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M37641F8

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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MITSUBISHI MICROCOMPUTERS

7641 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

SCSGCLK

φ

P80/UTXD2/SRDY

P81/URXD2/SCLK

P83/RTS2/STXD

P82/CTS2/SRXD

Serial I/O internal

“1” clock select bit

“0”

Synchronous

clock select bit

“0”

P80 latch

“1”

SRDY output select bit

Synchronization

circuit

1/2

1/4

1/8

1/16

1/32

1/64

1/128

“1”

1/256

Data bus

Internal synchronous

“0”

clock selection bits

External clock

“0”

P81 latch

“1”

Serial I/O port select bit

Serial I/O counter (3)

SPI mode select bit

“0”

P83 latch

“1” Serial I/O port select bit

“1”

“0” SRXD input enable bit

Serial I/O shift register (8)

Serial I/O

interrupt request

Fig. 24 Block diagram of serial I/O

29

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