參數(shù)資料
型號: 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): 38/76頁
文件大?。?/td> 646K
代理商: W78IRD2A
W78IRD2/W78IRD2A
- 38 -
10. ENHANCED FULL DUPLEX SERIAL PORT
The W78IRD2 serial port is a full-duplex port, and the W78IRD2 provides additional features such as
frame-error detection and automatic address recognition. The serial port runs in one of four operating
modes.
Serial Ports Modes
SM1
SM0
MODE
TYPE
BAUD CLOCK
FRAME
SIZE
START
BIT
STOP
BIT
9TH BIT
FUNCTION
0
0
0
Synch.
12 TCLKS
8 bits
No
No
None
0
1
1
Asynch.
Timer 1 or 2
10 bits
1
1
None
1
0
2
Asynch.
32 or 64 TCLKS
11 bits
1
1
0, 1
1
1
3
Asynch.
Timer 1 or 2
11 bits
1
1
0, 1
In synchronous mode (mode 0), the W78IRD2 generates the clock and operates in a half-duplex
mode. In asynchronous modes (modes 1 – 3), full-duplex operation is available so that the serial port
can simultaneously transmit and receive data. In any mode, register SBUF functions as both the
transmit register and the receive buffer. Any write to SBUF writes to the transmit register, while any
read from SBUF reads from the receive buffer. The rest of this section discusses each operating mode
and then discusses frame-error detection and automatic address recognition.
10.1 MODE 0
Mode 0 is a half-duplex, synchronous mode. RxD transmits and receives serial data, and TxD
transmits the shift clock. The TxD clock is provided by the W78IRD2. Eight bits are transmitted or
received per frame, LSB first. The baud rate is fixed at 1/12 of the oscillator frequency. The functional
block diagram is shown below.
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
12
osc
Figure 10-1 Serial Port Mode 0
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