
MC80F0104/0204
Preliminary
74
Mar. 2005 Ver 0.2
Asynchronous serial interface status register (ASISR)
When a receive error occurs during UART mode, this reg-
ister indicates the type of error. ASISR can be read by an 8
bit memory manipulation instruction. The RESET input
sets ASISR to ----_-000B. Figure 16-4 shows the format
of ASISR..
Figure 16-4 Asynchronous Serial Interface Status Register (ASISR) Format
BTCL
7
6
5
4
3
2
1
0
-
-
FE
UART Frame Error Flag
INITIAL VALUE: ---- -000
B
ADDRESS: 0E7
H
ASISR
OVE
R
R
R
0: No Frame error
1: Framing error
Note1
(stop bit not detected)
UART Parity Error Flag
-
PE
-
-
UART Overrun Error Flag
0: No overrun error
1: Overrun error
Note2
0: No parity error
1: Parity error (Transmit data parity not matched)
Note 1. Even if a stop bit length is set to 2 bits by setting bit2(SL) in
ASIMR, stop bit detection during a recive operation only applies
to a stop bit length of 1bit.
2. Be sure to read the contents of the receive buffer register(RXR)
when an overrun error has occurred.
Until the contents of RXR are read, futher overrun errors will
occur when receiving data.
(Next receive operation was completed before data was read
from
receive buffer register (RXR))
Содержание MC80C0104
Страница 108: ...MC80F0104 0204 Preliminary 104 Mar 2005 Ver 0 2 25 Emulator EVA Board Setting...
Страница 115: ...APPENDIX...
Страница 116: ......
Страница 124: ...viii Mar 2005 Ver 0 2 MC80F0104 0204 Preliminary...