NEC PD78052 User Manual page 468

(b) Asynchronous serial interface mode register (ASIM)
ASIM is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ASIM to 00H.
When the 3-wire serial I/O mode is selected, 00H should be set in ASIM.
Symbol
<7> <6> 5
ASIM TXE RXE PS1
468
CHAPTER 19 SERIAL INTERFACE CHANNEL 2
4 3 2 1 0
PS0 CL SL ISRM SCK
Address After Reset R/W
FF70H 00H R/W
SCK Clock Selection in Asynchronous Serial Interface
Mode
0 Input clock from off-chip to ASCK pin
1 Dedicated baud rate generator output
ISRM Control of Reception Completion Interrupt Request
in Case of Error Generation
Reception completion interrupt request generated
0
in case of error generation
Reception completion interrupt request not
1
generated in case of error generation
SL Transmit Data Stop Bit Length Specification
0 1 bit
1 2 bits
CL Character Length Specification
0 7 bits
1 8 bits
PS1 PS0 Parity Bit Specification
0
0 No Parity
0 parity always added in transmission
0 1 No parity test in reception (parity error not
generated)
1 0 Odd parity
1 1 Even parity
RXE Receive Operation Control
0 Receive operation stopped
1 Receive operation enabled
TXE Transmit Operation Control
0 Transmit operation stopped
1 Transmit operation enabled