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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
DESCRIPTION
The 38B7 group is the 8-bit microcomputer based on the 740 family
core technology.
The 38B7 group has six 8-bit timers, one 16-bit timer, a fluorescent
display automatic display circuit, 16-channel 10-bit A-D converter, a
serial I/O with automatic transfer function, which are available for
controlling musical instruments and household appliances.
The 38B7 group has variations of internal memory type. For details,
refer to the section on part numbering.
For details on availability of microcomputers in the 38B7 group, refer
to the section on group expansion.
Built-in pull-down resistors connected to high-breakdown voltage ports
are available by specifying with the mask option in the mask ROM
version. For the details, refer to the section on the mask option of
pull-down resistor.
•
•
Power dissipation
In high-speed mode .......................................................... 35 mW
(at 4.19 MHz oscillation frequency)
In low-speed mode ............................................................. 60
µW
(at 32 kHz oscillation frequency, at 3 V power source voltage)
Operating temperature range ................................... –20 to 85 °C
FEATURES
<Microcomputer mode>
Basic machine-language instructions ....................................... 71
The minimum instruction execution time .......................... 0.48
µs
(at 4.19 MHz oscillation frequency)
Memory size
ROM ........................................................ 60K bytes
RAM .......................................................2048 bytes
Programmable input/output ports ............................................. 75
High-breakdown-voltage output ports ...................................... 52
Software pull-up resistors . (Ports P6
4
to P6
7
, P7, P8
0
to P8
3
, P9,
PA, PB)
Interrupts .................................................. 22 sources, 16 vectors
Timers ........................................................... 8-bit
✕
6, 16-bit
✕
1
Serial I/O1 (Clock-synchronized) ................................... 8-bit
✕
1
(max. 256-byte automatic transfer function)
Serial I/O2 (UART or Clock-synchronized) .................... 8-bit
✕
1
Serial I/O3 (Clock-synchronized) ................................... 8-bit
✕
1
PWM ............................................................................ 14-bit
✕
1
8-bit
✕
1 (also functions as timer 6)
A-D converter .............................................. 10-bit
✕
16 channels
D-A converter ................................................................ 1 channel
Fluorescent display function ......................... Total 56 control pins
Interrupt interval determination function ..................................... 1
(Serviceable even in low-speed mode)
Watchdog timer ............................................................ 16-bit
✕
1
Buzzer output ............................................................................. 1
Two clock generating circuits
Main clock (X
IN
–X
OUT
) .......................... Internal feedback resistor
Sub-clock (X
CIN
–X
COUT
) .......... Without internal feedback resistor
(connect to external ceramic resonator or quartz-crystal oscillator)
Power source voltage
In high-speed mode ................................................... 4.0 to 5.5 V
(at 4.19 MHz oscillation frequency and high-speed selected)
In middle-speed mode ........................................... 2.7 to 5.5 V (*)
(at 4.19 MHz oscillation frequency and middle-speed selected)
In low-speed mode ................................................ 2.7 to 5.5 V (*)
(at 32 kHz oscillation frequency)
(*: 4.0 to 5.5 V for Flash memory version)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
<Flash memory mode>
qSupply
voltage ................................................. V
CC
= 5 V ± 10 %
qProgram/Erase
voltage ............................... V
PP
= 11.7 to 12.6 V
qProgramming
method ...................... Programming in unit of byte
qErasing
method
Batch erasing ........................................ Parallel/Serial I/O mode
Block erasing .................................... CPU reprogramming mode
qProgram/Erase
control by software command
qNumber
of times for programming/erasing ............................ 100
qOperating
temperature range (at programming/erasing)
..................................................................... Normal temperature
sNotes
1. The flash memory version cannot be used for application em-
bedded in the MCU card.
2. Power source voltage Vcc of the flash memory version is 4.0
to 5.5 V.
APPLICATION
Musical instruments, VCR, household appliances, etc.
•
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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN CONFIGURATION (TOP VIEW)
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
*P2
7
/FLD
7
*P2
6
/FLD
6
*P2
5
/FLD
5
*P2
4
/FLD
4
*P2
3
/FLD
3
*P2
2
/FLD
2
*P2
1
/FLD
1
*P2
0
/FLD
0
V
E E
PB
6
/S
IN1
PB
5
/S
OUT1
PB
4
/S
CLK11
PB
3
/S
STB1
PB
2
/S
BUSY1
PB
1
/S
RDY1
PB
0
/S
CLK12
/DA
AV
SS
V
REF
PA
7
/AN
7
PA
6
/AN
6
55
54
53
52
51
*P0
0
/FLD
8
*P0
1
/FLD
9
*P0
2
/FLD
10
*P0
3
/FLD
11
*P0
4
/FLD
12
*P0
5
/FLD
13
*P0
6
/FLD
14
*P0
7
/FLD
15
*P1
0
/FLD
16
*P1
1
/FLD
17
*P1
2
/FLD
18
*P1
3
/FLD
19
*P1
4
/FLD
20
*P1
5
/FLD
21
*P1
6
/FLD
22
*P1
7
/FLD
23
*P3
0
/FLD
24
*P3
1
/FLD
25
*P3
2
/FLD
26
*P3
3
/FLD
27
*P3
4
/FLD
28
*P3
5
/FLD
29
*P3
6
/FLD
30
*P3
7
/FLD
31
*P4
0
/FLD
32
*P4
1
/FLD
33
*P4
2
/FLD
34
*P4
3
/FLD
35
*P4
4
/FLD
36
*P4
5
/FLD
37
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
M38B79MFH-XXXXFP
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
*P4
6
/FLD
38
*P4
7
/FLD
39
*P5
0
/FLD
40
*P5
1
/FLD
41
*P5
2
/FLD
42
*P5
3
/FLD
43
*P5
4
/FLD
44
*P5
5
/FLD
45
*P5
6
/FLD
46
*P5
7
/FLD
47
*P6
0
/FLD
48
*P6
1
/FLD
49
*P6
2
/FLD
50
*P6
3
/FLD
51
P6
4
/RxD/FLD
52
P6
5
/TxD/FLD
53
P6
6
/S
CLK21
/FLD
54
P6
7
/S
RDY2
/S
CLK22
/FLD
55
P7
0
/INT
0
P7
1
/INT
1
Fig. 1 Pin configuration of M38B79MFH-XXXXFP
2
PA
5
/AN
5
PA
4
/AN
4
PA
3
/AN
3
PA
2
/AN
2
PA
1
/AN
1
PA
0
/AN
0
P9
7
/B
UZ02
/AN
15
P9
6
/PWM
0
/AN
14
P9
5
/RTP
0
/AN
13
P9
4
/RTP
1
/AN
12
P9
3
/S
RDY3
/AN
11
P9
2
/S
CLK3
/AN
10
P9
1
/S
OUT3
/AN
9
P9
0
/S
IN3
/AN
8
P8
3
/CNTR
0
/CNTR
2
P8
2
/CNTR
1
CNV
SS
RESET
P8
1
/X
COUT
P8
0
/X
CIN
V
S S
X
IN
X
OUT
V
CC
P7
7
/INT
4
/B
UZ01
P7
6
/T3
OUT
P7
5
/T1
OUT
P7
4
/PWM
1
P7
3
/INT
3
/DIM
OUT
P7
2
/INT
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
*
High-breakdown-voltage output port: Totaling 52
Package type: 100P6S-A
FUNCTIONAL BLOCK DIAGRAM
8
8
8
8
Port P4(8)
Port P5(8)
Port P3(8)
Port P2(8)
Port P1(8)
8
I/O ports
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Fig. 2 Functional block diagram
Port P0(8)
Build-in peripheral functions
Timers
System clock generation
A-D converter
(10-bit
✕
12 channel)
Serial I/Os
Serial I/O1
(Clock-synchronized)
(256 byte automatic transfer)
Serial I/O2
(Clock-synchronized or UART)
Timer X(16-bit)
Timer 1(8-bit)
Timer 2(8-bit)
Timer 3(8-bit)
Timer 4(8-bit)
Timer 5(8-bit)
Timer 6(8-bit)
X
IN
-X
OUT
(main-clock)
X
CIN
-X
COUT
(sub-clock)
Serial I/O3
(Clock-synchronized)
PWM1(8-bit)
Me mo r y
CPU core
ROM
PWM0(14-bit)
Buzzer output
Watchdog timer
RAM
Interrupt interval
determination function
FLD display function
56 control pins
(52 high-breakdown
voltage ports)
Port P6(8)
Port P7(8)
8
Port P8(4)
4
Port P9(8)
8
Port PA(8)
8
Port PB(7)
7
8
MITSUBISHI MICROCOMPUTERS
38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 1 Pin description (1)
Pin
V
CC
, V
SS
CNV
SS
V
EE
V
REF
AV
SS
______
Name
Power source
CNV
SS
Pull-down
power source
Reference voltage
Analog power
source
Reset input
Clock input
Function
• Apply voltage of 4.0–5.5 V to V
CC
,
and 0 V to V
SS
.
• Connect to V
SS
.
• VPP power input pin in flash memory mode.
• Apply voltage supplied to pull-down resistors of ports P0, P1, P2 and P3.
• Reference voltage input pin for A-D converter.
• Analog power source input pin for A-D converter.
• Connect to V
SS
.
• Reset input pin for active “L”.
• Input and output pins for the main clock generating circuit.
Function except a port function
RESET
X
IN
X
OUT
Clock output
P0
0
/FLD
8
–
P0
7
/FLD
15
Output port P0
• Feedback resistor is built in between X
IN
pin and X
OUT
pin.
• Connect a ceramic resonator or quartz-crystal oscillator between the X
IN
and X
OUT
pins to set the
oscillation frequency.
• When an external clock is used, connect the clock source to the X
IN
pin and leave the X
OUT
pin open.
• The clock is used as the oscillating source of system clock.
• 8-bit output port.
• FLD automatic display
• High-breakdown-voltage P-channel open-drain output structure.
• A pull-down resistor is built in between port P0 and the V
EE
pin.
• At reset, this port is set to V
EE
level.
pins
P1
0
/FLD
16
– I/O port P1
P1
7
/FLD
23
• 8-bit I/O port.
• FLD automatic display
• I/O direction register allows each pin to be individually programmed as either pins
input or output.
• At reset, this port is set to input mode.
• Low-voltage input level.
• High-breakdown-voltage P-channel open-drain output structure.
• A pull-down resistor is built in between port P1 and the V
EE
pin.
• At reset, this port is set to V
EE
level.
• 8-bit output port with the same function as port P0.
• High-breakdown-voltage P-channel open-drain output structure.
• A pull-down resistor is built in between port P2 and the V
EE
pin.
• At reset, this port is set to V
EE
level.
• 8-bit I/O port with the same function as port P1.
• Low-voltage input level.
• High-breakdown-voltage P-channel open-drain output structure.
• A pull-down resistor is built in between port P3 and the V
EE
pin.
• At reset, this port is set to V
EE
level.
• 8-bit I/O port with the same function as port P1.
• Low-voltage input level.
• High-breakdown-voltage P-channel open-drain output structure.
• A pull-down resistor is not built in between port P4 and the V
EE
pin.
• 8-bit I/O port with the same function as port P1.
• Low-voltage input level.
• High-breakdown-voltage P-channel open-drain output structure.
• A pull-down resistor is not built in between port P5 and the V
EE
pin.
• 4-bit I/O port with the same function as port P1.
• Low-voltage input level.
• High-breakdown-voltage P-channel open-drain output structure.
• A pull-down resistor is not built in between port P6 and the V
EE
pin.
P2
0
/FLD
0
–
P2
7
/FLD
7
Output port P2
• FLD automatic display
pins
P3
0
/FLD
24
–
P3
7
/FLD
31
I/O port P3
• FLD automatic display
pins
P4
0
/FLD
32
– I/O port P4
P4
7
/FLD
39
• FLD automatic display
pins
P5
0
/FLD
40
– I/O port P5
P5
7
/FLD
47
• FLD automatic display
pins
P6
0
/FLD
48
– I/O port P6
P6
3
/FLD
51
• FLD automatic display
pins
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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 2 Pin description (2)
Pin
P6
4
/R
X
D/FLD
52
,
Name
I/O port P6
• 4-bit I/O port .
• Low-voltage input level for input ports.
• CMOS compatible input level for RxD, S
CLK21
, S
CLK22
.
• CMOS 3-state output structure.
• 8-bit I/O port.
• CMOS compatible input level.
• CMOS 3-state output structure.
• Interrupt input pin
• Dimmer signal output pin
• PWM output pin
• Timer output pins
• Interrupt input pin
• Buzzer output pin
•
I/O pins for sub-clock generating
circuit (connect a ceramic resonator
or a quarts-crystal oscillator)
Function
Function except a port function
• FLD automatic display
pins
• Serial I/O2 function pins
P6
5
/T
X
D/FLD
53
,
P6
6
/S
CLK21
/FLD
54
,
P6
7
/S
RDY2
/S
CLK22
/
FLD
55
,
P7
0
/INT
0
,
I/O port P7
P7
1
/INT
1
,
P7
2
/INT
2
,
P7
3
/INT
3
/DIM
OUT
,
P7
4
/PWM
1
P7
5
/T1
OUT
,
P7
6
/T3
OUT
,
P7
7
/INT
4
/B
UZ01
P8
0
/X
CIN
,
P8
1
/X
COUT
P8
2
/CNTR
1
,
P8
3
/CNTR
0
/CNTR
2
P9
0
/S
IN3
/AN
8
,
P9
1
/S
OUT3
/AN
9
,
P9
2
/S
CLK3
/AN
10
,
P9
3
/S
RDY3
/AN
11
,
P9
4
/RTP
1
/AN
12
,
P9
5
/RTP
0
/AN
13
P9
6
/PWM
0
/AN
14
P9
7
/B
UZ02
/AN
15
PA
0
/AN
0
–PA
7
/AN
7
I/O port PA
I/O port P9
I/O port P8
• Interrupt input pins
• 4-bit I/O port with the same function as port P7.
• CMOS compatible input level.
• CMOS 3-state output structure.
• Timer input pin
• Timer I/O pin
• 8-bit I/O port with the same function as port P7.
• CMOS compatible input level.
• CMOS 3-state output structure.
• Serial I/O3 function pins
• A-D converter input pins
• Real time port output pins
• A-D converter input pins
• 14-bit PWM output pin
• A-D converter input pin
• Buzzer output pin
• A-D converter input pin
• 8-bit I/O port with the same function as port P7.
• CMOS compatible input level.
• CMOS 3-state output structure.
• A-D converter input pin
PB
0
/S
CLK12
/DA
I/O port PB
• 7-bit I/O port with the same function as port P7.
• CMOS compatible input level.
• CMOS 3-state output structure.
• Serial I/O1 function pin
• D-A converter output pin
• Serial I/O1 function pins
PB
1
/S
RDY1
,
PB
2
/S
BUSY1
,
PB
3
/S
STB1
,
PB
4
/S
CLK11
,
PB
5
/S
OUT1
,
PB
6
/S
IN1
5
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