參數資料
型號: μPD78F9197Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數: 71/150頁
文件大小: 636K
代理商: ΜPD78F9197Y
Preliminary Product Information
71
μ
PD78F9197Y
(c) Asynchronous serial interface status register 20 (ASIS20)
ASIS20 is used to display the type of a reception error, if it occurs while asynchronous serial interface
mode is set.
ASIS20 is manipulated using an 8-bit memory manipulation instruction.
The contents of ASIS20 are undefined in three-wire serial I/O mode.
A RESET input clears ASIS20 to 00H.
Figure 7-35. Format of Asynchronous Serial Interface Status Register 20
PE20
0
1
Parity error flag
0
0
0
0
0
PE20 FE20
OVE20
ASIS20
Symbol
Address
When reset
R/W
FF71H
00H
R
7
6
5
4
3
2
1
0
No parity error has occurred.
A parity error has occurred (parity mismatch in transmission data).
FE20
0
1
Framing error flag
No framing error has occurred.
A framing error has occurred (no stop bit detected).
Note 1
OVE20
0
1
Overrun error flag
No overrun error has occurred.
An overrun error has occurred
Note 2
(Before data was read from the reception buffer register, the subsequent recepiton sequence was
completed.)
Notes 1.
Even if 2 is specified for the number of stop bits (using bit 2 (SL20) of ASIM20), only one stop bit is
detected at reception.
2.
After an overrun occurs, read-access the reception buffer register 20 (RXB20). Otherwise, the overrun
error will recur each time data is received.
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