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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(b) Clock phase selection
The following shows the timing when changing the conditions for clock phase selection (CKP bit of
CSICn register) and data phase selection (DAP bit of CSICn register) under the following
conditions.
• Data length = 8 bits (CCL bit of CSIMn register = 0)
• First bit of transfer data = MSB (DIR bit of CSIMn register = 0)
• No interrupt request signal delay control (CSIT bit of CSIMn register = 0)
Figure 13-35:
Timing Chart According to Clock Phase Selection (1/2)
(a) When CKP bit = 0, DAP bit = 0
(b) When CKP bit = 1, DAP bit = 0
Remarks: 1. n = 0 to 2
2. Reg_R/W:Internal signal. This signal indicates that receive data buffer register (SIRBn/
SIRBLn) read or transmit data buffer register (SOTBn/SOTBLn) write was performed.
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DO7
DO6
DO5
DO4
DO3
DO2
DO1
SCK0n (input/output)
SI0n (input)
SO0n (output)
Reg_R/W
INTCSIn interrupt
CSOT bit
DI0
DO0
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DO7
DO6
DO5
DO4
DO3
DO2
DO1
SCK0n (input/output)
SI0n (input)
SO0n (output)
Reg_R/W
INTCSIn interrupt
CSOT bit
DI0
DO0
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