Renesas R8C series User Manual

R8C/1A Group, R8C/1B Group 20. Usage Notes
Rev.1.30 Dec 08, 2006 Page 303 of 315
REJ09B0252-0130
20.5 Precautions on Clock Synchronous Serial Interface
20.5.1 Notes on Clock Synchronous Serial I/O with Chip Select
Set the IICSEL bit in the PMR register to 0 (select clock synchronous serial I/O with chip select function) to use
the clock synchronous serial I/O with chip select function.
20.5.1.1 Accessing Registers Associated with Clock Synchronous Serial I/O
with Chip Select
After waiting three instructions or more after writing to the registers associated with clock synchronous serial I/
O with chip select (00B8h to 00BFh) or four cycles or more after writing to them, read the registers.
• An example of waiting three instructions or more
Program example MOV.B #00h,00BBh ; Set the SSER register to 00h.
NOP
NOP
NOP
MOV.B 00BBh,R0L
• An example of waiting four cycles or more
Program example BCLR 4,00BBh : Disable transmission
JMP.B NEXT
NEXT:
BSET 3,00BBh : Enable reception
20.5.1.2 Selecting SSI Signal Pin
Set the SOOS bit in the SSMR2 register to 0 (CMOS output) in the following settings:
• SSUMS bit in SSMR2 register = 1 (4-wire bus communication mode)
• BIDE bit in SSMR2 register = 0 (standard mode)
• MSS bit in SSCRH register = 0 (operate as slave device)
• SSISEL bit in PMR register = 1 (use P1_6 pin for SSI01 pin)
Do not use the SSI01 pin with NMOS open drain output for the above settings.

Renesas R8C series Specifications

General

Brand	Renesas
Model	R8C series
Category	Computer Hardware
Language	English