MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
LCD drive control circuit
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DESCRIPTION
Bias ................................................................................... 1/2, 1/3
Duty ............................................................................ 1/2, 1/3, 1/4
Common output .......................................................................... 4
Segment output ......................................................................... 40
2 Clock generating circuit
The 3820 group is the 8-bit microcomputer based on the 740 fam-
ily core technology.
The 3820 group has the LCD drive control circuit and the serial I/
O as additional functions.
The various microcomputers in the 3820 group include variations
of internal memory size and packaging. For details, refer to the
section on part numbering.
Clock (XIN-XOUT) .................................. Internal feedback resistor
Sub-clock (XCIN-XCOUT).......... Without internal feedback resistor
(connect to external ceramic resonator or quartz-crystal oscillator)
Watchdog timer ............................................................. 15-bit ✕ 1
Power source voltage
For details on availability of microcomputers in the 3820 group, re-
fer to the section on group expansion.
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In high-speed mode ....................................................4.0 to 5.5 V
(at 8MHz oscillation frequency and high-speed selected)
In middle-speed mode ................................................2.5 to 5.5 V
(at 8MHz oscillation frequency and middle-speed selected)
In low-speed mode......................................................2.5 to 5.5 V
(Extended operating temperature version: 3.0 V to 5.5 V)
Power dissipation
FEATURES
Basic machine-language instructions ....................................... 71
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The minimum instruction execution time ............................ 0.5 µs
(at 8MHz oscillation frequency)
Memory size
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ROM .................................................................. 4 K to 32 K bytes
RAM ................................................................. 192 to 1024 bytes
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In high-speed mode ........................................................... 32 mW
(at 8 MHz oscillation frequency)
Programmable input/output ports ............................................. 43
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Software pull-up/pull-down resistors (Ports P0-P7 except Port P40)
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In low-speed mode..............................................................45 µW
(at 32 kHz oscillation frequency, at 3 V power source voltage)
Operating temperature range ................................... – 20 to 85°C
(Extended operating temperature version: –40 to 85°C)
Interrupts .................................................. 16 sources, 16 vectors
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(includes key input interrupt)
Timers ........................................................... 8-bit ✕ 3, 16-bit ✕ 2
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Serial I/O1 ..................... 8-bit ✕ 1 (UART or Clock-synchronized)
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Serial I/O2 .................................... 8-bit ✕ 1 (Clock-synchronized)
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APPLICATIONS
Household appliances, consumer electronics, etc.
PIN CONFIGURATION (TOP VIEW)
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
40
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
P2
P2
P2
P2
P2
P2
P2
P2
0
1
2
3
4
5
6
7
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
SEG
9
SEG
8
M38203M4-XXXFP
M38203M4-XXXFP
V
CC
V
X
X
SS
SEG
7
OUT
IN
SEG
6
SEG
SEG
SEG
SEG
SEG
5
4
3
2
1
P7
P7
0
1
/XCOUT
/XCIN
RESET
P40
P41
/φ
1
2
3
4
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Package type : 80P6N-A
80-pin plastic molded QFP
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