參數(shù)資料
型號(hào)： W78IRD2A
廠商： WINBOND ELECTRONICS CORP
元件分類： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁數(shù)： 39/76頁
文件大小： 646K
代理商： W78IRD2A
W78IRD2/W78IRD2A
Publication Release Date: February 14, 2007
- 39 -
Revision A9
As mentioned before, data enters and leaves the serial port on RxD. TxD line provides the shift clock,
which shifts data into and out of the W78IRD2 and the device at the other end of the line. Any
instruction that writes to SBUF starts the transmission. The shift clock is activated, and the data is
shifted out on the RxD pin until all eight bits are transmitted. If SM2 is set to 1, the data appears on
RxD one clock period before the falling edge on TxD, and the TxD clock then remains low for two
clock periods before going high again. If SM2 is set to 0, the data appears on RxD three clock periods
before the falling edge on TxD, and the TxD clock then remains low for six clock periods before going
high again. This ensures that the receiving device can clock RxD data on the rising edge of TxD or
when the TxD clock is low. Finally, the TI flag is set high in C1 once the last bit has been transmitted.
The serial port receives data when REN is 1 and RI is zero. The TxD clock is activated, and the serial
port latches data on the rising edge of the shift clock. As a result, the external device should present
data on the falling edge of TxD. This process continues until all eight bits have been received. Then,
after the last rising edge on TxD, the RI flag is set high in C1, which stops reception until RI is cleared
by the software.
10.2 MODE 1
Mode 1 is a full–duplex, asynchronous mode. Serial communication frames are made up of ten bits
transmitted on TXD and received on RXD. The ten bits consist of a start bit (0), eight data bits (LSB
first), and a stop bit (1). When the W78IRD2 receives data, the stop bit goes into RB8 in SCON. The
baud rate is either 1/16 or 1/32 of the Timer 1 overflow, which can be set to a variety of reload values.
(The 1/16 or 1/32 factor is determined by the SMOD bit in PCON SFR.) The functional diagram is
shown below.
SBUF
RB8
Transmit Shift Register
Receive Shift
Register
TX SHIFT
PAROUT
D8
Internal
Data Bus
Internal
Data
Bus
TXD
RXD
Serial Port
Interrupt
SMOD =
TCLK
RCLK
SAMPLE
Write to
SBUF
TX START
SOUT
0
1
0
1
TI
1
0
PARIN
STOP
START
LOAD
CLOCK
Read
SBUF
Timer 2
Overflow
Timer 1
Overflow
TX CLOCK
RI
SERIAL
CONTROLLER
RX CLOCK
LOAD
SBUF
RX
START
RX SHIFT
2
16
1-TO-0
DETECTOR
BIT
DETECTOR
16
CLOCK
SIN
Figure 10-2 Serial Port Mode 1
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