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38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
DESCRIPTION
The 38B5 group is the 8-bit microcomputer based on the 740 family
core technology.
The 38B5 group has six 8-bit timers, a 16-bit timer, a fluorescent
display automatic display circuit, 12-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 38B5 group has variations of internal memory size and packag-
ing. For details, refer to the section on part numbering.
For details on availability of microcomputers in the 38B5 group, refer
to the section on group expansion.
•
•
•
•
•
•
•
•
FEATURES
•
Basic machine-language instructions ....................................... 71
•
The minimum instruction execution time .......................... 0.48
µs
•
•
•
•
•
•
•
•
(at 4.19 MHz oscillation frequency)
Memory size
ROM ............................................. 24K to 60K bytes
RAM ............................................ 512 to 2048 bytes
Programmable input/output ports ............................................. 55
High-breakdown-voltage output ports ....................................... 36
Software pull-up resistors ...... (Ports P5, P6
1
to P6
5
, P7, P8
4
to P8
7
, P9)
Interrupts .................................................. 21 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
•
•
PWM ............................................................................. 14-bit
!
1
8-bit
!
1 (also functions as timer 6)
A-D converter .............................................. 10-bit
!
12 channels
Fluorescent display function ........................ Total 40 control pins
Interrupt interval determination function ..................................... 1
Watchdog timer ............................................................. 20-bit
!
1
Buzzer output ............................................................................. 1
2 Clock generating circuit
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 and low-speed selected)
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
APPLICATION
Musical instruments, VCR, household appliances, etc.
PIN CONFIGURATION (TOP VIEW)
P2
0
/B
UZ02
/FLD
0
P2
1
/FLD
1
P2
2
/FLD
2
P2
3
/FLD
3
P2
4
/FLD
4
P2
5
/FLD
5
P2
6
/FLD
6
P2
7
/FLD
7
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
62
61
60
59
58
57
56
55
54
53
52
51
64
63
50
49
48
47
46
45
44
43
42
41
P5
7
/S
RDY2/
S
CLK22
P5
6
/S
CLK21
P5
5
/TxD
P5
4
/RxD
P5
3
/S
CLK12
P5
2
/S
CLK11
P5
1
/S
OUT1
P5
0
/S
IN1
AV
SS
V
REF
P6
5
/S
STB1
/AN
11
P6
4
/INT
4
/S
BUSY1
/AN
10
P6
3
/AN
9
P6
2
/S
RDY1
/AN
8
P7
7
/AN
7
P7
6
/AN
6
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
M38B57MC-XXXFP
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
P8
0
/FLD
32
P8
1
/FLD
33
P8
2
/FLD
34
P8
3
/FLD
35
V
EE
P8
4
/FLD
36
P8
5
/RTP
0
/FLD
37
P8
6
/RTP
1
/FLD
38
4
5
6
7
8
9
10
2
3
11
12
Fig. 1 Pin Configuration of M38B57MC-XXXFP
P7
5
/AN
5
P7
4
/AN
4
P7
3
/AN
3
P7
2
/AN
2
P7
1
/AN
1
P7
0
/AN
0
P6
1
/CNTR
0
/CNTR
2
P6
0
/CNTR
1
P4
7
/INT
2
RESET
P9
1
/X
COUT
P9
0
/X
CIN
Vss
X
IN
X
OUT
Vcc
P4
6
/T
3OUT
P4
5
/T
1OUT
P4
4
/PWM
1
P4
3
/B
UZ01
P4
2
/INT
3
P4
1
/INT
1
P4
0
/INT
0
P8
7
/PWM
0
/FLD
39
Package type : 80P6N-A
80-pin plastic-molded QFP
13
14
15
16
17
18
19
20
21
22
23
24
1
2
FUNCTIONAL BLOCK DIAGRAM (Package : 80P6N-A)
I/O ports
Port P1(8)
Port P2(8)
Port P3(8)
Port P4(8)
8
8
8
8
1
7
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FUNCTIONAL BLOCK
Fig. 2 Functional Block Diagram
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Port P0(8)
Build-in peripheral functions
Timers
System clock generation
A-D converter
(10-bit
!
12 channel)
Serial I/O
X
IN
-X
OUT
(main-clock)
X
CIN
-X
COUT
(sub-clock)
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)
PWM1(8-bit)
Memory
CPU core
ROM
PWM0(14-bit)
Buzzer output
Watchdog timer
RAM
Interrupt interval
determination function
FLD display function
40 control pins
(36 high-breakdown voltage ports)
Port P5(8)
6
Port P6(6)
Port P7(8)
8
Port P8(8)
8
Port P9(2)
2
MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
8
MITSUBISHI MICROCOMPUTERS
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38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Table 1 Pin Description (1)
Pin
V
CC
, V
SS
V
EE
V
REF
AV
SS
______
Name
Power source
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
.
• Apply voltage supplied to pull-down resistors of ports P0, P1, 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.
• Feedback resistor is built in between X
IN
pin and X
OUT
pin.
Function except a port function
RESET
X
IN
X
OUT
Clock output
• 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 I/O port.
• I/O direction register allows each pin to be individually programmed as either
input or output.
• At reset, this port is set to input mode.
• A pull-down resistor is built in between port P0 and the V
EE
pin.
• CMOS compatible input level.
• High-breakdown-voltage P-channel open-drain output structure.
• At reset, this port is set to V
EE
level.
• 8-bit output port.
• A pull-down resistor is built in between port P1 and the V
EE
pin.
• High-breakdown-voltage P-channel open-drain output structure.
• At reset, this port is set to V
EE
level.
• FLD automatic display
pins
P0
0
/FLD
8
–
P0
7
/FLD
15
I/O port P0
P1
0
/FLD
16
– Output port P1
P1
7
/FLD
23
• FLD automatic display
pins
P2
0
/B
UZ02
/
FLD
0
–
P2
7
/FLD
7
I/O port P2
• 8-bit I/O port with the same function as port P0.
• Low-voltage input level.
• High-breakdown-voltage P-channel open-drain output structure.
• 8-bit output port.
• A pull-down resistor is built in between port P3 and the V
EE
pin.
• High-breakdown-voltage P-channel open-drain output structure.
• At reset, this port is set to V
EE
level.
• 7-bit I/O port with the same function as port P0.
• CMOS compatible input level.
• N-channel open-drain output structure.
• FLD automatic display
pins
• Buzzer output pin (P2
0
)
• FLD automatic display
pins
P3
0
/FLD
24
– Output port P3
P3
7
/FLD
31
P4
0
/INT
0
,
P4
1
/INT
1
,
P4
2
/INT
3
P4
3
/B
UZ01
P4
4
/PWM
1
P4
5
/T
1OUT
,
P4
6
/T
3OUT
P4
7
/INT
2
I/O port P4
• Interrupt input pins
• Buzzer output pin
• PWM output pin
(Timer output pin)
• Timer output pin
Input port P4
• 1-bit input port.
• CMOS compatible input level.
• Interrupt input pin
3
MITSUBISHI MICROCOMPUTERS
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38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Table 2 Pin Description (2)
Pin
P5
0
/S
IN1
,
P5
1
/S
OUT1
,
P5
2
/S
CLK11
,
P5
3
/S
CLK12
P5
4
/R
X
D,
P5
5
/T
X
D,
P5
6
/S
CLK21
,
________
Name
I/O port P5
• CMOS compatible input level.
Function
• 8-bit CMOS I/O port with the same function as port P0.
• CMOS 3-state output structure.
Function except a port function
• Serial I/O1 function pins
• Serial I/O2 function pins
P5
7
/S
RDY2
/
S
CLK22
P6
0
/CNTR
1
I/O port P6
• 1-bit I/O port with the same function as port P0.
• CMOS compatible input level.
• N-channel open-drain output structure.
P6
1
/CNTR
0
/
CNTR
2
________
• Timer input pin
• 5-bit CMOS I/O port with the same function as port P0.
• CMOS compatible input level.
• CMOS 3-state output structure.
• Timer I/O pin
• Serial I/O1 function pin
• A-D conversion input pin
• A-D conversion input pin
• Serial I/O1 function pin
• A-D conversion input pin
• Interrupt input pin (P6
4
)
P6
2
/S
RDY1
/
AN
8
P6
3
/AN
9
P6
4
/INT
4
/
S
BUSY1
/AN
10
,
P6
5
/S
STB1
/
AN
11
P7
0
/AN
0
–
P7
7
/AN
7
P8
0
/FLD
32
– I/O port P8
P8
3
/FLD
35
P8
4
/FLD
36
P8
5
/RTP
0
/
FLD
37,
P8
6
/RTP
1
/
FLD
38
P8
7
/PWM
0
/
FLD
39
P9
0
/X
CIN
,
P9
1
/X
COUT
I/O port P9
I/O port P7
• 8-bit CMOS I/O port with the same function as port P0.
• CMOS compatible input level.
• CMOS 3-state output structure.
• 4-bit I/O port with the same function as port P0.
• Low-voltage input level.
• High-breakdown-voltage P-channel open-drain output structure.
• 4-bit CMOS I/O port with the same function as port P0.
• Low-voltage input level.
• A-D conversion input pin
• FLD automatic display pins
• FLD automatic display pins
• FLD automatic display pins
• 14-bit PWM output
• 2-bit CMOS I/O port with the same function as port P0.
• CMOS compatible input level.
• CMOS 3-state output structure.
•
I/O pins for sub-clock generating
circuit (connect a ceramic resona-
tor or a quarts-crystal oscillator)
4
MITSUBISHI MICROCOMPUTERS
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38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PART NUMBERING
Product
M38B5
7 M C
-
XXX FP
Package type
FP : 80P6N-A package
FS : 80D0 package
ROM number
Omitted in some types.
ROM/PROM size
1 : 4096 bytes
2 : 8192 bytes
3 : 12288 bytes
4 : 16384 bytes
5 : 20480 bytes
6 : 24576 bytes
7 : 28672 bytes
8 : 32768 bytes
9 : 36864 bytes
A : 40960 bytes
B : 45056 bytes
C : 49152 bytes
D : 53248 bytes
E : 57344 bytes
F : 61440 bytes
The first 128 bytes and the last 2 bytes of ROM
are reserved areas ; they cannot be used for
users.
Memory type
M : Mask ROM version
E : EPROM or 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
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