CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
357
(b) Clock phase selection
The following shows the timing when changing the conditions for clock phase selection (CKPn bit of
CSICn register) and data phase selection (DAPn bit of CSICn register) under the following conditions.
•
Data length = 8 bits (CCLn bit of CSIMn register = 0)
•
First bit of transfer data = MSB (DIRn bit of CSIMn register = 0)
•
No interrupt request signal delay control (CSITn bit of CSIMn register = 0)
Figure 11-14. Timing Chart According to Clock Phase Selection (1/2)
(a) When CKPn bit = 0, DAPn bit = 0
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DO7 DO6 DO5 DO4 DO3 DO2 DO1
SCKn (I/O)
SIn (input)
SOn (output)
Reg_R/W
INTCSIn interrupt
CSOTn bit
DI0
DO0
(b)
When CKPn bit = 1, DAPn bit = 0
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DO7 DO6 DO5 DO4 DO3 DO2 DO1
SCKn (I/O)
SIn (input)
SOn (output)
Reg_R/W
INTCSIn interrupt
CSOTn bit
DI0
DO0
Remarks 1.
n = 5, 6
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.