參數(shù)資料
型號: μPD789217Y
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): 67/144頁
文件大?。?/td> 632K
代理商: ΜPD789217Y
Preliminary Product Information
67
μ
PD789216Y, 789217Y
(3) Serial interface 20 control registers
The following four types of registers are used to control serial interface 20.
Serial operation mode register 20 (CSIM20)
Asynchronous serial interface mode register 20 (ASIM20)
Asynchronous serial interface status register 20 (ASIS20)
Baud rate generator control register 20 (BRGC20)
(a) Serial operation mode register 20 (CSIM20)
CSIM20 is used to make the settings related to three-wire serial I/O mode.
CSIM20 is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input clears CSIM20 to 00H.
Figure 6-33. Format of Serial Operation Mode Register 20
CSIE20
0
1
Three-wire serial I/O mode operation control
CSIE20
SSE20
0
0
DAP20
DIR20 CSCK20 CKP20
CSIM20
Symbol
Address
When reset
R/W
FF72H
00H
R/W
7
6
5
4
3
2
1
0
Operation disabled
Operation enabled
DIR20
0
1
First-bit specification
MSB
LSB
CSCK20
0
1
Three-wire serial I/O mode clock selection
External clock pulse input to the SCK20 pin
Output of the dedicated baud rate generator
SSE20
0
1
Not used
Used
DAP20
0
1
Three-wire serial I/O mode data phase selection
Outputs at the falling edge of SCK20.
Outputs at the rising edge of SCK20.
SS20-pin selection
Functions of the SS20/P26 pin
Port function
0
1
Communication status
Communication enabled
Communication enabled
Communication disabled
CKP20
0
1
Three-wire serial I/O mode clock phase selection
Clock is low active; SCK20 is high in the idle state
Clock is high active; SCK20 is low in the idle state
Cautions 1.
Bits 4 and 5 must be fixed to 0.
CSIM20 must be cleared to 00H, if UART mode is selected.
2.
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