NEC mPD789026 Subseries User Manual page 146

(b) Asynchronous serial interface mode register 00 (ASIM00)
ASIM00 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears ASIM00 to 00H.
When the 3-wire serial I/O mode is selected, 00H must be set to ASIM00.
Symbol <7> <6>
ASIM00 TXE00 RXE00
TXE00
0 Transmit operation stop
1 Transmit operation enable
RXE00
0 Receive operation stop
1 Receive operation enable
PS001 PS000
0 0
0 1
1 0
1 1
CL00
0
7 bits
1 8 bits
SL00
0 1 bit
1 2 bits
Cautions 1. Be sure to set bits 0 and 1 to 0.
2. Switching operating modes must be performed after serial transmit/receive
146
CHAPTER 9 SERIAL INTERFACE 00
5 4 3
PS001 PS000 CL00
Transmit Operation Control
Receive Operation Control
No parity
Always add 0 parity at transmission
Parity check is not performed at reception (No parity error is generated)
Odd parity
Even parity
Character Length Specification
Transmit Data Stop Bit Length Specification
operation is halted.
User's Manual U11919EJ3V0UM00
2 1 0
SL00 0 0
Parity Bit Specification
Address After Reset R/W
FF70H 00H R/W