7643 datasheet(145/424 Pages) RENESAS

145 / 424 page

Rev.2.00

Aug 28, 2006

page 24 of 202

7643 Group

REJ09B0133-0200

APPLICATION

2.3 Serial I/O

2.3.2 Related registers

Fig. 2.3.2 Structure of Serial I/O shift register

Fig. 2.3.3 Structure of Serial I/O control register 1

Serial I/O shift register

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O shift register

(SIOSHT: address 2A16)

Undefined

Functions

At reset R W

Undefined

qAt transmitting

Writing transmitted data to this register starts transmitting operation.

qAt receiving

Read received data through this register.

Serial I/O control register 1

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O control register 1

(SIOCON1 : address 2B16)

Name

Functions

At reset R W

SRDY output select bit

Transfer direction select bit

Serial I/O port select bit

b2b1b0

0 0 0 :

φ/2

0 0 1 :

φ/4

0 1 0 :

φ/8

0 1 1 :

φ/16

1 0 0 :

φ/32

1 0 1 :

φ/64

1 1 0 :

φ/128

1 1 1 :

φ/256

0 : I/O port

1 : STXD, SCLK signal output

0 : I/O port

1 : SRDY signal output

Synchronous clock select

bit

STXD output channel

control bit

Internal synchronous clock

select bits

0 : LSB first

1 : MSB first

0 : External input (SCLK pin input)

1 : Internal synchronous clock

0 : CMOS output

1 : N-channel open drain output

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