R8CSLASH15 datasheet(165/277 Pages) RENESAS

165 / 277 page

R8C/14 Group, R8C/15 Group

15. Clock Synchronous Serial I/O with Chip Select (SSU)

Rev.2.10

Jan 19, 2006

Page 153 of 253

REJ09B0164-0210

15.4

Communication Modes and Pin Functions

SSU switches functions of the I/O pin in each communication mode according to the setting of the

MSS bit in the SSCRH register and the RE and TE bits in the SSER register. Table 15.3 shows the

Association between Communication Modes and I/O Pins.

NOTES:

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

2. Do not set both the TE and RE bits 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 15.3

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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