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CHAPTER 13 SERIAL INTERFACE (UART0)
Preliminary User’s Manual U16035EJ1V0UM
(b) Asynchronous serial interface status register 0 (ASIS0)
ASIS0 can be read by an 8-bit memory manipulation instruction.
RESET input sets ASIS0 to 00H.
Address: FFA1H After reset: 00H R
Symbol
7
6
5
4
3
2
1
0
ASIS0
0
0
0
0
0
PE0
FE0
OVE0
PE0
Parity error flag
0
No parity error
1
Parity error
(Transmit data parity not matched)
FE0
Framing error flag
0
No framing error
1
Framing error
Note 1
(Stop bit not detected)
OVE0
Overrun error flag
0
No overrun error
1
Overrun error
Note 2
(Next receive operation was completed before data was read from receive buffer register
0 (RXB0))
Notes 1.
Even if a stop bit length is set to 2 bits by setting bit 2 (SL0) in the asynchronous serial interface
mode register 0 (ASIM0), 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 0 (RXB0) when an overrun error has
occurred.
Until the contents of RXB0 are read, further overrun errors will occur when receiving data.
