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(a) Serial operating mode register 20 (CSIM20)
CSIM20 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM20 to 00H.
Set 00H to CSIM20 when UART mode is selected.
Symbol
<7>
6
5
CSIM20
CSIE20 SSE20
0
CSIE20
0
Operation disabled
1
Operation enabled
SSE20
SS20-pin selection
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 pulse 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 fixed to 0.
CHAPTER 13 SERIAL INTERFACE 20
4
3
2
1
0
0
DAP20 DIR20 CSCK20 CKP20
3-wire serial I/O mode operation control
Function of the SS20/P23 pin
Port function
3-wire serial I/O mode data phase selection
First-bit specification
3-wire serial I/O mode clock selection
3-wire serial I/O mode clock phase selection
User's Manual U13045EJ2V0UM00
Address
After reset
FF72H
00H
Communication status
Communication enabled
0
Communication enabled
Communication disabled
1
R/W
R/W
177
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