NEC mPD789026 Subseries User Manual page 128

(3) Asynchronous serial interface status register 00 (ASIS00)
This register indicates types of error when a reception error is generated in the asynchronous interface
mode.
ASIS00 is set with a 1-bit or 8-bit memory manipulation instruction.
The contents of ASIS00 become undefined in the 3-wire serial I/O mode.
RESET input clears ASIS00 to 00H.
Figure 9-5. Asynchronous Serial Interface Status Register 00 Format
Symbol 7 6
ASIS00 0 0
PE00
0 Parity error not generated
1 Parity error generated (when the parity of transmit data does not coincide.)
FE00
0
Flaming error not generated
1 Flaming error generated (when stop bit is not detected.)
OVE00
0 Overrun error not generated
1 Overrun error generated
(when the next receive operation is completed before the data is read from the receive buffer register.)
Notes 1. Even when the stop bit length is set to 2 bits by setting bit 2 (SL00) of asynchronous serial
interface mode register 00 (ASIM00), the stop bit detection in the case of reception is performed
with 1 bit.
2. When an overrun error occurs, be sure to read out receive buffer register 00 (RXB00). Unless
RXB00 is read out, overrun errors occur at each data reception.
128
CHAPTER 9 SERIAL INTERFACE 00
5 4 3
0 0 0 PE00
Flaming Error Flag
Overrun Error Flag
Note 2
User's Manual U11919EJ3V0UM00
2 1 0 Address
FE00 OVE00 FF71H
Parity Error Flag
Note 1
After Reset R/W
00H R