output pin.
If data is read from a pin set to output, the value of the port output
latch is read, not the value of the pin itself. Pins set to input are floating. If a pin set to input is written to, only the port output latch is
written to and the pin remains floating.
Pull-up Control
By setting the PULL register A (address 001616) or the PULL register
B (address 001716), ports P0 to P4 except for port P40 can control
pull-up with a program.
However, the contents of PULL register A and PULL register B do not
affect ports programmed as the output ports.
b7
b0
PULL register A
(PULLA: address 001616)
P00–P03 pull-up
P04–P07 pull-up
P10–P13 pull-up
P14–P17 pull-up
P20–P23 pull-up
P24–P27 pull-up
P30–P33 pull-up
Not used (return “0” when read)
b7
b0
PULL register B
(PULLB: address 001716)
Not used (return “0” when read)
P41 pull-up
P42 pull-up
P43 pull-up
P44 pull-up
P45 pull-up
P46 pull-up
P47 pull-up
0: No pull-up
1: Pull-up
Note: The contents of PULL register A and PULL register B do
not affect ports programmed as the output port.
Fig. 10 Structure of PULL register A and PULL register B
13
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 5 List of I/O port function
Pin
P00–P07
P10/AIN4–
P13/AIN7
P14–P17
P20–P27
Name
Port P0
Port P1
Input/Output
Input/Output,
individual bits
I/O format
CMOS compatible input
level
CMOS 3-state output
Port P2
Input/Output,
individual bits
P30/AIN0–
P33/AIN3
Port P3
Input/Output,
individual bits
CMOS compatible input
level
CMOS 3-state output
CMOS compatible input
level
CMOS 3-state output
Key input (key-on
wake-up) interrupt input
A-D converter input
P40/INT0
Port P4
Input
CMOS compatible input
level
CMOS compatible input
level
CMOS 3-state output
External interrupt input
P41/INT1/ADT
P42/CNTR0/
BEEP+
P43/CNTR1/
BEEPP44/RxD
P45/TxD
P46/SCLK
P47/SRDY
COM0–COM7,
COM8–COM15
SEG0/COM16–
SEG7/COM23,
SEG60/COM31–
SEG67/COM24
SEG8–SEG59
14
Input/Output,
individual bits
Non-port function
A-D converter input
Timer X function I/O
Timer Y function I/O
Serial I/O funtion
I/O
Common
Output
LCD common output
Segment/
Common
LCD segment output
LCD common ouput
Segment
LCD segment output
Related SFRs
PULL register A
PULL register A
A-D control register
PULL register A
PULL register A
Interrupt control register 2
Ref. No.
(1)
(2)
(1)
(1)
PULL register A
A-D control register
(2)
PULL register B
Interrupt edge select
register
PULL register B
Timer X mode register
PULL register B
Timer Y mode register
PULL register B
Serial I/O control register
Serial I/O status register
UART control register
LCD mode register
(3)
(1)
(4)
(5)
(6)
(7)
(8)
(9)
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(2) Ports P10–P13, P3
(1) Ports P0, P14–P17, P2, P41
Pull-up control
Pull-up control
Direction
register
Direction
register
Data bus
Port latch
Data bus
Port latch
A-D converter input
Analog input pin selection bit
Key-on wake-up interrupt input
INT1 interrupt input, ADT
Except P0, P14–P17
(3) Port P40
Data bus
INT0 interrupt input
(4) Port P42
(5) Port P43
Pull-up control
Pull-up control
Direction
register
Data bus
Direction
register
Port latch
Data bus
Buzzer output mode
Timer output
Port latch
Buzzer output mode
Timer output
CNTR0 interrupt input
CNTR1 interrupt input
Fig. 11 Port block diagram (1)
15
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(6) Port P44
(7) Port P45
Pull-up control
Serial I/O enable bit
Receive enalble bit
Direction
register
Port latch
Data bus
Databus
Serial I/O input
(9) Port P47
Serial I/O synchronous
clock selection bit
Serial I/O enable bit
Pull-up control
Serial I/O mode selection bit
Serial I/O enable bit
Direction
register
Port latch
Serial I/O ready output
Serial I/O clock input
Fig. 12 Port block diagram (2)
Serial I/O mode selection bit
Serial I/O enable bit
SRDY output enable bit
Direction
register
Data bus
Port latch
Serial I/O clock output
16
Port latch
Serial I/O output
(8) Port P46
Data bus
Pull-up control
P45/TxD P-channel output disable bit
Serial I/O enable bit
Transmit enable bit
Direction
register
Pull-up control
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
INTERRUPTS
Interrupt Operation
Interrupts occur by fourteen sources: five external, eight internal, and
one software.
By acceptance of an interrupt, the following operations are automatically performed:
1. The contents of the program counter and processor status register are automatically pushed onto the stack.
2. The interrupt disable flag is set and the corresponding interrupt
request bit is cleared.
3. The interrupt jump destination address is read from the vector
table into the program counter.
Interrupt Control
Each interrupt except the BRK instruction interrupt have both an interrupt request bit and an interrupt enable bit, and is controlled by the
interrupt disable flag. An interrupt occurs if the corresponding interrupt request and enable bits are “1” and the interrupt disable flag is
“0”.
Interrupt enable bits can be set or cleared by software. Interrupt request bits can be cleared by software, but cannot be set by software.
The BRK instruction interrupt and reset cannot be disabled with any
flag or bit. The I flag disables all interrupts except the BRK instruction
interrupt and reset. If several interrupts requests occurs at the same
time the interrupt with highest priority is accepted first.
■Notes on interrupts
When setting the followings, the interrupt request bit may be set to
“1”.
•When setting external interrupt active edge
Related register: Interrupt edge selection register (address 3A16)
Timer X mode register (address 2716)
Timer Y mode register (address 2816)
•When switching interrupt sources of an interrupt vector address
where two or more interrupt sources are allocated
Related register: A-D control regsiter (address 3116)
When not requiring for the interrupt occurrence synchronized with
these setting, take the following sequence.
➀Set the corresponding interrupt enable bit to “0” (disabled).
➁Set the interrupt edge select bit (active edge switch bit) or the interrupt source select bit to “1”.
➂Set the corresponding interrupt request bit to “0” after 1 or more
instructions have been executed.
➃Set the corresponding interrupt enable bit to “1” (enabled).
Table 6 Interrupt vector addresses and priority
Vector Addresses (Note 1)
Interrupt Source Priority
High
Low
Reset (Note 2)
1
FFFD16
FFFC16
INT0
2
FFFB16
FFFA16
Interrupt Request
Generating Conditions
Remarks
At reset
At detection of either rising or falling edge of
INT0 intput
At detection of either rising or falling edge of
INT1 input
At completion of serial I/O data reception
Non-maskable
External interrupt
(active edge selectable)
External interrupt
(active edge selectable)
Valid when serial I/O is selected
Valid when serial I/O is selected
INT1
3
FFF916
FFF816
Serial I/O
reception
Serial I/O
transmission
Timer X
Timer Y
Timer 2
Timer 3
CNTR0
4
FFF716
FFF616
5
FFF516
FFF416
6
7
8
9
10
FFF316
FFF116
FFEF16
FFED16
FFEB16
FFF216
FFF016
FFEE16
FFEC16
FFEA16
CNTR1
11
FFE916
FFE816
Timer 1
Key input (Keyon wake-up)
A-D conversion
12
13
FFE716
FFE116
FFE616
FFE016
14
FFDF16
FFDE16
At completion of serial I/O transmission shift
or when transmission buffer is empty
At timer X underflow
At timer Y underflow
At timer 2 underflow
At timer 3 underflow
At detection of either rising or falling edge of
CNTR0 input
At detection of either rising or falling edge of
CNTR1 input
At timer 1 underflow
At falling of port P2 (at input) input logical level
AND
At completion of A-D conversion
BRK instruction
15
FFDD16
FFDC16
At BRK instruction execution
External interrupt
(active edge selectable)
External interrupt
(active edge selectable)
External interrupt
(falling valid)
Valid when A-D conversion interrupt
is selected
Non-maskable software interrupt
Notes 1: Vector addresses contain interrupt jump destination addresses.
2: Reset function in the same way as an interrupt with the highest priority.
17
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Interrupt request bit
Interrupt enable bit
Interrupt disable flag (I)
Interrupt request
BRK instruction
Reset
Fig. 13 Interrupt control
b7
b0
Interrupt edge selection register
(INTEDGE : address 003A16)
INT0 interrupt edge selection bit
INT1 interrupt edge selection bit
Not used (return “0” when read)
b7
b0
0 : Falling edge active
1 : Rising edge active
Interrupt request register 1
(IREQ1 : address 003C16)
b7
INT0 interrupt request bit
INT1 interrupt request bit
Serial I/O receive interrupt request bit
Serial I/O transmit interrupt request bit
Timer X interrupt request bit
Timer Y interrupt request bit
Timer 2 interrupt request bit
Timer 3 interrupt request bit
b7
b0
INT0 interrupt enable bit
INT1 interrupt enable bit
Serial I/O receive interrupt enable bit
Serial I/O transmit interrupt enable bit
Timer X interrupt enable bit
Timer Y interrupt enable bit
Timer 2 interrupt enable bit
Timer 3 interrupt enable bit
Interrupt request register 2
(IREQ2 : address 003D16)
CNTR0 interrupt request bit
CNTR1 interrupt request bit
Timer 1 interrupt request bit
Not used (returns “0” when read)
Key input interrupt request bit
A-D conversion interrupt request bit
Not used (returns “0” when read)
0 : No interrupt request issued
1 : Interrupt request issued
b7
Interrupt control register 1
(ICON1 : address 003E16)
b0
b0
Interrupt control register 2
(ICON2 : address 003F16)
CNTR0 interrupt enable bit
CNTR1 interrupt enable bit
Timer 1 interrupt enable bit
Not used (returns “0” when read)
(Do not write “1” to this bit)
Key input interrupt enable bit
A-D conversion interrupt enable bit
Not used (returns “0” when read)
(Do not write “1” to this bit)
0 : Interrupts disabled
1 : Interrupts enabled
Fig. 14 Structure of interrupt-related registers
18
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Key Input Interrupt (Key-on Wake-Up)
A key input interrupt request is generated by applying “L” level to any
pin of port P2 that have been set to input mode. In other words, it is
generated when AND of input level goes from “1” to “0”. An example
Port PXx
“L” level output
of using a key input interrupt is shown in Figure 15, where an interrupt request is generated by pressing one of the keys consisted as
an active-low key matrix which inputs to ports P20–P23.
PULL register A
Bit 5 = “1”
Port P27 direction
register = “1”
✽
✽✽
Key input interrupt request
Port P27
latch
P27 output
Port P26 direction
register = “1”
✽
✽✽
Port P26
latch
P26 output
✽
Port P25 direction
register = “1”
✽✽
Port P25
latch
P25 output
Port P24 direction
register = “1”
✽
✽✽
Port P24
latch
P24 output
PULL register A
Bit 4 = “1”
✽
✽✽
✽
✽✽
P23 input
Port P23 direction
register = “0”
Port P2
Input reading circuit
Port P23
latch
Port P22 direction
register = “0”
P22 input
Port P22
latch
Port P21 direction
register = “0”
✽
✽✽
P21 input
Port P21
latch
Port P20 direction
register = “0”
✽
P20 input
✽✽
Port P20
latch
✽ P-channel transistor
✽✽ CMOS output buffer
for pull-up
Fig. 15 Connection example when using key input interrupt and port P2 block diagram
19
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
TIMERS
is set to “1”.
Read and write operation on 16-bit timer must be performed for both
high and low-order bytes. When reading a 16-bit timer, read the highorder byte first. When writing to a 16-bit timer, write the low-order
byte first. The 16-bit timer cannot perform the correct operation when
reading during the write operation, or when writing during the read
operation.
The 38C8 group has five timers: timer X, timer Y, timer 1, timer 2, and
timer 3. Timer X and timer Y are 16-bit timers, and timer 1, timer 2,
and timer 3 are 8-bit timers.
All timers are down count timers. When the timer reaches “0016”, an
underflow occurs at the next count pulse and the corresponding timer
latch is reloaded into the timer and the count is continued. When a
timer underflows, the interrupt request bit corresponding to that timer
Data bus
f(XIN)/16
(f(XCIN)/16 in low-speed mode✽)
f(XIN)
“00”,“11”
f(XCIN)
Timer X count source
“1” selection bit
“0 ”
“01”
Timer X operating
CNTR0 active
mode bits
edge switch bit
“0 ”
P42/CNTR0/BEEP+
Timer X operating
mode bits
Timer X write control bit
Timer X stop control bit
“00”,“01”,“11”
Timer X (low) latch (8)
Timer X (high) latch (8)
Timer X (low) (8)
Timer X (high) (8)
Timer X interrupt
request
“10”
“1 ”
Pulse width
measurement
mode
CNTR0 active
edge switch bit
CNTR0 interrupt
request
Buzzer output mode
“0”
S
Q
“1 ”
P42 direction register
Timer Y operating mode bits
T
“00”,“01”,“10”
Q
Pulse width HL continuously
measurement mode
P42 latch
Rising edge detection
Buzzer output mode
CNTR1 interrupt
request
“11”
Period measurement mode
Falling edge detection
f(XIN)/16
(f(XCIN)/16 in low-speed mode✽)
Timer Y stop
control bit
CNTR1 active
edge switch bit
“00”,“01”,“11”
Timer Y (low) latch (8)
Timer Y (low) high (8)
Timer Y (low) (8)
Timer Y (high) (8)
“0 ”
P43/CNTR1/BEEP-
Timer Y interrupt
request
“10” Timer Y operating
mode bits
“1”
P43 direction register
P43 latch
BEEP- valid bit
f(XIN)/16
(f(XCIN)/16 in low-speed mode✽)
Timer 1 count source
selection bit “0”
Timer 1 latch (8)
Timer 2 (8)
“1 ”
Timer 1 interrupt
request
Timer 2 latch (8)
“0”
Timer 1 (8)
f(XCIN)/32
Timer 2 write control bit
Timer 2 count source
selection bit
“1 ”
Timer 2 interrupt
request
f(XIN)/16
(f(XCIN)/16 in low-speed mode✽)
“0”
Timer 3 latch (8)
Timer 3 (8)
f(XCIN)/32
“1 ”
Timer 3 count source
selection bit
✽ Internal clock φ = XCIN divided by 2 in low-speed mode
Fig. 16 Timer block diagram
20
Timer 3 interrupt
request
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Timer X
Timer X is a 16-bit timer that can be selected in one of four modes
and can be controlled the timer X write by setting the timer X mode
register.
(1) Timer Mode
When the timer X count source selection bit is “0”, the timer counts
f(XIN)/16 (or f(XCIN)/16 in low-speed mode). When it is “1”, the timer
counts f(XIN).
(2) Buzzer Output Mode
When the timer X count source selection bit is “0”, the timer counts
f(XCIN). When it is “1”, the timer counts f(XIN).
Each time the timer underflows, a signal output from the BEEP+ pin
is inverted. When the BEEP- valid bit is “1”, the opposite phase of
BEEP+ signal is output from the BEEP- pin. When using the BEEP+
pin and the BEEP- pin, set ports shared with these pins to output.
(3) Event Counter Mode
The timer counts signals input through the CNTR0 pin.
Except for this, the operation in event counter mode is the same as
in timer mode. When using a timer in this mode, set the port shared
with the CNTR0 pin to input.
b7
b0
Timer X mode register
(TXM : address 002716)
Timer X write control bit
0 : Write value in latch and counter
1 : Write value in latch only
BEEP- valid bit
0 : Invalid
1 : Valid
Not used
Timer X operating mode bits
b5 b4
0 0 : Timer mode
0 1 : Buzzer output mode
1 0 : Event counter mode
1 1 : Pulse width measurement mode
CNTR0 active edge switch bit
0 : Count at rising edge in event counter mode
Start from “H” output in buzzer output mode
Measure “H” pulse width in pulse width
measurement mode
Falling edge active for interrupt
1 : Count at falling edge in event counter mode
Start from “L” output in buzzer output mode
Measure “L” pulse width in pulse width
measurement mode
Rising edge active for interrupt
Timer X stop control bit
0 : Count start
1 : Count stop
(4) Pulse Width Measurement Mode
When the timer X count source selection bit is “0”, the count source
is f(XIN)/16 (or f(XCIN)/16 in low-speed mode). When it is “1”, the
count source is f(XIN).
If CNTR 0 active edge switch bit is “0”, the timer counts while the
input signal of CNTR0 pin is at “H”. If it is “1”, the timer counts while
the input signal of CNTR0 pin is at “L”. When using a timer in this
mode, set the port shared with the CNTR0 pin to input.
Fig. 17 Structure of timer X mode register
●Timer X write control
If the timer X write control bit is “0”, when the value is written in the
address of timer X, the value is loaded in the timer X and the latch
at the same time.
If the timer X write control bit is “1”, when the value is written in the
address of timer X, the value is loaded only in the latch. The value
in the latch is loaded in timer X after timer X underflows.
If the value is written in latch only, unexpected value may be set in
the high-order counter when the writing in high-order latch and the
underflow of timer X are performed at the same timing.
■Notes on CNTR0 interrupt active edge selection
CNTR0 interrupt active edge depends on the CNTR0 active edge
switch bit.
21
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Timer Y
Timer Y is a 16-bit timer that can be selected in one of four modes.
(1) Timer Mode
The timer counts f(XIN)/16 (or f(XCIN)/16 in low-speed mode).
(2) Period Measurement Mode
CNTR1 interrupt request is generated at rising/falling edge of CNTR1
pin input signal. Simultaneously, the value in timer Y latch is reloaded
in timer Y and timer Y continues counting down. Except for the abovementioned, the operation in period measurement mode is the same
as in timer mode.
The timer value just before the reloading at rising/falling of CNTR1
pin input signal is retained until the timer Y is read once after the
reload.
The rising/falling timing of CNTR1 pin input signal is found by CNTR1
interrupt. When using a timer in this mode, set the port shared with
the CNTR1 pin to input.
(3) Event Counter Mode
The timer counts signals input through the CNTR1 pin.
Except for this, the operation in event counter mode is the same as
in timer mode. When using a timer in this mode, set the port shared
with the CNTR1 pin to input.
(4) Pulse Width HL Continuously Measurement
Mode
CNTR1 interrupt request is generated at both rising and falling edges
of CNTR1 pin input signal. Except for this, the operation in pulse
width HL continuously measurement mode is the same as in period
measurement mode. When using a timer in this mode, set the port
shared with the CNTR1 pin to input.
■Notes on CNTR1 interrupt active edge selection
CNTR1 interrupt active edge depends on the CNTR1 active edge
switch bit. However, in the pulse width HL continuously measurement mode, CNTR1 interrupt request is generated at both rising and
falling edges of CNTR1 pin input signal regardless of the setting of
CNTR1 active edge switch bit.
22
b7
b0
Timer Y mode register
(TYM : address 002816)
Timer X count source selection bit
0 : f(XIN)/16 (f(XCIN)/16 in low-speed mode✽)
1 : f(XIN)
Not used (return “0” when read)
Timer Y operating mode bits
b5 b4
0 0 : Timer mode
0 1 : Period measurement mode
1 0 : Event counter mode
1 1 : Pulse width HL continuously
measurement mode
CNT R1 active edge switch bit
0 : Count at rising edge in event counter mode
Measure the falling edge to falling edge
period in period measurement mode
Interrupt falling edge active
1 : Count at falling edge in event counter mode
Measure the rising edge period in period
measurement mode
Interrupt rising edge active
Timer Y stop control bit
0 : Count start
1 : Count stop
✽ Internal clock φ in low-speed mode is XCIN divided by 2.
When the timer X operating mode bits are “00” or “11”, the timer X count source is
f(XCIN)/16. When the timer X operating mode bits are “01”, the timer X count source
is f(XCIN).
Fig. 18 Structure of timer Y mode register
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Timer 1, Timer 2, Timer 3
Timer 1, timer 2, and timer 3 are 8-bit timers. The count source for
each timer can be selected by the timer 123 mode register. The timer
latch value is not affected by a change of the count source. However,
because changing the count source may cause an inadvertent count
down of the timer. Therefore, rewrite the value of timer whenever the
count source is changed.
●Timer 2 write control
If the timer 2 write control bit is “0”, when the value is written in the
address of timer 2, the value is loaded in the timer 2 and the latch at
the same time.
If the timer 2 write control bit is “1”, when the value is written in the
address of timer 2, the value is loaded only in the latch. The value in
the latch is loaded in timer 2 after timer 2 underflows.
■Notes on timer 1 to timer 3
When the count source of timer 1 to 3 is changed, the timer counting
value may be changed large because a thin pulse is generated in
count input of timer. If timer 1 output is selected as the count source
of timer 2 or timer 3, when timer 1 is written, the counting value of
timer 2 or timer 3 may be changed large because a thin pulse is
generated in timer 1 output.
Therefore, set the value of timer in the order of timer 1, timer 2 and
timer 3 after the count source selection of timer 1 to 3.
b7
b0
Timer 123 mode register
(T123M :address 002916)
Not used
Timer 2 write control bit
0 : Write data in latch and counter
1 : Write data in latch only
Timer 2 count source selection bit
0 : Timer 1 output
1 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode*)
Timer 3 count source selection bit
0 : Timer 1 output
1 : f(XCIN)/32
Timer 1 count source selection bit
0 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode*)
1 : f(XCIN)/32
Not used (return “0” when read)
* Internal clock φ is XCIN/2 in the low-speed mode.
Fig. 19 Structure of timer 123 mode register
23
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
SERIAL I/O
(1) Clock Synchronous Serial I/O Mode
Serial I/O can be used as either clock synchronous or asynchronous
(UART) serial I/O. A dedicated timer (baud rate generator) is also
provided for baud rate generation.
Clock synchronous serial I/O can be selected by setting the mode
selection bit of the serial I/O control register to “1”.
For clock synchronous serial I/O, the transmitter and the receiver
must use the same clock. If an internal clock is used, transfer is started
by a write signal to the transmit/receive buffer registers.
Data bus
Receive buffer full flag (RBF)
Receive buffer register
Receive interrupt request (RI)
Receive shift register
P44/RXD
Address 001A16
Serial I/O control register
Address 001816
Shift clock
Clock control circuit
P46/SCLK
Serial I/O
clock selection bit
Frequency division ratio 1/(n+1)
BRG count source selection bit
f(XIN)
(f(XCIN) in low-speed mode)
1/4
P47/SRDY
F/F
Baud rate generator
1/4
Address 001C16
Clock control circuit
Falling-edge detector
Shift clock
P45/TXD
Transmit shift register
Transmit shift register shift completion flag (TSC)
Transmit interrupt source selection bit
Transmit interrupt request (TI)
Transmit buffer register
Address 001816
Transmit buffer empty flag (TBE)
Address 001916
Serial I/O status register
Data bus
Fig. 20 Block diagram of clock synchronous serial I/O
Transmit/receive shift clock
(1/2 to 1/2048 of internal clock,
or an external clock)
Serial output TXD
D0
D1
D2
D3
D4
D5
D6
D7
Serial input RXD
D0
D1
D2
D3
D4
D5
D6
D7
Receive enable signal SRDY
Write signal to receive/transmit
buffer register (address 001816)
TBE = 0
TBE = 1
TSC = 0
RBF = 1
TSC = 1
Overrun error (OE)
detection
Notes 1: The transmit interrupt (TI) can be selected to occur either when the transmit buffer register has emptied (TBE=1) or after
the transmit shift operation has ended (TSC=1), by setting the transmit interrupt source selection bit (TIC) of the serial
I/O control register.
2: If data is written to the transmit buffer register when TSC=0, the transmit clock is generated continuously and serial data
is output continuously from the TXD pin.
3: The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes “1” .
Fig. 21 Operation of clock synchronous serial I/O function
24
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(2) Asynchronous Serial I/O (UART) Mode
but the two buffers have the same address in memory. Since the shift
register cannot be written to or read from directly, transmit data is
written to the transmit buffer, and receive data is read from the receive buffer.
The transmit buffer can also hold the next data to be transmitted, and
the receive buffer register can hold a character while the next character is being received.
Clock asynchronous serial I/O mode (UART) can be selected by clearing the serial I/O mode selection bit of the serial I/O control register
to “0”.
Eight serial data transfer formats can be selected, and the transfer
formats used by a transmitter and receiver must be identical.
The transmit and receive shift registers each have a buffer register,
Data bus
Address 001816
Serial I/O control register
P44/RXD
Address 001A16
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Receive buffer register
OE
Character length selection bit
STdetector
7 bits
Receive shift register
1/16
8 bits
PE FE
UART control register
Address 001B16
SP detector
Clock control circuit
Serial I/O clock selection bit
P46/SCLK
BRG count source selection bit
Frequency division ratio 1/(n+1)
f(XIN)
(f(XCIN) in lowspeed mode)
Baud rate generator
Address 001C16
1/4
ST/SP/PA generator
Transmit shift register shift completion flag (TSC)
1/16
Transmit shift register
P45/TXD
Character length selection bit
Transmit buffer register
Address 001816
Transmit interrupt source selection bit
Transmit interrupt request (TI)
Transmit buffer empty flag (TBE)
Serial I/O status register Address 001916
Data bus
Fig. 22 Block diagram of UART serial I/O
Transmit or receive clock
Transmit buffer write signal
TBE=0
TSC=0
TBE=1
Serial output TXD
TBE=0
TSC=1✽
TBE=1
ST
D0
D1
SP
ST
D0
1 start bit
7 or 8 data bits
1 or 0 parity bit
1 or 2 stop bit (s)
Receive buffer read signal
✽Generated
RBF=0
RBF=1
Serial input RXD
ST
D0
D1
D1
SP
ST
D0
D1
SP
at 2nd bit in 2-stop-bit mode
RBF=1
SP
Notes 1: Error flag detection occurs at the same time that the RBF flag becomes “1” (at 1st stop bit, during reception).
2: The transmit interrupt (TI) can be selected to occur when either the T BE or TSC flag becomes “1” by the setting of the transmit interrupt source
selection bit (TIC) of the serial I/O control register.
3: The receive interrupt (RI) is set when the RBF flag becomes “1”.
4: After data is written to the transmit buffer register when TSC=1, 0.5 to 1.5 cycles of the data shift cycle is necessary until changing to TSC=0.
Fig. 23 Operation of UART serial I/O function
25
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
[Transmit Buffer/Receive Buffer Register
(TB/RB)] 001816
The transmit buffer register and the receive buffer register are located at the same address. The transmit buffer register is write-only
and the receive buffer register is read-only. If a character bit length is
7 bits, the MSB of data stored in the receive buffer register is “0”.
[Serial I/O Status Register (SIOSTS)] 001916
The read-only serial I/O status register consists of seven flags (bits 0
to 6) which indicate the operating status of the serial I/O function and
various errors.
Three of the flags (bits 4 to 6) are valid only in UART mode.
The receive buffer full flag (bit 1) is cleared to “0” when the receive
buffer is read.
If there is an error, it is detected at the same time that data is transferred from the receive shift register to the receive buffer register,
and the receive buffer full flag is set. A write to the serial I/O status
register clears all the error flags OE, PE, FE, and SE. Writing “0” to
the serial I/O enable bit (SIOE) also clears all the status flags, including the error flags.
All bits of the serial I/O status register are initialized to “0” at reset,
but if the transmit enable bit (bit 4) of the serial I/O control register
has been set to “1”, the transmit shift register shift completion flag
(bit 2) and the transmit buffer empty flag (bit 0) become “1”.
[Serial I/O Control Register (SIOCON)] 001A16
The serial I/O control register contains eight control bits for the serial
I/O function.
[UART Control Register (UARTCON)] 001B16
This is a 5 bit register containing four control bits, which are valid
when UART is selected and set the data format of an data receiver/
transfer, and one control bit, which is always valid and sets the output structure of the P45/TXD pin.
[Baud Rate Generator (BRG)] 001C16
The baud rate generator determines the baud rate for serial transfer.
The baud rate generator divides the frequency of the count source
by 1/(n + 1), where n is the value written to the baud rate generator.
26
■Notes on serial I/O
When setting the transmit enable bit to “1”, the serial I/O transmit
interrupt request bit is automatically set to “1”. When not requiring
the interrupt occurrence synchronized with the transmission enabled,
take the following sequence.
➀Set the serial I/O transmit interrupt enable bit to “0” (disabled).
➁Set the transmit enable bit to “1”.
➂Set the serial I/O transmit interrupt request bit to “0” after 1 or more
instructions have been executed.
➃Set the serial I/O transmit interrupt enable bit to “1” (enabled).
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
b7
b7
b0
Serial I/O status register
(SIOSTS : address 001916)
b7
b0
Serial I/O control register
(SIOCON : address 001A16)
Transmit buffer empty flag (TBE)
0: Buffer full
1: Buffer empty
BRG count source selection bit (CSS)
0: f(XIN) (f(XCIN) in low-speed mode)
1: f(XIN)/4 (f(XCIN)/4 in low-speed mode)
Receive buffer full flag (RBF)
0: Buffer empty
1: Buffer full
Transmit shift register shift completion flag (TSC)
0: Transmit shift in progress
1: Transmit shift completed
Serial I/O synchronous clock selection bit (SCS)
0: BRG output divided by 4 when clock synchronous serial
I/O is selected.
BRG output divided by 16 when UART is selected.
1: External clock input when clock synchronous serial I/O is
selected.
External clock input divided by 16 when UART is selected.
Overrun error flag (OE)
0: No error
1: Overrun error
SRDY output enable bit (SRDY)
0: P47 pin operates as ordinary I/O pin.
1: P47 pin operates as SRDY output pin.
Parity error flag (PE)
0: No error
1: Parity error
Transmit interrupt source selection bit (TIC)
0: Interrupt when transmit buffer has emptied
1: Interrupt when transmit shift operation is completed
Framing error flag (FE)
0: No error
1: Framing error
Transmit enable bit (TE)
0: Transmit disabled
1: Transmit enabled
Summing error flag (SE)
0: OE U PE U FE =0
1: OE U PE U FE =1
Receive enable bit (RE)
0: Receive disabled
1: Receive enabled
Not used (returns “1” when read)
Serial I/O mode selection bit (SIOM)
0: Asynchronous serial I/O (UART)
1: Clock synchronous serial I/O
b0 UART control register
(UARTCON : address 001B16)
Character length selection bit (CHAS)
0: 8 bits
1: 7 bits
Serial I/O enable bit (SIOE)
0: Serial I/O disabled
(pins P44–P47 operate as ordinary I/O pins)
1: Serial I/O enabled
(pins P44–P47 operate as serial I/O pins)
Parity enable bit (PARE)
0: Parity checking disabled
1: Parity checking enabled
Parity selection bit (PARS)
0: Even parity
1: Odd parity
Stop bit length selection bit (STPS)
0: 1 stop bit
1: 2 stop bits
P45/TXD P-channel output disable bit (POFF)
0: CMOS output (in output mode)
1: N-channel open-drain output (in output mode)
Not used (return “1” when read)
Fig. 24 Structure of serial I/O control registers
27
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
A-D CONVERTER
[A-D Conversion Registers (ADL, ADH)] 003216,
003316
The A-D conversion registers are read-only registers that contain the
result of an A-D conversion. During A-D conversion, do not read these
registers.
Resistor ladder
The resistor ladder outputs the comparison voltage by dividing the
voltage between VDD and VSS by resistance.
Channel Selector
The channel selector selects one of the ports P33/AIN3–P30/AIN0 and
ports P10/AIN4–P13/AIN7, and inputs it to the comparator.
[A-D Control Register (ADCON)] 003116
The A-D control register controls the A-D conversion process. Bits 0
to 2 are analog input pin selection bits. Bit 3 is an A-D conversion
completion bit and “0” during A-D conversion, then changes to “1”
when the A-D conversion is completed. Writing “0” to this bit starts
the A-D conversion. When bit 5, which is the A-D external trigger
valid bit, is set to “1”, A-D conversion is started even by a rising edge
or falling edge of an ADT input.
b7
b0
A-D control register
(ADCON : address 003116)
Analog input pin selection bits
0 0 0 : P30/AIN0
0 0 1 : P31/AIN1
0 1 0 : P32/AIN2
0 1 1 : P33/AIN3
1 0 0 : P10/AIN4
1 0 1 : P11/AIN5
1 1 0 : P12/AIN6
1 1 1 : P13/AIN7
Comparator and Control Circuit
A-D conversion completion bit
0 : Conversion in progress
1 : Conversion completed
The comparator and control circuit compares an analog input voltage with the comparison voltage and stores the result in the A-D
conversion register. When an A-D conversion is completed, the control circuit sets the A-D conversion completion bit and the A-D interrupt request bit to “1”.
Because the comparator consists of a capacitor coupling, a deficient
conversion speed may cause lack of electric charge and make the
conversion accuracy worse. When A-D conversion is performed, set
f(XIN) to at least 500 kHz.
When both bit 5 and bit 4 of the CPU mode register are set to “1”,
A-D conversion is performed by using the built-in self-oscillation
circuit.
Not used (return “0” when read)
A-D external trigger valid bit
0 : A-D external trigger invalid
1 : A-D external trigger valid
Not used (return “0” when read)
•8-bit read (Read only address 003216.)
b0
b7
A-D conversion register (low-order)
(ADL: Address 003216)
b9 b8 b7 b6 b5 b4 b3 b2
•10-bit read (Read address 003316 first.)
b0
b7
A-D conversion register (high-order)
(ADH: Address 003316)
b9 b8
A-D conversion register (low-order)
(ADL: Address 003216)
b7 b6 b5 b4 b3 b2 b1 b0
b0
b7
Trigger Start
When using the A-D external trigger, set the port shared with the
ADT pin to input. The polarity of INT1 interrupt edge also applies to
the A-D external trigger. When the INT1 interrupt edge polarity is
switched after an external trigger is validated, an A-D conversion
may be started.
Note: High-order 6 bits of address 003316 becomes “0” at reading.
Fig. 25 Structure of A-D control register
Data bus
b0
b7
A-D control register
P41/INT1/ADT
3
A-D control circuit
Channel selector
P30/AIN0
P31/AIN1
P32/AIN2
P33/AIN3
P10/AIN4
P11/AIN5
P12/AIN6
P13/AIN7
( H)
Comparater
28
(L)
A-D conversion register A-D conversion register
10
Resistor ladder
VSS
Fig. 26 A-D converter block diagram
A-D interrupt request
VCC
Bit
84
SEG58
133
SEG9
SEG8
Segment driver
134
14 15
Bit selector
7 8
Segment driver
0 1
Segment driver
14 15
Bit
14 15
Bit selector
7 8
SEG59
83
Segment driver
0 1
008316, 00C716
or
038316, 03C716
L M5
L M3
L M2
VL5
11
Voltage
multiplier
VL2
C1
C3
9
LCD control register 1
(address 003716)
LCD control register 2
(address 003816)
5
COM0 COM1
6
74
142
141
73
Common/Segment
driver
f(XCIN)/16
f(XIN)/1024
COM15 COM16/ COM17/ COM31/
SEG60
SEG1
SEG0
Common driver
“0”
“1”
Timing controller
LCDCK
LCD clock
generator
LC27 LC26 LC25 LC24 LC23 LC22 LC21 LC20
LC17 LC16 LC15 LC14 LC13 LC12 LC11 LC10
VL4
L M0
13
15
12 C2 14 VLIN
7
L M1
10 VL3 8 VL1
Bias controller
L M4
The 38C8 group has the built-in Liquid Crystal Display (LCD)
controller/driver consisting of the following.
●240-byte LCD display RAM
●52 or 68 segment driver
●16 or 32 common driver
●LCD clock generator
●Timing controller
Bit selector
7 8
008216, 00C616
or
038216, 03C616
L M6
LCD mode register
(address 003916)
LCD CONTROLLER/DRIVER
Bit selector
14 15 0 1
Bit
7 8
Bit
0 1
004116, 008516
or
034116, 038516
004016, 008416
or
034016, 038416
LCD display RAM
L M7
Data bus
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
●Bias controller
●Voltage multiplier
●LCD mode register
●LCD control registers 1, 2
A maximum of 68 segment output pins and 32 common output pins
can be used for control of external LCD display.
Fig. 27 Block diagram of LCD controller/driver
29
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 7 Maximum number of display pixels at each duty ratio
LCD Controller/Driver Function
Duty ratio
The controller/driver performs the bias control and the time sharing
control by the LCD control registers 1, 2 (LC1, LC2), and the LCD
mode register (LM). The data of corresponding LCDRAM is output
from the segment pins according to the output timing of the common
pins.
The 38C8 group has the voltage multiplier only for LCD in addition to
LCD controller/driver .
16
32
Maximum number of display pixel
16 ✕ 68 dots
(5 ✕ 7 dots + cursor 2 lines)
32 ✕ 52 dots
(5 ✕ 7 dots + cursor 4 lines)
Note: When executing the STP instruction while operating LCD, execute the STP instruction after prohibiting LCD (set “0” to bit 3
of the LCD mode regsiter).
[LCD mode register (LM)] 003916
The LCD mode register is used for setting the LCD controller/driver
according to the LCD panel used.
[LCD control register 1 (LC1)] 003716
The LCD control register 1 controls the voltage multiplier and built-in
resistance.
[LCD control register 2 (LC2)] 003816
The LCD control register 2 is write-only. Setting “1” to bit 5 makes
built-in resistance low resistance, and can raise drivability of the segment pins and the common pins.
b7
b0
b7
LCD control register 1
(LC1: address 003716)
Not used
(Do not write “1” to these bits.)
Drivability selection bit 1
0 : Normal (Drivability selection
bit 2 valid)
1 : Restraint (Note 1)
Not used
(Do not write “1” to this bit.)
Voltage multiplier enable bit
0 : Voltage multiplier stop
1 : Voltage multiplier operating
Note 1: Consumption current can be reduced by restraint of drivability. But
an irregular display might be caused according to the panel or the
display pattern.
b7
b0
LCD control register 2
(LC2: address 003816)
Not used (Do not write “1” to these bits.)
Drivability selection bit 2
0 : Normal
1 : Reinforcing (Note 2)
Not used (Do not write “1” to these bits.)
Note 2: The drive of a more large-scale LCD panel becomes easy by setting “1”
to this bit. But consumption current is increased at LCD drive. When
the drivability selection bit 1 is “1”, this function is invaid.
Fig. 28 Structure of LCD control register
30
b0
LCD mode register
(LM: address 003916)
Duty ratio selsection bit✽
1 : 32 duty (use COM0–COM31)
0 : 16 duty (use COM0–COM15)
Not used
(Do not write “0” to this bit.)
LCD display RAM address selection bit
0 : 3 page
1 : 0 page
LCD enable bit
0 : LCD OFF
1 : LCD ON
LCD drive timing selection bit
0 : A type
1 : B type
LCDCK division ratio selection bits
b6 b5
0 0 : Clock input
0 1 : 2 division of clock input
1 0 : 4 division of clock input
1 1 : 8 division of clock input
LCDCK count source selection bit (Note 3)
0 : f(XIN)/1024
1 : f(XCIN)/16
Note 3: LCDCK is a clock for a LCD timing controller.
Internal clock φ is XCIN divided by 2 in the low-speed mode.
✽ When selecting 32 duty, functions of pins 135 to 142 become COM16 to COM23,
and functions of pins 75 to 82 become COM24 to COM31.
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Bias Control
Voltage Multiplier
In the LCD power source pins (VL1–VL5), 1/7 bias is automatically
generated in 32 duty ratio and 1/5 bias is done in 16 duty ratio as
well. Be sure to connect the capacitor for smoothness to these pins.
When requiring 1/5 bias in 32 duty ratio, use an external resistor to
generate a necessary level. In this case the drivability selection bit 1
of LCD control register 1 must be “1”.
When the voltage multiplier is operated after a reference voltage for
boosting is applied to LCD power supply VLIN, a voltage that is approximately three times as large as that of VLIN pin occurs at the VL5
pin. Operate the voltage multiplier after applying a reference voltage
for boosting to VLIN.
The voltage multiplier multiplies a VLIN voltage by charge/discharge
of capacitors between C1 and C2 pins and to C3 pin. Accordingly, if a
large LCD panel is driven or a vias value is changed owing to an
external resistor, a level from VL5 pin might be not a requested level.
To prevent this, we recommend use of an external power source
which can supply stabilized power.
Additionally, when using the voltage multiplier, set a higher resistor
value (the sum of R1 to R5) as possible (100 kΩ or more recommended).
Table 8 Bias control and applied voltage to VL1–VL5
Bias value
1/7 bias
in 32 duty ratio
1/5 bias
in 16 duty ratio
Voltage value
VL5 = VLCD
VL4 = 6/7 VLCD
VL3 = 5/7 VLCD
VL2 = 2/7 VLCD
VL1 = 1/7 VLCD
VL5 = VLCD
VL4 = 4/5 VLCD
VL3 = 3/5 VLCD
VL2 = 2/5 VLCD
VL1 = 1/5 VLCD
Note: VLCD is a value which can be supplied to the LCD panel. Set value
which is less than maximum ratings to VLCD.
RT
RT
VL5
VL5
VL5
VL4
VL3
VL4
VL3
VL4
VL3
VL2
VL2
VL2
VL1
VL1
VL1
C3
C3
C3
C2
C2
C2
C1
C1
VLIN
C1
VLIN
VLIN
1.3 to
2.33 V
1/5, 1/7 bias
When using voltage multiplier
circuit
1/5, 1/7 bias
When not using voltage
multiplier circuit (1)
R1
R2
R3
R4
R5
•At 1/5 bias
R1=R2=R3=R4=R5
•At 1/7 bias
R1=R2=R4=R5
R3=3•R1
1/5, 1/7 bias
When not using voltage
multiplier circuit (2)
Fig. 29 Example of circuit at each bias
31
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Common Pin and Duty Ratio Control
LCD Display RAM
The common pins (COM0–COM31) to be used are determined by
duty ratio.
Select duty ratio by the duty ratio selection bit (bit 0 of the LCD mode
register).
When LCD display RAM address selection bit is “0”, the area of addresses 034016 to 042F16 is the designated RAM for the LCD display. When the bit is “1”, the area of addresses 004016 to 012F16 is
the designated RAM for it. When “1”s are written to these addresses,
the corresponding segments of the LCD display panel are turned on.
Table 9 Duty ratio control and common pins used
Duty
ratio
Duty ratio
selection bit
16
0
COM0–COM15 (Note)
32
1
COM0–COM31
LCD Drive Timing
Common pins used
The LCDCK timing frequency (LCD drive timing) is generated internally and the frame frequency can be determined with the following
equation;
Note: The SEG0/COM16–SEG7/COM23 pins are used as the SEG0–SEG7.
The SEG67/COM24–SEG60/COM31 pins are used as the SEG67–SEG60.
f(LCDCK) =
(frequency of count source for LCDCK)
(divider division ratio for LCD)
f(LCDCK)
(duty ratio)
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60
SEG61
SEG62
SEG63
SEG64
SEG65
SEG66
SEG67
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
Frame frequency =
COM0
0 0 0 0 0 0 0 0 1 0 0 0 1 0 1 1 1 0 1 1 1 1 1 0
0 0 1 1 1 0 0 1 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 0 LSB
COM1
0 0 0 0 0 0 0 0 1 1 0 1 1 0 0 1 0 0 0 0 1 0 0 0
0 1 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0
COM2
COM3
0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 1 0 0 0 0 1 0 0 0
0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0
0 1 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0
0 0 1 1 1 0 0 1 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0
COM4
COM5
0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0
0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 1 0 0 0 0 1 0 0 0
0 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0
0 1 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0
COM6
0 0 0 0 0 0 0 0 1 0 0 0 1 0 1 1 1 0 0 0 1 0 0 0
0 0 1 1 1 0 0 1 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 0
COM7
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 MSB
COM8
COM9
0 1 0 0 0 1 0 1 1 1 1 1 0 0 1 1 1 0 0 0 1 1 1 0
0 1 1 0 1 1 0 0 0 0 1 0 0 1 0 0 0 1 0 1 0 0 0 1
1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 0 0 LSB
1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0
COM10
0 1 0 1 0 1 0 0 0 1 0 0 0 1 0 0 0 1 0 1 0 0 0 0
1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0
COM11
0 1 0 0 0 1 0 0 0 0 1 0 0 0 1 1 1 0 0 1 0 0 0 0
0 1 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 1 0 1 0 0 0 0
1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0
1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0
COM14
0 1 0 0 0 1 0 1 0 0 0 1 0 1 0 0 0 1 0 1 0 0 0 1
0 1 0 0 0 1 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0
1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0
1 1 1 1 1 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0
COM15
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
COM16
COM17
0 0 1 0 0 0 1 0 1 1 1 1 1 0 0 1
1 0 0 1 0 0 0 1 0 1 1 1 1 1 0 0 LSB
0 0 1 1 0 1 1 0 0 0 0 1 0 0 1 0
0 0 1 0 1 0 1 0 0 0 1 0 0 0 1 0
0 1 0 1 1 0 1 1 0 1 0 0 0 0 0 0
0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0
0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 1
1 1 0 1 0 0 0 1 0 1 1 1 1 0 0 0
COM12
COM13
COM18
COM19
COM20
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 MSB
0 0 1 0 0 0 1 0 0 0 0 0 1 0 1 0
0 0 1 0 0 0 1 0 1 0 0 0 1 0 1 0
0 1 0 1 0 0 0 1 0 1 0 0 0 0 0 0
0 1 0 1 0 0 0 1 0 1 0 0 0 0 0 0
0 0 1 0 0 0 1 0 0 1 1 1 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
1 0 0 1 0 0 0 1 0 1 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 MSB
COM25
0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0
0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0
1 1 1 1 1 0 1 1 1 1 0 0 0 0 0 0 LSB
1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0
COM26
COM27
0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0
0 0 0 0 0 0 1 1 1 0 0 0 1 0 0 0
1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0
1 1 1 1 0 0 1 1 1 1 0 0 0 0 0 0
COM28
0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0
1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
COM29
COM30
0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0
0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0
1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
COM31
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 MSB
COM21
COM22
COM23
COM24
036C
036D
036E
036F
0370
0371
0372
0378
0374
0375
0376
0377
0378
0379
037A
037B
037C
037D
037E
037F
0380
0381
0382
0383
03EC
03ED
03EE
03EF
03F0
03F1
03F2
03F3
03F4
03F5
03F6
03F7
03F8
03F9
03FA
03FB
0420
0421
0422
0423
0424
0425
0426
0427
0428
0429
042A
042B
042C
042D
042E
042F
03B0
03B1
03B2
03B3
03B4
03B5
03B6
03B7
03B8
03B9
03BA
03BB
03BC
03BD
03BE
03BF
03C0
03C1
03C2
03C3
03C4
03C5
03C6
03C7
03C8
03C9
03CA
03CB
03CC
03CD
03CE
03CF
03D0
03D1
03D2
03D3
03D4
03D5
03D6
03D7
03FC
03FD
03FE
03FF
0400
0401
0402
0403
0404
0405
0406
0407
0408
0409
040A
040B
0384
0385
0386
0387
0388
0389
038A
038B
038C
038D
038E
038F
0390
0391
0392
0393
0394
0395
0396
0397
0398
0399
039A
039B
0340
0341
0342
0343
0344
0345
0346
0347
0348
0349
034A
034B
034C
034D
034E
034F
0350
0351
0352
0353
0354
0355
0356
0357
LCD display map
When selecting 3 page
32
00EC
00ED
00EE
00EF
00F0
00F1
00F2
00F3
00F4
00F5
00F6
00F7
00F8
00F9
00FA
00FB
0120
0121
0122
0123
0124
0125
0126
0127
0128
0129
012A
012B
012C
012D
012E
012F
006C
006D
006E
006F
0070
0071
0072
0073
0074
0075
0076
0077
0078
0079
007A
007B
007C
007D
007E
007F
0080
0081
0082
0083
00C8
00C9
00CA
00CB
00CC
00CD
00CE
00CF
00D0
00D1
00D2
00D3
00D4
00D5
00D6
00D7
00B0
00B1
00B2
00B3
00B4
00B5
00B6
00B7
00B8
00B9
00BA
00BB
00BC
00BD
00BE
00BF
00C0
00C1
00C2
00C3
00C4
00C5
00C6
00C7
Fig. 30 LCD display RAM map
00FC
00FD
00FE
00FF
0100
0101
0102
0103
0104
0105
0106
0107
0108
0109
010A
010B
0040
0041
0042
0043
0044
0045
0046
0047
0048
0049
004A
004B
004C
004D
004E
004F
0050
0051
0052
0053
0054
0055
0056
0057
0084
0085
0086
0087
0088
0089
008A
008B
008C
008D
008E
008F
0090
0091
0092
0093
0094
0095
0096
0097
0098
0099
009A
009B
When selecting 0 page
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
LCDCK
1 frame (16 clocks)
1 frame (16 clocks)
VL5
VL4
COM23
VL3
VL2
VL1
VSS
VL5
VL4
COM22
VL3
VL2
VL1
VSS
VL5
VL4
SEG0
VL3
VL2
VL1
VSS
VL5
VL4
VL3
VL2
VL1
SEG0 –
COM23
VSS
VL1
VL2
VL3
VL4
VL5
ON
OFF
ON
OFF
VL5
VL4
VL3
VL2
VL1
SEG0 –
COM22
VSS
VL1
VL2
VL3
VL4
VL5
OFF
OFF
Fig. 31 LCD drive waveform (16 duty ratio, 1/5 bias, A type)
33
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
LCDCK
1 frame (32 clocks)
COM31
1 frame (32 clocks)
VL5
VL4
VL3
VL2
VL1
VSS
VL5
VL4
VL3
COM30
VL2
VL1
VSS
VL5
VL4
VL3
SEG0
VL2
VL1
VSS
VL5
VL4
VL3
SEG0 –
COM31
VL2
VL1
VSS
VL1
VL2
VL3
VL4
VL5
ON
OFF
ON
OFF
ON
OFF
VL5
VL4
VL3
SEG0 –
COM30
VL2
VL1
VSS
VL1
VL2
VL3
VL4
VL5
OFF
Fig. 32 LCD drive waveform (32 duty ratio, 1/7 bias, B type)
34
OFF
OFF
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an “L”
level for 2 µs or more. Then the RESET pin is returned to an “H” level
(the power source voltage should be between VCC (min.) and 5.5 V,
and the quartz-crystal oscillator should be stable), reset is released.
After the reset is completed, the program starts from the address
contained in address FFFD16 (high-order byte) and address FFFC16
(low-order byte). Make sure that the reset input voltage is less than
0.2Vcc when a power source voltage passes VCC (min.).
Poweron
RESET
VCC
Power source
voltage
0V
Reset input
voltage
0V
RESET
0.2VCC
VCC
Power source
voltage detection
circuit
Fig. 33 Reset circuit example
XIN
φ
RESET
Internal
reset
Reset address from
vector table
Address
?
?
?
Data
?
FFFC
ADL
FFFD
ADH, ADL
ADH
SYNC
XIN : about 8200 cycles
Notes 1: The frequency relation of f(XIN) and f(φ) is f(XIN) = 8 • f(φ).
2: The question marks (?) indicate an undefined state that
depends on the previous state.
Fig. 34 Reset sequence
35
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Address
Register contents
Address
(1) Port P0 direction register
000116
0016
(21) A-D control register
003116
0816
(2) Port P1 direction register
000316
0016
003216
XX16
(3) Port P2 direction register
000516
0016
003316
XX16
(4) Port P3 direction register
000716
0016
(22) A-D conversion register
(low-order)
(23) A-D conversion register
(high-order)
(24) LCD control register 1
003716
0016
(5) Port P4 direction register
000916
0016
(25) LCD control register 2
003816
0016
(6) PULL register A
001616
0016
(26) LCD mode register
003916
0316
(7) PULL register B
001716
0016
(27) Interrupt edge selection register 003A16
0016
(8) Serial I/O status register
001916
8016
(28) CPU mode register
003B16
4C16
(9) Serial I/O control register
001A16
0016
(29) Interrupt request register 1
003C16
0016
(10) UART control register
001B16
E016
(30) Interrupt request register 2
003D16
0016
(11) Timer X (low-order)
002016
FF16
(31) Interrupt control register 1
003E16
0016
(12) Timer X (high-order)
002116
FF16
(32) Interrupt control register 2
003F16
0016
(13) Timer Y (low-order)
002216
FF16
(33) Processor status register
(14) Timer Y (high-order)
002316
FF16
(34) Program counter
(15) Timer 1
002416
FF16
(16) Timer 2
002516
0116
(17) Timer 3
002616
FF16
(18) Timer X mode register
002716
0016
(19) Timer Y mode register
002816
0016
(20) Timer 123 mode register
002916
0016
(PS) ✕ ✕ ✕ ✕ ✕ 1 ✕ ✕
(PCH)
Contents of address FFFD16
(PCL)
Contents of address FFFC16
Note: The contents of all other register and RAM are undefined after reset, so they must be initialized by software.
✕ : Undefined
Fig. 35 Internal status at reset
36
Register contents
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
CLOCK GENERATING CIRCUIT
The 38C8 group has two built-in oscillation circuits: main clock XINXOUT oscillation circuit and sub-clock XCIN-XCOUT oscillation circuit.
An oscillation circuit can be formed by connecting a resonator between XIN and XOUT (XCIN and XCOUT). RC oscillation is available for
XIN-XOUT.
Immediately after reset is released, the XIN-XOUT oscillation circuit
starts oscillating, and XCIN and XCOUT pins go to high impedance
state.
Main Clock
An oscillation circuit by a resonator can be formed by setting the
OSCSEL pin is set to “L” level and connecting a resonator between
XIN and XOUT. Use the circuit constants in accordance with the resonator manufacturer’s recommended values. No external resistor is
needed between XIN and XOUT since a feed-back resistor exists onchip. To supply a clock signal externally, make the XOUT pin open in
the “L” level state of the OSCSEL pin, and supply the clock from the
XIN pin. The RC oscillation circuit can be formed by setting the
OSCSEL pin to “H” level and connecting a resistor between the XIN
pin and the XOUT pin. At this time, the feed-back resistor is cut off.
The frequency of the RC oscillation changes owing to a parasitic
capacitance or the wiring length etc. of the printed circuit board. Do
not use the RC oscillation in the usage which the frequency accuracy
of the main clock is needed.
Oscillation Control
(1) Stop Mode
If the STP instruction is executed, the internal clock φ stops at an “H”
level, and XIN and XCIN oscillators stop. Timer 1 is set to “FF16” and
timer 2 is set to “0116.”
Either XIN divided by 16 or XCIN divided by 16 is input to timer 1 as
count source, and the output of timer 1 is connected to timer 2. The
bits except bit 4 of the timer 123 mode register are cleared to “0.” Set
the interrupt enable bits of timer 1 and timer 2 to disabled (“0”) before
executing the STP instruction.
Oscillator restarts at reset or when an external interrupt is received,
but the internal clock φ is not supplied to the CPU until timer 2
underflows. This allows time for the clock circuit oscillation to stabilize.
(2) Wait Mode
If the WIT instruction is executed, the internal clock φ stops at an “H”
level. The states of XIN and XCIN are the same as the state before
executing the WIT instruction. The internal clock φ restarts at reset
or when an interrupt is received. Since the oscillator does not stop,
normal operation can be started immediately after the clock is restarted.
Sub-clock
Connect a resonator between XCIN and XCOUT. An external feedback resistor is needed between XCIN and XCOUT since a feed-back
resistor does not exist on-chip. The sub-clock XCIN-XCOUT oscillation
circuit cannot directly input clocks that are externally generated. Accordingly, be sure to cause an external resonator to oscillate.
Frequency Control
(1) Middle-speed Mode
XCIN
XCOUT OSCSEL
Rf
Rd
XIN
XOUT
Rosc
CCIN
The internal clock φ is the frequency of XIN divided by 8. After reset is
released, this mode is selected.
(2) High-speed Mode
Fig. 36 RC oscillation circuit
The internal clock φ is the frequency of XIN divided by 2.
(3) Low-speed Mode
The internal clock φ is the frequency of XCIN divided by 2.
A low-power consumption operation can be realized by stopping the
main clock XIN in this mode. To stop the main clock, set bit 5 of the
CPU mode register to “1”. When the main clock XIN is restarted, set
enough time for oscillation to stabilize by programming.
■Notes on clock generating circuit
If you switch the mode between middle/high-speed and low-speed,
stabilize both XIN and XCIN oscillations. The sufficient time is required
for the sub-clock to stabilize, especially immediately after power on
and at returning from stop mode. When switching the mode between
middle/high-speed and low-speed, set the frequency on condition
that f(XIN) > 3•f(XCIN).
XCIN XCOUT OSCSEL XIN XOUT
Rf
CCIN
Rd
CCOUT
CI N
COUT
Fig. 37 Resonator circuit
37
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
XCOUT
XCIN
XIN
XOUT
Timer 1 count
source selection
bit
Internal system clock selection bit
(Note)
Low-speed mode
“1”
1/2
“0”
Middle-/High-speed mode
Timer 2 count
source selection
bit
“1”
1/2
1/4
Timer 1
“0”
“0”
Timer 2
“1”
Main clock division ratio selection bit
Middle-speed mode
“1”
Main clock stop bit
Q
S
S
R
STP instruction
Timing φ
(Internal clock)
“0”
High-speed mode
or Low-speed mode
WIT
instruction
R
Q
Q
S
R
Reset
Interrupt disable flag
I
Interrupt request
Note: When selecting the XC oscillation, set the sub-clock (XCIN –XCOUT) oscillating bit to “1”.
Fig. 38 Clock generating circuit block diagram
38
STP instruction
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Reset
“0
”
“0”
6
”
“0
“1
”
6
”
“1
CM6
Middle-speed mode (f(φ) = 0 .5 MHz)
High-sp eed mode (f(φ) = 2 MHz)
“0”
CM7 = 0 (4 MHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (4 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
CM6
“1”
“0”
CM7 = 1 (32 kHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (4 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
CM7
“1”
CM7
“1”
“0”
“1”
“0”
CM7 = 0 (4 MHz selected)
CM6 = 1 (Middle-speed)
CM5 = 0 (4 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
”
“0
L ow-speed mode (f(φ) =16 kHz)
CM6
CM7 = 1 (32 kHz selected)
CM6 = 1 (Middle-speed)
CM5 = 1 (4 MHz stopped)
CM4 = 1 (32 kHz oscillating)
“1”
“0”
“0
”
“0
”
”
“1
C
“1 M5
C ”
“1 M6
”
5
C ”
M
“0 6
C ”
M1
“
“0”
Low-speed mode (f(φ) =16 kHz)
CM5
“1”
Low-speed mode (f(φ) = 16 kHz)
CM7 = 1 (32 kHz selected)
CM6 = 1 (Middle-speed)
CM5 = 0 (4 MHz oscillating)
CM4 = 1 (32 kHz oscillating)
CM5
“1”
CM4
“0
”
4
C
“1 M4
C ”
M
CM7 = 0 (4 MHz selected)
CM6 = 0 (High-speed)
CM5 = 0 (4 MHz oscillating)
CM4 = 0 (32 kHz stoped)
C
M1”
“
CM4
“1”
High-speed mode (f(φ) = 2 MHz)
“0”
C ”
M0
“
“0”
CM7 = 0 (4 MHz selected)
CM6 = 1 (Middle-speed)
CM5 = 0 (4 MHz oscillating)
CM4 = 0 (32 kHz stoped)
“1”
CM6
“1”
Middle-speed mode (f(φ) = 0.5 MHz)
Low-speed mode (f(φ) =16 kHz)
“0”
CM7 = 1 (32 kHz selected)
CM6 = 0 (High-speed)
CM5 = 1 (4 MHz stopped)
CM4 = 1 (32 kHz oscillating)
b7
b4
CPU mode register
(CPUM : address 003B16)
CM4 : Sub-clock (XCIN –XCOUT) oscillating bit
0: Stopped
1: Oscillating
CM5 : Main clock (XIN–XOUT) stop bit
0: Oscillating
1: Stopped
CM6 : Main clock division ratio selection bit
0: f(XIN)/2 (high-speed mode)
1: f(XIN)/8 (middle-speed mode)
CM7 : Internal system clock selection bit
0: XIN–XOUT selected
(middle-/high-speed mode)
1: XCIN–XCOUT selected
(low-speed mode)
Notes 1 : Switch the mode by the allows shown between the mode blocks. (Do not switch between the mode directly without an allow.)
2 : T he all modes can be switched to the stop mode or the wait mode and returned to the source mode when the stop mode or the wait mode is ended.
3 : T imer and LCD operate in the wait mode.
4 : When the stop mode is ended, a delay of approximately 1 ms occurs automatically by timer 1 and timer 2 in middle-/high-speed mode.
5 : When the stop mode is ended, a delay of approximately 0.25 s occurs automatically by timer 1 and timer 2 in low-speed mode.
6 : Wait until oscillation stabilizes after oscillating the main clock XIN before the switching from the low-speed mode to middle-/high-speed mode.
7 : T he example assumes that 4 MHz is being applied to the XIN pin and 32 kHz to the XCIN pin. φ indicates the internal clock.
Fig. 39 State transitions of system clock
39
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
NOTES ON PROGRAMMING
Processor Status Register
A-D Converter
The contents of the interrupt request bits do not change immediately
after they have been written. After writing to an interrupt request register, execute at least one instruction before performing a BBC or
BBS instruction.
The comparator is constructed linked to a capacitor. When the conversion speed is not enough, the conversion accuracy might be ruined by the disappearance of the charge. When A-D conversion is
performed, set f(XIN) to at least 500 kHz.
When the following operations are performed, the A-D conversion
operation cannot be guaranteed.
•When the CPU mode register is operated during A-D conversion
operation,
•When the A-D control register is operated during A-D conversion
operation,
•When STP or WIT instruction is executed during A-D conversion
operation.
Decimal Calculations
Instruction Execution Time
• To calculate in decimal notation, set the decimal mode flag (D) to
“1”, then execute an ADC or SBC instruction. After executing an
ADC or SBC instruction, execute at least one instruction before
executing a SEC, CLC, or CLD instruction.
• In decimal mode, the values of the negative (N), overflow (V), and
zero (Z) flags are invalid.
The instruction execution time is obtained by multiplying the frequency
of the internal clock φ by the number of cycles needed to execute an
instruction.
The number of cycles required to execute an instruction is shown in
the list of machine instructions.
The contents of the processor status register (PS) after a reset are
undefined, except for the interrupt disable flag (I) which is “1”. After a
reset, initialize flags which affect program execution. In particular, it
is essential to initialize the index X mode (T) and the decimal mode
(D) flags because of their effect on calculations.
Interrupts
LCD Control
Timers
If a value n (between 0 and 255) is written to a timer latch, the frequency division ratio is 1/(n+1).
Multiplication and Division Instructions
• The index X mode (T) and the decimal mode (D) flags do not affect
the MUL and DIV instruction.
• The execution of these instructions does not change the contents
of the processor status register.
Ports
The contents of the port direction registers cannot be read. The following cannot be used:
• The data transfer instruction (LDA, etc.)
• The operation instruction when the index X mode flag (T) is “1”
• The addressing mode which uses the value of a direction register
as an index
• The bit-test instruction (BBC or BBS, etc.) to a direction register
• The read-modify-write instructions (ROR, CLB, or SEB, etc.) to a
direction register.
Use instructions such as LDM and STA, etc., to set the port direction
registers.
Serial I/O
In clock synchronous serial I/O, if the receive side is using an external clock and it is to output the SRDY signal, set the transmit enable
bit, the receive enable bit, and the SRDY output enable bit to “1”.
Serial I/O continues to output the final bit from the TxD pin after transmission is completed.
40
When using the voltage multiplier, apply prescribed voltage to the
VLIN pin in the state in which the LCD enable bit is “0”, and set the
voltage multiplier enable bit to “1”.
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
NOTES ON USE
Countermeasures Against Noise
Noise
(1) Shortest wiring length
➀ Wiring for RESET pin
Make the length of wiring which is connected to the RESET pin as
short as possible. Especially, connect a capacitor across the RESET
pin and the VSS pin with the shortest possible wiring (within 20mm).
● Reason
The width of a pulse input into the RESET pin is determined by the
timing necessary conditions. If noise having a shorter pulse width
than the standard is input to the RESET pin, the reset is released
before the internal state of the microcomputer is completely initialized. This may cause a program runaway.
Noise
Reset
circuit
RESET
VSS
VSS
N.G.
Reset
circuit
VSS
RESET
VSS
O.K.
Fig. 40 Wiring for the RESET pin
➁ Wiring for clock input/output pins
• Make the length of wiring which is connected to clock I/O pins as
short as possible.
• Make the length of wiring (within 20 mm) across the grounding
lead of a capacitor which is connected to an oscillator and the
VSS pin of a microcomputer as short as possible.
• Separate the VSS pattern only for oscillation from other VSS patterns.
XIN
XOUT
VSS
N.G.
XIN
XOUT
VSS
O.K.
Fig. 41 Wiring for clock I/O pins
(2) Connection of bypass capacitor across VSS line and VCC line
In order to stabilize the system operation and avoid the latch-up,
connect an approximately 0.1 µF bypass capacitor across the VSS
line and the VCC line as follows:
• Connect a bypass capacitor across the VSS pin and the VCC pin at
equal length.
• Connect a bypass capacitor across the VSS pin and the VCC pin
with the shortest possible wiring.
• Use lines with a larger diameter than other signal lines for VSS line
and VCC line.
• Connect the power source wiring via a bypass capacitor to the VSS
pin and the VCC pin.
AA
AA
AA
AA
AA
VCC
VSS
N.G.
AA
AA
AA
AA
AA
VCC
VSS
O.K.
Fig. 42 Bypass capacitor across the VSS line and the VCC line
● Reason
If noise enters clock I/O pins, clock waveforms may be deformed.
This may cause a program failure or program runaway. Also, if a
potential difference is caused by the noise between the VSS level
of a microcomputer and the VSS level of an oscillator, the correct
clock will not be input in the microcomputer.
41
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
(3) Oscillator concerns
In order to obtain the stabilized operation clock on the user system
and its condition, contact the oscillator manufacturer and select the
oscillator and oscillation circuit constants. Be careful especially when
range of voltage or/and temperature is wide.
Also, take care to prevent an oscillator that generates clocks for a
microcomputer operation from being affected by other signals.
➀ Keeping oscillator away from large current signal lines
Install a microcomputer (and especially an oscillator) as far as possible from signal lines where a current larger than the tolerance of
current value flows.
● Reason
In the system using a microcomputer, there are signal lines for
controlling motors, LEDs, and thermal heads or others. When a
large current flows through those signal lines, strong noise occurs
because of mutual inductance.
➁ Installing oscillator away from signal lines where potential levels
change frequently
Install an oscillator and a connecting pattern of an oscillator away
from signal lines where potential levels change frequently. Also,
do not cross such signal lines over the clock lines or the signal
lines which are sensitive to noise.
● Reason
Signal lines where potential levels change frequently (such as the
CNTR pin signal line) may affect other lines at signal rising edge
or falling edge. If such lines cross over a clock line, clock waveforms may be deformed, which causes a microcomputer failure or
a program runaway.
(4) Analog input
The analog input pin is connected to the capacitor of a comparator.
Accordingly, sufficient accuracy may not be obtained by the charge/
discharge current at the time of A-D conversion when the analog
signal source of high-impedance is connected to an analog input pin.
In order to obtain the A-D conversion result stabilized more, please
lower the impedance of an analog signal source, or add the smoothing capacitor to an analog input pin.
(5) Difference of memory type and size
When Mask ROM and PROM version and memory size differ in one
group, actual values such as an electrical characteristics, A-D conversion accuracy, and the amount of proof of noise incorrect operation may differ from the ideal values.
When these products are used switching, perform system evaluation
for each product of every after confirming product specification.
(6) Wiring to VPP pin of One Time PROM version
Connect an approximately 5 kΩ resistor to the VPP pin the shortest
possible in series.
Note: Even when a circuit which included an approximately 5 kΩ
resistor is used in the Mask ROM version, the microcomputer
operates correctly.
● Reason
The VPP pin of the One Time PROM version is the power source
input pin for the built-in PROM. When programming in the built-in
PROM, the impedance of the VPP pin is low to allow the electric current for writing flow into the built-in PROM. Because of this, noise
can enter easily. If noise enters the VPP pin, abnormal instruction
codes or data are read from the built-in PROM, which may cause a
program runaway.
➀ Keeping oscillator away from large current signal lines
Microcomputer
Mutual inductance
M
About 5kΩ
P40/VPP
XIN
XOUT
VSS
Large
current
Source signal
VSS
GND
➁ Installing oscillator away from signal lines where potential levels change frequently
N.G.
Do not cross
CNTR
XIN
XOUT
VSS
Fig. 43 Wiring for a large current signal line/Wiring of signal lines
where potential levels change frequently
42
Fig. 44 Wiring for the VPP pin of One Time PROM
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
DATA REQUIRED FOR MASK ORDERS
ROM PROGRAMMING METHOD
The following are necessary when ordering a mask ROM production:
1. Mask ROM Order Confirmation Form✽
2. Mark Specification Form✽
3. Data to be written to ROM, in EPROM form (three identical copies)
or one floppy disk.
The built-in PROM of the blank One Time PROM version and built-in
EPROM version can be read or programmed with a general-purpose
PROM programmer using a special programming adapter
(PCA7447FP).
✽For the mask ROM confirmation and the mark specifications, refer
to the “Mitsubishi MCU Technical Information” Homepage
(http://www.infomicom.maec.co.jp/indexe.htm).
Table 10 Programming adapter
Package
144P6Q-A
Name of Programming Adapter
PCA7447FP
The PROM of the blank One Time PROM version is not tested or
screened in the assembly process and following processes. To ensure proper operation after programming, the procedure shown in
Figure 45 is recommended to verify programming.
Programming with PROM
programmer
Screening (Caution)
(150°C for 40 hours)
Verification with
PROM programmer
Functional check in
target device
Caution : The screening temperature is far higher
than the storage temperature. Never
expose to 150 °C exceeding 100 hours.
Fig. 45 Programming and testing of One Time PROM version
43
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
ELECTRICAL CHARACTERISTICS
Table 11 Absolute maximum ratings
VI
VI
VI
Parameter
Power source voltage
Input voltage
P00–P07, P10–P17, P20–P27,
P30–P33, P40–P47
Input voltage
C1, C2
Input voltage
RESET, XIN, XCIN
Input voltage
VLIN
VI
VO
Input voltage
Output voltage
Symbol
VCC
VI
VO
VO
VO
Pd
Topr
Tstg
VL1, VL2, VL3, VL4, VL5
P00–P07, P10–P17, P20–P27,
P30–P33, P41–P47
Output voltage C1, C2, C3
Output voltage COM0–COM31, SEG0–SEG67
Output voltage XOUT, XCOUT
Power dissipation
Operating temperature
Storage temperature
Conditions
All voltages are based on
Vss. Output transistors
are cut off.
When voltage multiplier is
not operated.
VL1≤VL2≤VL3≤VL4≤VL5
Ta = 25°C
Ratings
–0.3 to 7.0
–0.3 to VCC+0.3
Unit
V
V
–0.3 to 7.0
–0.3 to VCC+0.3
–0.3 to 7.0
V
V
V
–0.3 to 7.0
–0.3 to VCC+0.3
V
V
–0.3 to 7.0
–0.3 to VL5+0.3
–0.3 to VCC+0.3
300
–20 to 85
–40 to 125
V
V
V
mW
°C
°C
Table 12 Recommended operating conditions (Vcc = 2.2 to 5.5 V, Ta = –20 to 85°C, unless otherwise noted)
Limits
Symbol
Parameter
Min.
Typ.
VCC
Power source
High-speed mode f(XIN) ≤ 8 MHz
4.0
5.0
voltage
Middle-speed mode f(XIN) ≤ 8 MHz
2.7
5.0
Middle-speed mode (mask ROM version) f(XIN) ≤ 4 MHz
2.2
5.0
Middle-speed mode (One Time PROM version) f(XIN) ≤ 4 MHz
2.5
5.0
Low-speed mode (mask ROM version)
2.2
5.0
Low-speed mode (One Time PROM version)
2.5
5.0
VSS
Power source voltage
0
VLIN
Power source voltage
VLIN
VL5
Power source voltage
VL5
VIA
Analog input voltage
AIN0–AIN7
VSS
VIH
“H” input voltage
P00–P07, P10–P17, P45, P47
0.7VCC
VIH
“H” input voltage
P20–P27, P30–P33, P40–P43, P44, P46
0.8VCC
VIH
“H” input voltage
RESET
0.8VCC
VIH
“H” input voltage
XIN
0.8VCC
VIL
“L” input voltage
P00–P07, P10–P17, P45, P47
VSS
VIL
“L” input voltage
P20–P27, P30–P33, P40–P43, P44, P46
VSS
VIL
“L” input voltage
RESET
VSS
VIL
“L” input voltage
XIN
VSS
ΣIOH(peak) “H” total peak output current
All ports
(Note 1)
ΣIOL(peak) “L” total peak output current
All ports
(Note 1)
ΣIOH(avg) “H” total average output current All ports
(Note 2)
ΣIOL(avg)
“L” total average output current All ports
(Note 2)
IOH(peak)
“H” peak output current
All ports
(Note 3)
IOL(peak)
“L” peak output current
All ports
(Note 3)
IOH(avg)
“H” average output current
All ports
(Note 4)
IOL(avg)
“L” average output current
All ports
(Note 4)
ROSC
Oscillation resistor at selecting RC oscillation
5
8.2
Notes 1: The total peak output current is the peak value of the peak currents flowing through all the applicable ports.
2: The total average output current is the average value measured over 100 ms flowing through all the applicable ports.
3: The peak output current is the peak current flowing in each port.
4: The average output current is an average value measured over 100 ms.
44
Max.
5.5
5.5
5.5
5.5
5.5
5.5
2.33
7.0
VCC
VCC
VCC
VCC
VCC
0.3VCC
0.2VCC
0.2VCC
0.2VCC
–60.0
60.0
–30.0
30.0
–5.0
10.0
–2.5
5.0
10
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
mA
kΩ
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 13 Recommended operating conditions (mask ROM version) (Vcc = 2.2 to 5.5 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
f(CNTR0)
f(CNTR1)
f(XIN)
f(XCIN)
Parameter
Conditions
Min.
Limits
Typ.
Timer X, timer Y input frequency (duty cycle 50%)
Main clock input oscillation frequency (Note 1)
High-speed mode
(4.0 V ≤ VCC ≤ 5.5 V)
High-speed mode
(2.2 V ≤ VCC < 4.0 V)
Middle-speed mode
(2.7 V ≤ VCC ≤ 5.5 V)
Middle-speed mode
(2.2 V ≤ VCC < 2.7 V)
Sub-clock input oscillation frequency (Notes 1, 2)
32.768
Max.
f(XIN)/2
Unit
Hz
8.0
MHz
2.9✕VCC–3.6
MHz
8.0
MHz
8✕(VCC–1.7)
MHz
50
kHz
Notes 1: When the oscillation frequency has a duty cycle of 50 %.
2: When using the microcomputer in low-speed mode, set the sub-clock input oscillation frequency on condition that f(XCIN) < f(XIN)/3.
Table 14 Recommended operating conditions (PROM version) (Vcc = 2.5 to 5.5 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
Parameter
f(CNTR0)
Timer X, timer Y input frequency (duty cycle 50%)
f(CNTR1)
f(XIN)
Main clock input oscillation frequency (Note 1)
f(XCIN)
Sub-clock input oscillation frequency (Notes 1, 2)
Conditions
Min.
Limits
Typ.
High-speed mode
(4.0 V ≤ VCC ≤ 5.5 V)
High-speed mode
(2.5 V ≤ VCC < 4.0 V)
Middle-speed mode
(2.7 V ≤ VCC ≤ 5.5 V)
Middle-speed mode
(2.5 V ≤ VCC < 2.7 V)
32.768
Max.
f(XIN)/2
Unit
Hz
8.0
MHz
4✕VCC–8
MHz
8.0
MHz
20✕(VCC–2.3)
MHz
50
kHz
Notes 1: When the oscillation frequency has a duty cycle of 50 %.
2: When using the microcomputer in low-speed mode, set the sub-clock input oscillation frequency on condition that f(XCIN) < f(XIN)/3.
45
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 15 Electrical characteristics (Vcc = 2.2 to 5.5 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
VOH
VOH
VOL
VOL
VT+–VTVT+–VTVT+–VTIIH
IIH
IIH
IIL
IIL
IIL
46
Parameter
“H” output voltage
P00–P07, P10–P17, P30–P33
“H” output voltage
P20–P27, P41–P47
“L” output voltage
P00–P07, P10–P17, P30–P33
“L” output voltage
P20–P27, P41–P47
Hysteresis
INT0, INT1, ADT, CNTR0, CNTR1, P20–P27
Hysteresis SCLK, RxD
Hysteresis RESET
“H” input current All ports
“H” input current RESET
“H” input current XIN
“L” input current All ports
“L” input current RESET
“L” input current XIN
Test conditions
IOH = –5.0 mA
VCC = 5.0 V
IOH = –1.5 mA
VCC = 5.0 V
IOH = –1.25 mA
VCC = 2.2 V
IOH = –5.0 mA
VCC = 5.0 V
IOH = –1.5 mA
VCC = 5.0 V
IOH = –1.25 mA
VCC = 2.2 V
IOL = 5.0 mA
VCC = 5.0 V
IOL = 1.5 mA
VCC = 5.0 V
IOL = 1.25 mA
VCC = 2.2 V
IOL = 5.0 mA
VCC = 5.0 V
IOL = 1.5 mA
VCC = 5.0 V
IOL = 1.25 mA
VCC = 2.2 V
Min.
VCC–2.0
Limits
Typ.
Max.
V
VCC–0.5
V
VCC–1.0
V
VCC–2.0
V
VCC–0.5
V
VCC–1.0
V
2.0
V
0.5
V
1.0
V
2.0
V
0.5
V
1.0
V
0.5
V
0.5
0.5
–5.0
V
V
µA
µA
µA
µA
5.0
5.0
4.0
VI = VSS
Pull-ups “off”
VCC = 5.0 V, VI = VSS
Pull-ups “on”
VCC = 2.2 V, VI = VSS
Pull-ups “on”
VI = VSS
VI = VSS
Unit
–60.0
–120.0
–240.0
µA
–5.0
–20.0
–40.0
µA
–5.0
µA
µA
–4.0
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 16 Electrical characteristics (Vcc = 2.2 to 5.5 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
VRAM
ICC
IAD
IL5
FROSC
Parameter
RAM hold voltage
Power source current
A-D converter current
dissipation
VL5 input current (Note)
RC oscillation frequency
Test conditions
When clock is stopped
High-speed mode, Vcc = 5.0 V
f(XIN) = 8.0 MHz
f(XCIN) = 32.768 kHz
Middle-speed mode, Vcc = 5.0 V
f(XIN) = 8.0 MHz
f(XCIN) = 32.768 kHz
Middle-speed mode, Vcc = 3.0 V
f(XIN) = 8.0 MHz
f(XCIN) = 32.768 kHz
Low-speed mode, VCC = 3.0 V,
f(XIN) = stopped
f(XCIN) = 32.768 kHz
High-/Middle-speed mode, VCC =
5.0 V,
f(XIN) = 8.0 MHz (in WIT state)
f(XCIN) = 32.768 kHz
High-/Middle-speed mode, Vcc = 3.0 V
f(XIN) = 8.0 MHz (in WIT state)
f(XCIN) = 32.768 kHz
Low-speed mode, VCC = 3.0 V,
f(XIN) = stopped
f(XCIN) = 32.768 kHz (in WIT state)
All oscillation stopped
Ta = 25 °C, Output transistors “off”
(in STP state)
All oscillation stopped
Ta = 85 °C, Output transistors “off”
(in STP state)
Current increase at A-D converter
operated, f(XIN) = 8.0 MHz
VL5 = 6.0 V, Ta = 25 °C
ROSC = 8.2 kΩ
Min.
2.0
1.5
Limits
Typ.
5.0
5.5
Max.
5.5
11.0
3.0
6.0
mA
1.0
2.0
mA
20.0
40.0
µA
0.9
1.8
mA
0.3
0.6
mA
4.5
9.0
µA
0.1
1.0
µA
10.0
µA
0.8
1.6
mA
3
2.5
6
3.5
µA
MHz
Unit
V
mA
Note: When normal drivability (drivability selection bit 1 = “0”, drivability selection bit 2 = “0”) is selected.
47
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 17 A-D converter characteristics
(Vcc = 2.2 to 5.5 V, Vss = 0 V, Ta = –20 to 85°C, f(XIN) ≤ 4 MHz, in middle-speed/high-speed mode)
Symbol
—
—
tconv
IIA
Parameter
Test conditions
Resolution
Absolute accuracy
(excluding quantization error)
Conversion time
Analog port input current
Limits
Typ.
Min.
VCC = 2.7–5.5 V
VCC = 2.5–2.7 V (Ta = –10 to 50 °C)
f(XIN) = 4 MHz (Note)
30.5
0.5
Max.
10
±4
±6
34
5.0
Unit
Bits
LSB
LSB
µs
µA
Note: When main clock is selected as system clock.
Table 18 Timing requirements 1 (Vcc = 4.0 to 5.5 V, Vss = 0 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
tw(RESET)
tc(XIN)
twH(XIN)
twL(XIN)
tc(CNTR)
twH(CNTR)
twL(CNTR)
twH(INT)
twL(INT)
tc(SCLK)
twH(SCLK)
twL(SCLK)
tsu(RxD-SCLK)
th(SCLK-RxD)
Parameter
Reset input “L” pulse width
Main clock input cycle time (XIN input)
Main clock input “H” pulse width
Main clock input “L” pulse width
CNTR0, CNTR1 input cycle time
CNTR0, CNTR1 input “H” pulse width
CNTR0, CNTR1 input “L” pulse width
INT0, INT1 input “H” pulse width
INT0, INT1 input “L” pulse width
Serial I/O clock input cycle time
Serial I/O clock input “H” pulse width
Serial I/O clock input “L” pulse width
Serial I/O input setup time
Serial I/O input hold time
(Note)
(Note)
(Note)
Min.
2
125
45
40
250
105
105
80
80
800
370
370
220
100
Limits
Typ.
Max.
Unit
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note: When bit 6 of address 001A16 is “1”.
Divide this value by four when bit 6 of address 001A16 is “0”.
Table 19 Timing requirements 2 (mask ROM version) (Vcc = 2.2 to 4.0 V, Vss = 0 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
tw(RESET)
tc(XIN)
twH(XIN)
twL(XIN)
tc(CNTR)
twH(CNTR)
twL(CNTR)
twH(INT)
twL(INT)
tc(SCLK)
twH(SCLK)
twL(SCLK)
tsu(RxD-SCLK)
th(SCLK-RxD)
Parameter
Reset input “L” pulse width
Main clock input cycle time (XIN input) Vcc = 2.7 to 4.0 V
Main clock input cycle time (XIN input) Vcc = 2.2 to 2.7 V
Main clock input “H” pulse width Vcc = 2.7 to 4.0 V
Main clock input “H” pulse width Vcc = 2.2 to 2.7 V
Main clock input “L” pulse width Vcc = 2.7 to 4.0 V
Main clock input “L” pulse width Vcc = 2.2 to 2.7 V
CNTR0, CNTR1 input cycle time
CNTR0, CNTR1 input “H” pulse width
CNTR0, CNTR1 input “L” pulse width
INT0, INT1 input “H” pulse width
INT0, INT1 input “L” pulse width
Serial I/O clock input cycle time
(Note)
Serial I/O clock input “H” pulse width
(Note)
Serial I/O clock input “L” pulse width
(Note)
Serial I/O input setup time
Serial I/O input hold time
Note: When bit 6 of address 001A16 is “1”.
Divide this value by four when bit 6 of address 001A16 is “0”.
48
Limits
Min.
2
125
250
45
100
40
100
2/f(XIN)
tc(CNTR)/2–20
tc(CNTR)/2–20
230
230
2000
950
950
400
200
Typ.
Max.
Unit
µs
ns
ns
ns
ns
ns
ns
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 20 Timing requirements 2 (One Time PROM version) (Vcc = 2.5 to 4.0 V, Vss = 0 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
tw(RESET)
tc(XIN)
twH(XIN)
twL(XIN)
tc(CNTR)
twH(CNTR)
twL(CNTR)
twH(INT)
twL(INT)
tc(SCLK)
twH(SCLK)
twL(SCLK)
tsu(RxD-SCLK)
th(SCLK-RxD)
Parameter
Reset input “L” pulse width
Main clock input cycle time (XIN input) Vcc = 2.7 to 4.0 V
Main clock input cycle time (XIN input) Vcc = 2.5 to 2.7 V
Main clock input “H” pulse width Vcc = 2.7 to 4.0 V
Main clock input “H” pulse width Vcc = 2.5 to 2.7 V
Main clock input “L” pulse width Vcc = 2.7 to 4.0 V
Main clock input “L” pulse width Vcc = 2.5 to 2.7 V
CNTR0, CNTR1 input cycle time
CNTR0, CNTR1 input “H” pulse width
CNTR0, CNTR1 input “L” pulse width
INT0, INT1 input “H” pulse width
INT0, INT1 input “L” pulse width
Serial I/O clock input cycle time
(Note)
Serial I/O clock input “H” pulse width
(Note)
Serial I/O clock input “L” pulse width
(Note)
Serial I/O input setup time
Serial I/O input hold time
Limits
Min.
2
125
250
45
100
40
100
2/f(XIN)
tc(CNTR)/2–20
tc(CNTR)/2–20
230
230
2000
950
950
400
200
Typ.
Max.
Unit
µs
ns
ns
ns
ns
ns
ns
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note: When bit 6 of address 001A16 is “1”.
Divide this value by four when bit 6 of address 001A16 is “0”.
49
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 21 Switching characteristics 1 (Vcc = 4.0 to 5.5 V, Vss = 0 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
twH(SCLK)
twL(SCLK)
td(SCLK-TxD)
tV(SCLK-TxD)
tr(SCLK)
tf(SCLK)
tr(CMOS)
tf(CMOS)
Limits
Parameter
Serial I/O clock output “H” pulse width
Serial I/O clock output “L” pulse width
Serial I/O output delay time
Serial I/O output valid time
Serial I/O clock output rising time
Serial I/O clock output falling time
CMOS output rising time
CMOS output falling time
Min.
tc(SCLK)/2–30
tc(SCLK)/2–30
(Note 1)
(Note 1)
Typ.
Max.
140
–30
(Note 2)
(Note 2)
30
30
30
30
10
10
Unit
ns
ns
ns
ns
ns
ns
ns
ns
Notes 1: When the P45/TxD P-channel output disable bit of the UART control register (bit 4 of address 001B16) is “0”.
2: The XOUT and XCOUT pins are excluded.
Table 22 Switching characteristics 2 (Vcc = 2.2 to 4.0 V, Vss = 0 V, Ta = –20 to 85°C, unless otherwise noted)
Symbol
twH(SCLK)
twL(SCLK)
td(SCLK-TxD)
tV(SCLK-TxD)
tr(SCLK)
tf(SCLK)
tr(CMOS)
tf(CMOS)
Limits
Parameter
Serial I/O clock output “H” pulse width
Serial I/O clock output “L” pulse width
Serial I/O output delay time
Serial I/O output valid time
Serial I/O clock output rising time
Serial I/O clock output falling time
CMOS output rising time
CMOS output falling time
Min.
tC(SCLK)/2–50
tC(SCLK)/2–50
(Note 1)
(Note 1)
Typ.
Max.
350
–30
(Note 2)
(Note 2)
50
50
50
50
20
20
Notes 1: When the P45/TxD P-channel output disable bit of the UART control register (bit 4 of address 001B16) is “0”.
2: The XOUT and XCOUT pins are excluded.
1 kΩ
Measurement output pin
100 pF
Measurement output pin
100 pF
CMOS output
N-channel open-drain output (Note)
Note: When bit 4 of the UART control register
(address 001B16) is “1”. (N-channel opendrain output mode)
Fig. 46 Circuit for measuring output switching characteristics
50
Unit
ns
ns
ns
ns
ns
ns
ns
ns
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
tC(CNTR)
tWL(CNTR)
tWH(CNTR)
CNTR0, CNTR1
0.8VCC
0.2VCC
tWL(INT)
tWH(INT)
INT0, INT1
0.8VCC
0.2VCC
tW(RESET)
RESET
0.8VCC
0.2VCC
tC(XIN)
tWL(XIN)
tWH(XIN)
0.8VCC
XIN
0.2VCC
tC(SCLK)
tf
SCLK
tWL(SCLK)
tr
tWH(SCLK)
0.8VCC
0.2VCC
tsu(RXD-SCLK)
th(SCLK-RXD)
0.8VCC
0.2VCC
R XD
td(SCLK-TXD)
tv(SCLK-TXD)
T XD
Fig. 47 Timing diagram
51
MITSUBISHI MICROCOMPUTERS
38C8 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PACKAGE OUTLINE
MMP
EIAJ Package Code
LQFP144-P-2020-0.50
Plastic 144pin 20✕20mm body LQFP
Weight(g)
1.23
JEDEC Code
–
Lead Material
Cu Alloy
MD
e
144P6Q-A
b2
D
144
ME
HD
109
1
l2
Recommended Mount Pad
108
36
A
A1
A2
b
c
D
E
e
HD
HE
L
L1
Lp
HE
E
Symbol
73
37
72
A
L1
F
e
x
M
L
Detail F
Lp
c
b
A1
y
A3
A2
A3
x
y
b2
I2
MD
ME
Dimension in Millimeters
Min
Nom
Max
–
–
1.7
0.125
0.2
0.05
–
–
1.4
0.17
0.22
0.27
0.105
0.125
0.175
19.9
20.0
20.1
19.9
20.0
20.1
0.5
–
–
21.8
22.0
22.2
21.8
22.0
22.2
0.35
0.5
0.65
1.0
–
–
0.45
0.6
0.75
–
0.25
–
–
–
0.08
0.1
–
–
0°
8°
–
0.225
–
–
0.95
–
–
20.4
–
–
–
–
20.4
Keep safety first in your circuit designs!
•
Mitsubishi Electric Corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to
personal injury, fire or property damage. Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of non-flammable
material or (iii) prevention against any malfunction or mishap.
•
These materials are intended as a reference to assist our customers in the selection of the Mitsubishi semiconductor product best suited to the customer’s application; they do not convey any license under any intellectual property
rights, or any other rights, belonging to Mitsubishi Electric Corporation or a third party.
Mitsubishi Electric Corporation assumes no responsibility for any damage, or infringement of any third-party’s rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or circuit application examples
contained in these materials.
All information contained in these materials, including product data, diagrams, charts, programs and algorithms represents information on products at the time of publication of these materials, and are subject to change by
Mitsubishi Electric Corporation without notice due to product improvements or other reasons. It is therefore recommended that customers contact Mitsubishi Electric Corporation or an authorized Mitsubishi Semiconductor product
distributor for the latest product information before purchasing a product listed herein.
The information described here may contain technical inaccuracies or typographical errors. Mitsubishi Electric Corporation assumes no responsibility for any damage, liability, or other loss rising from these inaccuracies or errors.
Please also pay attention to information published by Mitsubishi Electric Corporation by various means, including the Mitsubishi Semiconductor home page (http://www.mitsubishichips.com).
When using any or all of the information contained in these materials, including product data, diagrams, charts, programs, and algorithms, please be sure to evaluate all information as a total system before making a final decision
on the applicability of the information and products. Mitsubishi Electric Corporation assumes no responsibility for any damage, liability or other loss resulting from the information contained herein.
Mitsubishi Electric Corporation semiconductors are not designed or manufactured for use in a device or system that is used under circumstances in which human life is potentially at stake. Please contact Mitsubishi Electric
Corporation or an authorized Mitsubishi Semiconductor product distributor when considering the use of a product contained herein for any specific purposes, such as apparatus or systems for transportation, vehicular, medical,
aerospace, nuclear, or undersea repeater use.
The prior written approval of Mitsubishi Electric Corporation is necessary to reprint or reproduce in whole or in part these materials.
If these products or technologies are subject to the Japanese export control restrictions, they must be exported under a license from the Japanese government and cannot be imported into a country other than the approved
destination.
Any diversion or reexport contrary to the export control laws and regulations of Japan and/or the country of destination is prohibited.
Please contact Mitsubishi Electric Corporation or an authorized Mitsubishi Semiconductor product distributor for further details on these materials or the products contained therein.
Notes regarding these materials
•
•
•
•
•
•
•
© 2002MITSUBISHI ELECTRIC CORP.
New publication, effective Oct. 2002.
Specifications subject to change without notice.
REVISION HISTORY
Rev.
38C8 GROUP DATA SHEET
Date
Description
Summary
Page
1.0
01/18/01
1.1
03/21/01
First Edition
2
3
4
14
17
26
33
34
37
37
40
41
42
42
Figure 1 is partly revised.
Figure 2 is partly revised.
Pin name into Table 1 is partly revised.
Pin name into Table 5 is partly revised.
Explanations of “Interrupt Operation” are partly eliminated.
Address of [Baud Rate Generator (BRG)] is revised.
Figure name of Figure 31 is partly revised.
Figure name of Figure 32 is partly revised.
Explanations of “CLOCK GENERATING CIRCUIT” are partly revised.
Explanations of “(1) Middle-speed Mode” of “Frequency Control” are partly revised.
“At STP Instruction Release” is eliminated.
Explanations of “DATA REQUIRED FOR MASK ORDERS” are partly revised.
Pin name of VIA into Table 11 is revised.
Limits of VIH, VIL of P40, P43 are revised.
1.2
10/15/01
3
15
16
41
42
43
43
43
43
43
46
46
47
Figure 2 is partly revised.
Figure 11 is partly revised.
Figure 12 is partly revised.
Table 10 is added.
Vcc parameter into Table 12 is partly eliminated.
Unit of f(CNTR0), f(CNTR1) into Table 13 is revised.
Limits of f(XIN) in high-speed mode (2.2 V ≤ Vcc < 4.0 V) into Table 13 is revised.
f(XIN) in middle-speed mode (2.2 V ≤ Vcc < 2.7 V) into Table 13 is added.
Unit of f(CNTR0), f(CNTR1) into Table 14 is revised.
f(XIN) in middle-speed mode (2.5 V ≤ Vcc < 2.7 V) into Table 14 is added.
Limits of tc(XIN), tWH(XIN), tWL(XIN) into Table 19 are added.
Limits and unit of tc(CNTR) into Table 19 are revised.
Table 20 is added.
1.3
12/05/01
3
14
17
18
28
28
28
40
Figure 2 is partly revised.
Table 5 is partly revised.
Explanations of “■Notes on interrupts” are partly revised.
Figure 14 is partly revised.
Explanations of “[A-D Control Register (ADCON)]” are partly revised.
Explanations of “Comparator and Control Circuit” are partly revised.
Figure 25 is partly revised.
Explanations of “A-D Converter” of “NOTES ON PROGRAMMING” are partly revised.
1.4
06/25/02
All pages
1
3
4
6
8
9
10
11
14
Preliminary Notice in the header is eliminated.
Interrupts of “[FEATURES]” are corrected.
Figure 2 is partly revised.
Pin COM0–COM15 in Table 1 is revised.
Figure 4 is partly revised.
Note in Figure 4 is partly revised.
Explanations of bit 3 are added.
Bit 4 name in Figure 7 is revised.
Remarks in Figure 7 are partly revised.
Table 5 is partly revised.
(1/2)
REVISION HISTORY
Rev.
38C8 GROUP DATA SHEET
Date
Description
Summary
Page
1.4
06/25/02
15
17
19
20
20
21
25
30
31
31
32
35
37
38
39
40
41, 42
44
46
47
(1) in Figure 11 is partly revised.
Some source numbers in “[INTERRUPTS]” are corrected.
Figure 15 is partly revised.
The mode name (buzzer output mode) in Figure 16 is corrected.The mode name
of bit 6 in Figure 17 is corrected.
Explanations of “[(2) Buzzer Output Mode]” are partly added.
f(XCIN) in Figure 22 is added.
Explanations of “[LC2]” are partly revised.
Explanations of “[Bias Control]” and “[Voltage Multiplier]” are partly revised.
Table 8 is partly revised.
Explanations of “[LCD Display RAM]” is partly revised.
Note in Figure 33 is eliminated.
Explanations of “[(1) Stop Mode]” is partly revised.
Note in Figure 38 is partly revised.
Bit 4 name in Figure 39 is revised.
Explanations of “[A-D Converter]” is partly revised.
“[NOTES ON USE]” is added.
Table 12 is partly revised.
Table 15 is partly revised.
Table 16 is partly revised.
1.5
10/23/02
15
(3), (4) and (5) in Figure 11 are partly revised.
(2/2)
Similar pages