R8CSLASH20 datasheet(312/501 Pages) RENESAS

312 / 501 page

R8C/20 Group, R8C/21 Group

16. Clock Synchronous Serial Interface

Rev.2.00 Aug 27, 2008

Page 296 of 458

REJ09B0250-0200

16.2.4

Communication Modes and Pin Functions

Clock synchronous serial I/O with chip select 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 16.4 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 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

Input

−(1)

Input

−(1)

Output

Input

Output

Input

101

Input

−(1)

Output

−(1)

Output

Input

Output

4-Wire Bus

Communication Mode

001

−(1)

Input

Output

−(1)

Input

Output

Input

101

Input

−(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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