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(a) Serial operation mode register 20 (CSIM20)
CSIM20 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM20 to 00H.
Set CSIM20 to 00H when UART mode is selected.
Symbol
<7>
6
CSIM20
CSIE20 SSE20
CSIE20
0
Operation disabled
1
Operation enabled
SSE20
0
Not used
1
Used
DAP20
0
Outputs at the falling edge of SCK20
1
Outputs at the rising edge of SCK20
DIR20
0
MSB
1
LSB
CSCK20
0
External clock input to the SCK20 pin
1
Output of the dedicated baud rate generator
CKP20
0
Clock is low active, and SCK20 is high level in the idle state
1
Clock is high active, and SCK20 is low level in the idle state
Caution Bits 4 and 5 must be set to 0.
228
CHAPTER 12 SERIAL INTERFACE 20
5
4
3
2
0
0
DAP20 DIR20 CSCK20 CKP20
3-wire serial I/O mode operation control
Function of SS20/P22 pin
SS20 pin selection
Port function
3-wire serial I/O mode data phase selection
3-wire serial I/O mode clock selection
3-wire serial I/O mode clock phase selection
User's Manual U15075EJ2V1UD
1
0
Address
After reset
FF72H
Communication enabled
0
Communication enabled
Communication disabled
1
First-bit specification
R/W
00H
R/W
Communication status
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