MB90F482BPF datasheet(39/124 Pages) FUJITSU

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MB90480B/485B Series

DS07-13722-11E

Expanded I/O Serial Interface

The expanded I/O serial interface is an 8-bit

× 1-channel serial I/O interface for clock synchronized data

transfer. A selection of LSB-first or MSB-first data transfer is provided.

There are two serial I/O operation modes.

(1) Register List

• Internal shift clock mode

: Data transfer is synchronized with the internal clock signal.

• External shift clock mode : Data transfer is synchronized with a clock signal input from the external clock

signal pin (SCK) . In this mode the general-purpose port that shares the external

clock signal pin (SCK) can be used for transfer according to CPU instructions.

Serial mode control status register 0/1 (SMCS0, SMCS1)

Serial data register 0/1 (SDR0, SDR1)

Communication prescaler control register 0/1 (SDCR0, SDCR1)

Initial value

Address : 000027H

00002BH

00000010B

Address : 000026H

00002AH

----0000B

Address : 000028H

00002CH

XXXXXXXXB

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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