38C3 datasheet(25/63 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

Data bus

XCIN

XIN

Serial I/O

interrupt request

P46 latch

P45 latch

Serial I/O port selection bit

P47 latch

Serial I/O counter (3)

Serial I/O shift register (8)

Synchronous

circuit

Internal

system clock

selection bit

Serial I/O port selection bit

“1”

“0”

SRDY output selection bit

External clock

Synchronous clock

selection bit

1/8

1/16

1/32

1/64

1/128

1/256

Internal synchronous

clock selection bits

P46/SCLK1

P45/SOUT

P44/SIN

SRDY

P47/SRDY

P40 latch

Serial I/O port selection bit

P40/SCLK2

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

SERIAL I/O

The 38C3 group has a built-in 8-bit clock synchronous serial I/O. The

I/O pins of serial I/O also operate as I/O port P4, and their function is

selected by the serial I/O control register 1 (address 001916).

Fig. 22 Block diagram of serial I/O

38C3 Datasheet(PDF) 25 Page - Renesas Technology Corp

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