R8C1A Datasheet, PDF (200/339 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER R8C FAMILY / R8C/1x SERIES

R8C/1A Group, R8C/1B Group
16. Clock Synchronous Serial Interface
16.2.5 Clock Synchronous Communication Mode
16.2.5.1 Initialization in Clock Synchronous Communication Mode
Figure 16.12 shows Initialization in Clock Synchronous Communication Mode. To initialize, set the TE bit in
the SSER register to 0 (transmit disabled) and the RE bit to 0 (receive disabled) before data transmission or
reception.
Set the TE bit to 0 and the RE bit to 0 before changing the communication mode or format.
Setting the RE bit to 0 does not change the contents of flags RDRF and ORER and the contents of the SSRDR
register.
Start
SSER register RE bit ← 0
TE bit ← 0
SSMR2 register SSUMS bit ← 0
SSMR register
CPHS bit ← 0
CPOS bit ← 0
Set MLS bit
SSCRH register Set MSS bit
SSMR2 register SCKS bit ← 1
Set SOOS bit
SSCRH register Set bits CKS0 to CKS2
Set RSSTP bit
SSSR register ORER bit ← 0⁽¹⁾
SSER register
RE bit ← 1 (receive)
TE bit ← 1 (transmit)
Set bits RIE, TEIE, and TIE
End
NOTE:
1. Write 0 after reading 1 to set the ORER bit to 0.
Figure 16.12 Initialization in Clock Synchronous Communication Mode
Rev.1.30 Dec 08, 2006 Page 184 of 315
REJ09B0252-0130