7540 datasheet(197/366 Pages) RENESAS

197 / 366 page

2-121

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

APPLICATION

2.7 Serial I/O2

Fig. 2.7.3 Structure of Serial I/O2 control register

Fig. 2.7.4 Structure of Serial I/O2 register

b7b6b5b4b3 b2b1b0

Function

At reset

Name

Serial I/O2 control register (SIO2CON) [Address : 3016]

Nothing is allocated for this bit. This is a write disabled bit.

When this bit is read out, the value is “0”.

Serial I/O2 control register

Note: When using it as a SDATA input, set the port P13 direction register bit to “0”.

0 : LSB first

1 : MSB first

0 0 0 : f(XIN)/8

0 0 1 : f(XIN)/16

0 1 0 : f(XIN)/32

0 1 1 : f(XIN)/64

1 1 0 : f(XIN)/128

1 1 1 : f(XIN)/256

Internal synchronous

clock selection bits

Transfer direction selection bit

b2 b1 b0

SDATA2 pin selection bit

(Note)

0 : I/O port / SDATA2 input

1 : SDATA2 output

SCLK2 pin selection bit

0 : External clock (SCLK2 is input)

1 : Internal clock (SCLK2 is output)

Transmit / receive shift

completion flag

0 : shift in progress

1 : shift completed

Serial I/O2 register

b7 b6 b5 b4 b3 b2 b1 b0

Function

At reset

Serial I/O2 register (SIO2) [Address : 31 16]

A shift register for serial transmission and reception.

• At transmitting : Set a transmission data.

• At receiving : A reception data is stored.

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