參數(shù)資料
型號(hào)： W78ERD2
廠商： WINBOND ELECTRONICS CORP
元件分類(lèi)： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 16/72頁(yè)
文件大?。?/td> 606K
代理商： W78ERD2
W78ERD2
- 16 -
Continued
BIT
NAME
FUNCTION
5
SM2
Multiple processors communication. Setting this bit to 1 enables the multiprocessor
communication feature in mode 2 and 3. In mode 2 or 3, if SM2 is set to 1, then RI
will not be activated if the received 9th data bit (RB8) is 0. In mode 1, if SM2 = 1,
then RI will not be activated if a valid stop bit was not received. In mode 0, the SM2
bit controls the serial port clock. If set to 0, then the serial port runs at a divide by
12 clock of the oscillator. This gives compatibility with the standard 8052.
4
REN
Receive enable: When set to 1 serial reception is enabled, otherwise reception is
disabled.
3
TB8
This is the 9th bit to be transmitted in modes 2 and 3. This bit is set and cleared by
software as desired.
2
RB8
In modes 2 and 3 this is the received 9th data bit. In mode 1, if SM2 = 0, RB8 is the
stop bit that was received. In mode 0 it has no function.
1
TI
Transmit interrupt flag: This flag is set by hardware at the end of the 8th bit time in
mode 0, or at the beginning of the stop bit in all other modes during serial
transmission. This bit must be cleared by software.
0
RI
Receive interrupt flag: This flag is set by hardware at the end of the 8th bit time in
mode 0, or halfway through the stop bits time in the other modes during serial
reception. However the restrictions of SM2 apply to this bit. This bit can be cleared
only by software.
Serial Data Buffer
Bit:
7
6
5
4
3
2
1
0
SBUF.7 SBUF.6 SBUF.5 SBUF.4 SBUF.3 SBUF.2 SBUF.1 SBUF.0
Mnemonic: SBUF Address: 99h
BIT
NAME
FUNCTION
7~0
SBUF
Serial data on the serial port 1 is read from or written to this location. It actually
consists of two separate internal 8-bit registers. One is the receive resister, and the
other is the transmit buffer. Any read access gets data from the receive data buffer,
while write access is to the transmit data buffer.
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