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2

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

FUNCTIONAL BLOCK DIAGRAM

Fig. 2 Functional block diagram

Key-on wake-up

INT

0

–INT

2

CNTR

0

,CNTR

1

T1

OUT,

T3

OUT

φ

Data bus

C P U

A

X

Y

S

PC

H

PC

L

PS

RESET

V

CC

V

SS

Reset input ( 5 V ) ( 0 V )

R O M

R A M

LCD display

RAM

(16 bytes)

10 16

13

I/O port P5

P4(8)

I/O port P4

I/O port P2

P2(8)

I/O port P1

P1(8)

P6(8)

Output port P3

I/O port P6

P5(8)

I/O port P7

P7(2)

28

27

26

32

31

30

29

I/O port P0

P0(8)

49

50 51

52 53 54

55

5641 42 43 44 45

46 47

48

57

58

59

60

61

62 63

6467 68 69 70 71 7265

66

12

11

1

2

75 76

77

78

79

80 7374

456789

17

3

Clock generating

circuit

Main

clock

input

X

IN

Main

clock

output

X

OUT

X

COUT

Sub-

clock

output

X

CIN

Sub-

clock

input

SI/O(8)

V

REF

AV

SS

( 0 V )

A-D converter(10)

Timer 1(8) Timer 2(8)

LCD

drive control

circuit

V

L1

V

L2

V

L3

COM

0

COM

1

COM

2

COM

3

φ

X

CIN

X

COUT

14

15

Timer 3(8) Timer 4(8)

Timer 5(8) Timer 6(8)

P3(8)

33 34

35

36

37

38 39

40

R O M

corrective

circuit

ROM corrective

RAM

(8 bytes)

I/O port P8

P8(8)

18 19 20 21 22 23 24 25

PWM

0,

PWM

1

Timer A(16)

1 2 3 4 5 6 7 8 ... 63 64

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