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Asynchronous serial interface mode register 20 (ASIM20)
ASIM20 is used to make the settings related to asynchronous serial interface mode.
ASIM20 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ASIM20 to 00H.
Figure 11-4. Format of Asynchronous Serial Interface Mode Register 20
Symbol
<7>
<6>
5
ASIM20
TXE20 RXE20 PS201 PS200 CL20
TXE20
0
Transmit operation stopped
1
Transmit operation enabled
RXE20
0
Receive operation stopped
1
Receive operation enabled
PS201
PS200
0
0
No parity
0
1
Always add 0 parity at transmission.
Parity check is not performed at reception (no parity error is generated).
1
0
Odd parity
1
1
Even parity
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. If 3-wire serial I/O mode is selected, ASIM20 must be set to 00H.
3. Switch operation modes after halting the serial transmission/reception operation.
CHAPTER 11 SERIAL INTERFACE 20
4
3
2
1
0
SL20
0
0
Transmit operation control
Receive operation control
Parity bit specification
Transmit data character length specification
Transmit data stop bit length
User's Manual U15331EJ4V1UD
Address
After reset
R/W
FF70H
00H
R/W
191
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