參數(shù)資料
型號: μPD789407
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(shù): 70/128頁
文件大?。?/td> 607K
代理商: ΜPD789407
70
μ
PD789405, 789406, 789407
(3) Asynchronous serial interface status register (ASIS)
The ASIS is used to display the type of a reception error, if it occurs while asynchronous serial interface mode is
set.
The ASIS is set using an 8-bit memory manipulation instruction.
The contents of the ASIS are undefined in three-wire serial I/O mode.
A RESET input clears the ASIS to 00H.
Figure 5-34. Asynchronous Serial Interface Status Register Format
PE
0
1
Parity error flag
0
0
0
0
0
PE
FE
OVE
ASIS
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).
FE
0
1
Framing error flag
No framing error has occurred.
A framing error has occurred (no stop bit detected).
Note 1
OVE
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 reception sequence was
completed.)
Notes 1.
Even if 2 is specified for the number of stop bits (using bit 2 (SL) of the ASIM), only one stop bit is
detected at reception.
After an overrun occurs, read-access the reception buffer register (RXB). Otherwise, the overrun
error will recur each time data is received.
2.
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