CHAPTER 13 SERIAL INTERFACE 20
User’s Manual U13045EJ2V0UM00
179
(c) Asynchronous serial interface status register 20 (ASIS20)
ASIS20 is read with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears ASIS20 to 00H.
Notes
1. Even when the stop bit length is set to 2 bits by setting bit 2 (SL20) of asynchronous serial interface
mode register 20 (ASIM20), the stop bit detection in the case of reception is performed with 1 bit.
2. Be sure to read receive buffer register 20 (RXB20) when an overrun error occurs. If not, every
time the data is received an overrun error is generated.
PE20
0
1
Parity error flag
0
0
0
0
0
PE20 FE20 OVE20
ASIS20
Symbol
Address
After reset
R/W
FF71H
00H
R
7
6
5
4
3
2
1
0
Parity error not generated
Parity error generated (when the parity of transmit data does not match.)
Framing error not generated
Framing error generated (when stop bit is not detected.)
Note 1
Overrun error not generated
Overrun error generated
Note 2
(when the next receive operation is completed before the data is read from the receive buffer register.)
FE20
0
1
0
1
Flaming error flag
Overrun error flag
OVE20
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