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M37640E8FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

Ver 1.4

MITSUBISHI MICROCOMPUTERS

7640 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

1.18 SERIAL I/O

The Serial I/O has the following main features:

• Synchronous transmission or reception

• Handshaking via SRDY output signal

• 8-bit character length

• Interrupt after transmission or reception

• Internal Clock

(When serial I/O synchronous clock select bit is “1”,

internal clock source divided by 2, 4, 8, 16, 32, 64,

128, 256 can be selected). If bit 1 of SIO Control Reg

ister 2 is “0”, internal clock source = .; if bit 1 of SIO

Control Register 2 is “1”, internal clock source =

SCSGCLK.)

• External Clock

(When SIO synchronous clock select bit is “1”, an

external clock input from the SCLK pin is selected).

•An SPI compatible mode in which the TxD and RxD

pins function as MOSI and MISO pins, respectively.

•Four (SPI compatible) clock phase and polarity options.

A block diagram of the clock synchronous SIO is shown

in Figure 1.36.

SRXD

STXD

SCLK

SRDY

Φ SCSGCLK

01

SPI

Slave

1

0

P83 Latch

1

0

P81 Latch

Selected

SPI

Slave

SPI Slave

10

P80 Latch

SRDY

0

1

CPol

CPha

0

1

Divider

SPI

SCSel

SIO Interrupt Request

Fig. 1.36. Clock Synchronous SIO Block Diagram

Data Bus

37

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