參數(shù)資料
型號: μPD789186
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): 68/146頁
文件大?。?/td> 630K
代理商: ΜPD789186
Preliminary Product Information
68
μ
PD789186, 789187, 789196, 789197
(b) Asynchronous serial interface mode register 20 (ASIM20)
ASIM20 is used to make the settings related to asynchronous serial interface mode.
ASIM20 is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears ASIM20 to 00H.
Figure 6-34. Asynchronous Serial Interface Mode Register 20 Format
TXE20
0
1
Transmission control
TXE20 RXE20 PS201 PS200 CL20
SL20
0
0
ASIM20
Symbol
Address
When reset
R/W
FF70H
00H
R/W
7
6
5
4
3
2
1
0
Transmission disabled
Transmission enabled
RXE20
0
1
Reception control
Reception disabled
Reception enabled
PS201
0
0
1
1
Parity bit specification
PS200
0
1
0
1
No parity
At transmission, the parity bit is fixed to 0.
At reception, a parity check is not made; no parity error is reported.
Odd parity
Even parity
CL20
0
1
Transmission data character length specification
7 bits
8 bits
SL20
0
1
Transmission data stop bit length
1 bit
2 bits
Cautions 1.
Bits 0 and 1 must be fixed to 0.
If three-wire serial I/O mode is selected, ASIM20 must be cleared to 00H.
Switch operation mode from one mode to another after stopping both serial
transmission and reception.
2.
3.
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