R8CSLASH20 datasheet(298/501 Pages) RENESAS

298 / 501 page

R8C/20 Group, R8C/21 Group

16. Clock Synchronous Serial Interface

Rev.2.00 Aug 27, 2008

Page 282 of 458

REJ09B0250-0200

16. Clock Synchronous Serial Interface

The clock synchronous serial interface is configured as follows.

Clock Synchronous Serial Interface

The clock synchronous serial interface uses the registers of addresses 00B8h to 00BFh. Registers, bits, symbols and

functions vary even in the same addresses depending on the modes. Refer to registers of each function for details.

Also, the differences between clock synchronous communication mode and clock synchronous serial mode are the

options of the transfer clock, clock output format and data output format.

16.1

Mode Selection

The clock synchronous serial interface contains 4 modes.

Table 16.1 lists the Mode Selections. Refer to 16.2 Clock Synchronous Serial I/O with Chip Select (SSU) or after

for details of each mode.

Clock synchronous serial I/O with chip select (SSU)

Clock synchronous communication mode

4-wire bus communication mode

I2C bus interface

I2C bus interface mode

Clock synchronous serial mode

Table 16.1

Mode Selections

IICSEL Bit

in PMR

Bit 7 in 00B8h

(ICE Bit in ICCR1

Bit 0 in 00BDh

(SSUMS Bit in SSMR2

Function

Mode

Clock synchronous

serial I/O with chip

select

Clock synchronous

communication mode

4-wire bus communication

mode

I2C bus interface

I2C bus interface mode

Clock synchronous serial

mode

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