NEC PD78081(A) User Manual page 187

(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
ASIM TXE RXE PS1
164
CHAPTER 11 SERIAL INTERFACE CHANNEL 2
5 4 3 2
PS0 CL SL ISRM SCK
1 0 Address After Reset
FF70H
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 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
0 0
0 1
1 0
1
1
RXE Receive Operation Control
0 Receive operation stopped
1 Receive operation enabled
TXE Transmit Operation Control
0 Transmit operation stopped
1 Transmit operation enabled
R/W
00H R/W
Parity Bit Specification
No Parity
0 parity always added in transmission
No parity test in reception (parity error not
generated)
Odd parity
Even parity