ml670100 Oki Semiconductor, ml670100 Datasheet - Page 121

• Manufacturer Part Number: ml670100
• Description: Ml670100 Is A High-performance 32-bit Microcontroller
• Manufacturer: Oki Semiconductor

8.2.4
The ASI Status Register (ASIST) is an 8-bit read/write register containing transmit/ receive
ready flags and error flags for errors detected during receive operations.
The interface updates the lowest three bits upon completion of each receive operation, setting
the flags to "1" whenever it detects the corresponding errors in the input.
Note, however, that it does not clear a flag if a subsequent character is free of that error. It is up
to the program to clear these flags.
The same applies to the transmit/receive ready flags.
To clear a flag, write "1" to it. Writing "0" produces no change.
After a system reset, this register contains 0x00.
ASI Status Register (ASIST)
7
0
6
0
ATRIRQ
A “0” indicates a reserved bit. Always write “0” to it.
Writing “1” produces unreliable operation.
5
Figure 8.5 : ASI Status Register (ASIST)
ARVIRQ
4
3
0
PERR
2
OERR
1
FERR
0
0 Framing error: no error
1 Framing error: error
0 Overrun error: no error
1 Overrun error: error
0 Parity error: no error
1 Parity error: error
0 Receive ready flag: not ready
1 Receive ready flag: ready
0 Transmit ready flag: not
1 Transmit ready flag: ready
ready
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