
R8C/14 Group, R8C/15 Group 15. Clock Synchronous Serial I/O with Chip Select (SSU)
Rev.2.10 Jan 19, 2006 Page 154 of 253
REJ09B0164-0210
15.5 Clock Synchronous Communication Mode
15.5.1 Initialization in Clock Synchronous Communication Mode
Figure 15.11 shows an Initialization in Clock Synchronous Communication Mode. Set the TE bit in the
SSER register to “0” (disables transmit) and the RE bit to “0” (disables receive) before data transmit /
receive as an initialization.
When communication mode and format are changed, set the TE bit to “0” and the RE bit to “0” before
changing.
Setting the RE bit to “0” does not change the contents of the RDRF and ORER flags, and the contents
of the SSRDR register.
Figure 15.11 Initialization in Clock Synchronous Communication Mode
Start
SSMR2 register SSUMS bit ← 0
SSCRH register Set CKS0 to CKS2 bits
Set RSSTP bit
SSSR register ORER bit ← 0
(1)
SSER register RE bit ← 1 (When receive)
TE bit ← 1 (When transmit)
Set RIE, TEIE and TIE bits
End
NOTES:
1. Write “0” after reading “1” to set the ORER bit to “0”.
SSER register RE bit ← 0
TE bit ← 0
SSMR2 register SCKS bit ← 1
Set SOOS bit
SSCRH register Set MSS bit
SSMR register CPHS bit ← 0
CPOS bit ← 0
Set MLS bit
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