Renesas R8C/15 Technical Information Seite 180

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Seitenansicht 179
R8C/14 Group, R8C/15 Group 15. Clock Synchronous Serial I/O with Chip Select (SSU)
Rev.2.10 Jan 19, 2006 Page 166 of 253
REJ09B0164-0210
Figure 15.19 Example of Operation in Data Receive (4-Wire Bus Communication Mode)
SSCK
b0SSI
• When CPHS bit=0 (data download at even edges) and CPOS bit=0 (“H” when clock stops)
b7
SCS
(Output)
SSCK
• When CPHS bit=1 (data download at odd edges) and CPOS bit=0 (“H” when clock stops)
CPHS and CPOS : Bit in SSMR register
1 Frame
RDRF Bit in
SSSR Register
“0”
“1”
RSSTP Bit in
SSCRH Register
“0”
“1”
Dummy read in
SSRDR register
Process by
Program
1 Frame
High-Impedance
b0b7
High-Impedance
SCS
(Output)
b7 b0
Data read in SSRDR
register
RXI interrupt request
is generated
RXI interrupt request
is generated
Data read in SSRDR
register
RXI interrupt request
is generated
b0b7b0b7
b7
b0SSI
1 Frame
RDRF Bit in
SSSR Register
“0”
“1”
RSSTP Bit in
SSCRH Register
“0”
“1”
Dummy read in
SSRDR register
Process by
Program
1 Frame
Data read in SSRDR
register
RXI interrupt request
is generated
RXI interrupt request
is generated
RXI interrupt request
is generated
Set RSSTP
bit to “1”
Data read in SSRDR
register
Set RSSTP
bit to “1”
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