參數(shù)資料
型號: μPD789216Y
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 68/144頁
文件大小: 632K
代理商: ΜPD789216Y
Preliminary Product Information
68
μ
PD789216Y, 789217Y
(b) Asynchronous serial interface mode register 20 (ASIM20)
ASIM20 is used to make the settings related to serial interface 20 used in 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. Format of Asynchronous Serial Interface Mode Register 20
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
Odd parity
Even parity
At transmission, the parity bit is fixed to 0.
At reception, a parity check is not made; no parity error is reported.
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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