R8CSLASH29 datasheet(281/471 Pages) RENESAS

281 / 471 page

R8C/28 Group, R8C/29 Group

16. Clock Synchronous Serial Interface

Rev.2.10

Sep 26, 2008

Page 264 of 441

REJ09B0279-0210

16.2.4

Communication Modes and Pin Functions

Clock synchronous serial I/O with chip select switches the functions of the I/O pins in each communication

mode according to the setting of the MSS bit in the SSCRH register and bits RE and TE in the SSER register.

Table 16.4 shows the Association between Communication Modes and I/O Pins.

NOTES:

1. This pin can be used as a programmable I/O port.

2. Do not set both bits TE and RE to 1 in 4-wire bus (bidirectional) communication mode.

SSUMS and BIDE: Bits in SSMR2 register

MSS: Bit in SSCRH register

TE and RE: Bits in SSER register

Table 16.4

Association between Communication Modes and I/O Pins

Communication Mode

Bit Setting

Pin State

SSUMS

BIDE

MSS

SSI

SSO

SSCK

Clock synchronous

communication mode

Disabled

001Input

−(1)

Input

−(1)

Output

Input

Output

Input

101Input

−(1)

Output

−(1)

Output

Input

Output

4-wire bus

communication mode

001

−(1)

Input

Output

−(1)

Input

Output

Input

101Input

−(1)

Output

−(1)

Output

Input

Output

4-wire bus

(bidirectional)

communication mode(2)

001

−(1)

Input

−(1)

Output

Input

101

−(1)

Input

Output

−(1)

Output

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