Technical information

3
MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
FUNCTIONAL BLOCK DIAGRAM (Package : 80P6N-A)
INT 2
CNTR
0
,CNTR
1
T
OUT
CPU
A
X
Y
S
PC
H
PC
L
PS
ROM
P0(8)
P7(2)
27
73 32
8 7 6
5 4 3 2
1
80 79 78 77 76 75 74 72 71 70 69
28 29
910
28
29
SI/O1(8)
V
L1
V
L2
V
L3
COM
0
COM
1
COM
2
COM
3
SEG
0
SEG
1
SEG
2
SEG
3
SEG
4
SEG
5
SEG
6
SEG
7
SEG
8
SEG
9
SEG
10
SEG
11
X
CIN
X
COUT
30
31
49 50 51 52 53 54 55 56
P1(8)
41 42 43 44 45 46 47 48
P2(8)
33 34 35 36 37 38 39 40
P4(8)
21 22 23 24 25 26
19 20
P5(8)
12 13 14 15 16 17 1811
φ
LCD
drive control
circuit
RAM
LCD display
RAM
(20 bytes)
Timer X(16)
Timer Y(16)
Timer 1(8) Timer 2(8)
Timer 3(8)
Data bus
Clock generating
circuit
Clock input X
IN
Clock output X
OUT
X
COUT
Sub- clock output
X
CIN
Sub- clock input
V
CC
V
SS
Reset input
(5V) (0V)
RESET
I/O port P7
P6(2)
I/O port P6
Watchdog timer
1
P3(8)
57 58 59 60 61 62 63 64
P0(8)
I/O port P0
I/O port P1
Key-on wake up
I/O port P2
Real time port function
Input port P3
φ
I/O port P4
INT 0 ,INT 1
SI/O2(8)
I/O port P5
SEG
12
SEG
13
SEG
14
SEG
15
68 67 66
65
RESET
RTP
0
,RTP
1