R8C/1A Group, R8C/1B Group
16. Clock Synchronous Serial Interface
Rev.1.30
Dec 08, 2006
Page 169 of 315
REJ09B0252-0130
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 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.
Clock synchronous serial I/O with chip select (SSU)
Clock synchronous communication mode
4-wire bus communication mode
I
2
C bus Interface
I
2
C bus interface mode
Clock synchronous serial mode
Table 16.1
Mode Selection
IICSEL Bit in
PMR Register
Bit 7 in 00B8h
(ICE Bit in
ICCR1 Register)
Bit 0 in 00BDh
(SSUMS Bit in SSMR2
Register, FS Bit in SAR
Register)
Function
Mode
0
0
0
Clock synchronous
serial I/O with chip
select
Clock synchronous
communication mode
0
0
1
4-wire bus communication mode
1
1
0
I
2
C bus interface
I
2
C bus interface mode
1
1
1
Clock synchronous serial mode
