MB90F474LPF datasheet(37/118 Pages) FUJITSU

37 / 118 page

MB90470 Series

Expanded I/O Serial Interface

The expended I/O serial interface is a serial I/O interface in 8-bit

× 1 channel configuration allowing clock

synchronized data transmission.

The interface has two serial I/O operating modes.

• Internal shift clock mode : Data transfer is synchronized with an internal clock.

• External shift clock mode : Data transfer is synchronized with a clock input from an external pin (SCK) .

This mode allows the external clock pin (SCK) to be shared with a general

purpose port that can transfer data according to CPU instructions.

(1) Register List

Serial mode control status register (SMCS)

Serial data register (SDR)

Communication prescaler control register (SDCR0, SDCR1)

Initial value

Address :

000027H

00002BH

0 0 0 0 0 0 1 0B

Initial value

Address :

000026H

00002AH

- - - - 0 0 0 0B

Initial value

Address :

000028H

00002CH

XXXXXXXXB

Initial value

Address :

000029H

00002DH

0 - - - 0000B

SMD1

SMD2

SMD0

SIE

SIR

BUSY

STOP

STRT

(R/W)







MODE

BDS

SOE

SCOE

(R/W)

(

)

(

)

(

)

(

)

(R/W)

(

 )(  )(  )

(R/W)



(R/W)



DIV3

DIV2

DIV1

DIV0

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