Renesas R8C/15 Información técnica Pagina 164

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R8C/14 Group, R8C/15 Group 15. Clock Synchronous Serial I/O with Chip Select (SSU)
Rev.2.10 Jan 19, 2006 Page 150 of 253
REJ09B0164-0210
Figure 15.9 Association between Transfer Clock Polarity, Phase and Transfer Data
SSCK
b0
SSO, SSI
When SSUMS=0 (clock synchronous communication mode), CPHS bit=0 (data change at
odd edge) and CPOS bit=0 (“H” when clock stops)
b1 b2 b3 b4 b5 b6 b7
SSCK
CPOS=0
(“H” when clock stops)
b0SSO, SSI
When SSUMS=1 (4-wire bus communication mode) and CPHS=0 (data change at odd edge)
b1 b2 b3 b4 b5 b6 b7
SSCK
CPOS=1
(“L” when clock stops)
SCS
SSCK
CPOS=0
(“H” when clock stops)
SSO, SSI
When SSUMS=1 (4-wire bus communication mode), CPHS=1 (data download at odd edge)
SSCK
CPOS=1
(“L” when clock stops)
SCS
b0 b1 b2
b3 b4
b5
b6
b7
CPHS and CPOS : bits in SSMR register, SSUMS : Bits in SSMR2 register
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