
R8C/14 Group, R8C/15 Group 15. Clock Synchronous Serial I/O with Chip Select (SSU)
Rev.2.10 Jan 19, 2006 Page 164 of 253
REJ09B0164-0210
Figure 15.18 Example of Operation in Data Transmit (4-Wire Bus Communication Mode)
TDRE Bit in
SSSR Register
“0”
“1”
TEND Bit in
SSSR Register
“0”
“1”
Data write to SSTDR register
Process by
Program
SSCK
b0SSO
• When CPHS bit=0 (data change at even edges), CPOS bit=0 (“H” when clock stops)
b7
SCS
(Output)
SSCK
• When CPHS bit=1 (data change at even edges), CPOS bit=0 (“H” when clock stops)
CPHS, CPOS : Bits in SSMR register
1 Frame
TDRE Bit in
SSSR Register
“0”
“1”
TEND Bit in
SSSR Register
“0”
“1”
Data write to SSTDR register
Process by
Program
1 Frame
High-Impedance
b0b7
High-Impedance
SCS
(Output)
TXI interrupt request is
generated
b7
b0SSO
1 Frame 1 Frame
b6 b6
TXI interrupt request is
generated
TEI interrupt request is
generated
b6 b7
b0b6
TEI interrupt request is
generated
TXI interrupt request is
generated
TXI interrupt request is
generated
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