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參數(shù)資料
型號(hào)： W79E648
廠商： WINBOND ELECTRONICS CORP
英文描述： Fast 8051 Compatible microcontroller with a redesigned Processor
中文描述： 快速8051兼容微控制器重新設(shè)計(jì)的處理器
文件頁(yè)數(shù)： 52/80頁(yè)
文件大小： 407K
代理商： W79E648
Preliminary W79E648
- 52 -
11. SERIAL PORT
Serial port in the W79E648 is a full duplex port. The W79E648 provides the user with additional
features such as the Frame Error Detection and the Automatic Address Recognition. The serial ports
are capable of synchronous as well as asynchronous communication. In Synchronous mode the
W79E648 generates the clock and operates in a half duplex mode. In the asynchronous mode, full
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 W79E648 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
W79E648.
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
W79E648 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.
相關(guān)PDF資料
PDF描述
W79E802 8-BIT MICROCONTROLLER
W79E802A 8-BIT MICROCONTROLLER
W79E802ADG 8-BIT MICROCONTROLLER
W79E802ASG 8-BIT MICROCONTROLLER
W79E803 8-BIT MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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W79E802 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
W79E802A 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
W79E802ADG 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
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