CHAPTER 12 SERIAL INTERFACE 20
User’s Manual U15075EJ2V1UD
230
(c) Asynchronous serial interface status register 20 (ASIS20)
ASIS20 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets ASIS20 to 00H.
PE20
0
1
Parity error flag
No parity error has occurred
A parity error has occurred (when the transmit parity and receive parity did not match)
No framing error has occurred
A framing error has occurred (when stop bit is not detected)
Note 1
No overrun error has occurred
An overrun error has occurred
Note 2
(when the next receive operation is completed before data is read from reception buffer register 20)
FE20
0
1
0
1
Framing error flag
Overrun error flag
OVE20
0
0
0
0
0
PE20
FE20
OVE20
ASIS20
7
6
5
4
Symbol
Address
After reset
R/W
FF71H
00H
R
3
<2>
<1>
<0>
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 at reception is performed with 1
bit.
2.
Be sure to read reception buffer register 20 (RXB20) when an overrun error occurs. If not,
every time the data is received an overrun error will occur.