16. Clock Synchronous Serial Interface; Mode Selection - Renesas R8C Series User Manual

R8C/1A Group, R8C/1B Group

16. Clock Synchronous Serial Interface

The clock synchronous serial interface is configured as follows.
Clock synchronous serial interface
Clock synchronous serial I/O with chip select (SSU)
2
I C bus Interface
The clock synchronous serial interface uses the registers at addresses 00B8h to 00BFh. Registers, bits, symbols, and
functions vary even for the same addresses depending on the mode. Refer to the register diagrams 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 has four modes.
Table 16.1lists the Mode Selections. Refer to 16.2 Clock Synchronous Serial I/O with Chip Select (SSU) and the
sections that follow for details of each mode.
Table 16.1 Mode Selection
IICSEL Bit in Bit 7 in 00B8h
PMR Register
ICCR1 Register)
0 0
0 0
1 1
1 1
Rev.1.30 Dec 08, 2006
REJ09B0252-0130
Bit 0 in 00BDh
(ICE Bit in (SSUMS Bit in SSMR2
Register, FS Bit in SAR
Register)
0
1
0
1
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16. Clock Synchronous Serial Interface
Clock synchronous communication mode
4-wire bus communication mode
2
I C bus interface mode
Clock synchronous serial mode
Function
Clock synchronous Clock synchronous
serial I/O with chip communication mode
select
4-wire bus communication mode
2 2
I C bus interface I C bus interface mode
Clock synchronous serial mode
Mode