參數(shù)資料
型號(hào)： W77LE58F-25
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 8 BIT MICROCONTROLLER
中文描述： 8-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP44
封裝： QFP-44
文件頁(yè)數(shù)： 61/81頁(yè)
文件大?。?/td> 657K
代理商： W77LE58F-25
Preliminary W77LE58
Publication Release Date: August 1999
- 61 - Revision A1
duplex operation is available. This means that it can simultaneously transmit and receive data. The
transmit register and the receive buffer are both addressed as SBUF Special Function Register.
However any write to SBUF will be to the transmit register, while a read from SBUF will be from the
receive buffer register. The serial port can operate in four different modes as described below.
MODE 0
This mode provides synchronous communication with external devices. In this mode serial data is
transmitted and received on the RXD line. TXD is used to transmit the shift clock. The TxD clock is
provided by the W77LE58 whether the device is transmitting or receiving. This mode is therefore a
half duplex mode of serial communication. In this mode, 8 bits are transmitted or received per frame.
The LSB is transmitted/received first. The baud rate is fixed at 1/12 or 1/4 of the oscillator frequency.
This baud rate is determined by the SM2 bit (SCON.5). When this bit is set to 0, then the serial port
runs at 1/12 of the clock. When set to 1, the serial port runs at 1/4 of the clock. This additional facility
of programmable baud rate in mode 0 is the only difference between the standard 8051 and the
W77LE58.
The functional block diagram is shown below. Data enters and leaves the Serial port on the RxD line.
The TxD line is used to output the shift clock. The shift clock is used to shift data into and out of the
W77LE58 and the device at the other end of the line. Any instruction that causes a write to SBUF will
start the transmission. The shift clock will be activated and data will be shifted out on the RxD pin till
all 8 bits are transmitted. If SM2 = 1, then the data on RxD will appear 1 clock period before the
falling edge of shift clock on TxD. The clock on TxD then remains low for 2 clock periods, and then
goes high again. If SM2 = 0, the data on RxD will appear 3 clock periods before the falling edge of
shift clock on TxD. The clock on TxD then remains low for 6 clock periods, and then goes high again.
This ensures that at the receiving end the data on RxD line can either be clocked on the rising edge
of the shift clock on TxD or latched when the TxD clock is low.
SBUF
Transmit Shift Register
Receive Shift Register
TX
SHIFT
PAROUT
Internal
Data Bus
Internal
Data Bus
RXD
P3.0 Alternate
Output Function
TXD
P3.1 Alternate
Output function
RXD
P3.0 Alternate
Iutput function
Serial Port Interrupt
Write to
SBUF
TX
START
SOUT
TI
RI
REN
PARIN
LOAD
CLOCK
Read SBUF
SBUF
TX CLOCK
RI
SERIAL
CONTROLLE
SHIFT
CLOCK
RX
CLOCK
LOAD SBUF
RX
START
RX SHIFT
CLOCK
SIN
4
12
1
0
SM2
Clock Source
Mode
div. by 4 osc/1
div. by 64 osc/16
div. by 1024 osc/256
input
Figure 20. Serial Port Mode 0
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