38B5 datasheet(14/70 Pages) RENESAS

14 / 70 page

MITSUBISHI MICROCOMPUTERS

38B5 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PRELIMINAR

Notice:

This

is not

a final

specification.

Some

parametric

limits

are

subject

to change.

Fig. 9 Port Block Diagram (1)

(2) Ports P1, P3

(3) Port P20

(5) Port P43

(6) Port P44

(8) Port P47

(7) Ports P45, P46

INT2 interrupt

input

* High-breakdown-voltage P-channel transistor

Notes 1: The dimmer signal sets the Toff timing.

2: A pull-down resistor is not built in to ports P2 and P8.

VEE

Timer 1 output bit

Timer 3 output bit

Timer 1 output

Timer 3 output

Dimmer signal (Note 1)

read

Buzzer control signal

Buzzer signal output

Timer 6 output selection bit

Timer 6 output

INT0

,INT1,INT3 interrupt input

CNTR1 input

Timer 4 external clock input

(1) Ports P0, P21–P27, P80–P83

Data bus

Local data

bus

Port latch

Dimmer signal (Note 1)

FLD/Port

switch register

Direction register

read

VEE

(Note 2)

VEE

FLD/Port

switch register

Port latch

Direction register

Data bus

Local data

bus

(Note 2)

Data bus

Local data

bus

Port latch

Dimmer signal (Note 1)

(4) Ports P40–P42, P60

Port latch

Direction register

Data bus

Buzzer control signal

Buzzer signal output

Port latch

Direction register

Data bus

Port latch

Direction register

Data bus

Port latch

Direction register

Data bus

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