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(b) Asynchronous serial interface status register (ASIS)
ASIS is read with an 8-bit memory manipulation instruction.
RESET input clears ASIS to 00H.
Address: FF86H After Reset: 00H
Symbol
7
ASIS
0
PE
0
No parity error
1
Parity error
(Transmit data parity does not match)
FE
0
No framing error
1
Framing error
(Stop bit not detected)
OVE
0
No overrun error
1
Overrun error
(Next receive operation was completed before data was read from receive buffer register)
Notes 1. Even if a stop bit length of two bits has been set to bit 2 (SL) in the asynchronous serial interface
mode register (ASIM), stop bit detection during a receive operation only applies to a stop bit
length of 1 bit.
2. Be sure to read the contents of the receive buffer register (RXB) when an overrun error has
occurred.
Until the contents of RXB are read, further overrun errors will occur when receiving data.
CHAPTER 13 SERIAL INTERFACE UART
R
6
5
4
0
0
0
Note 1
Note 2
Preliminary User's Manual U14581EJ3V0UM00
3
2
0
PE
Parity Error Flag
Framing Error Flag
Overrun Error Flag
1
0
FE
OVE
177
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