7641 datasheet(176/385 Pages) RENESAS

176 / 385 page

Rev.2.00

Aug 28, 2006

page 45 of 148

7641 Group

REJ09B0336-0200

APPLICATION

2.3 Serial I/O

Figure 2.3.11 shows the registers setting for the transmitter, and Figure 2.3.12 shows a setting of

serial I/O transmission data.

Fig. 2.3.11 Registers setting for transmitter

Fig. 2.3.12 Setting of serial I/O transmission data

SRDY output selected

STXD, SCLK output selected

Serial I/O interrupt : Disabled

ICONC

Interrupt control register C (Address : 0716)

Set P31 output level to “H”.

Port P3 (Address : 0E16)

SIOCON1

Serial I/O control register 1 (Address : 2B16)

Internal synchronous clock : Internal clock/32

LSB first

Synchronous clock : Internal clock

b7b0

STXD pin : CMOS output

Normal serial I/O mode

b7b0

Serial I/O control register 2 (Address : 2C16)

SIOCON2

Serial I/O internal clock :

SRXD input enabled

Set P31 to output mode.

P3D

Port P3 direction register (Address : 0F16)

b7b0

Set a transmission data.

Confirm that transmission of the previous data is

completed (Serial I/O interrupt request bit is “1”)

before writing data.

SIOSHT

Serial I/O shift register (Address : 2A16)

b7b0

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