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(b) Asynchronous serial interface mode register 20 (ASIM20)
ASIM20 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ASIM20 to 00H.
When 3-wire serial I/O mode is selected, ASIM20 must be set to 00H.
Symbol
<7>
<6>
ASIM20
TXE20
RXE20
TXE20
0
Transmit operation stopped
1
Transmit operation enabled
RXE20
0
Receive operation stopped
1
Receive operation enabled
PS201
PS200
0
0
0
1
1
0
1
1
CL20
0
7 bits
1
8 bits
SL20
0
1 bit
1
2 bits
Cautions 1. Bits 0 and 1 must be set to 0.
2. Switch operation modes after halting the serial transmission/reception operation.
212
CHAPTER 11 SERIAL INTERFACE 20
5
4
3
PS201
PS200
CL20
No parity
Always add 0 parity at transmission.
Parity check is not performed at reception (no parity error occurs).
Odd parity
Even parity
Transmit data character length specification
Transmit data stop bit length specification
User's Manual U15331EJ4V1UD
2
1
0
SL20
0
0
Transmit operation control
Receive operation control
Parity bit specification
Address
After reset
R/W
FF70H
00H
R/W
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