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參數(shù)資料
型號: W77E516P-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, 40 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 69/85頁
文件大小: 596K
代理商: W77E516P-25
Preliminary W77E516
Publication Release Date: August 16, 2002
- 69 -
Revision A1
Mode 3
This mode is similar to Mode 2 in all respects, except that the baud rate is programmable. The user
must first initialize the Serial related SFR SCON before any communication can take place. This
involves selection of the Mode and baud rate. The Timer 1 should also be initialized if modes 1 and
3 are used. In all four modes, transmission is started by any instruction that uses SBUF as a
destination register. Reception is initiated in Mode 0 by the condition RI = 0 and REN = 1. This will
generate a clock on the TxD pin and shift in 8 bits on the RxD pin. Reception is initiated in the other
modes by the incoming start bit if REN = 1. The external device will start the communication by
transmitting the start bit.
Table 10. Serial Ports Modes
SM1
SM0
MODE
TYPE
BAUD CLOCK
FRAME
SIZE
START
BIT
STOP
BIT
9TH BIT
FUNCTION
0
0
0
Synch.
4 or 12 T
CLKs
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 T
CLKs
11 bits
1
1
0, 1
1
1
3
Asynch.
Timer 1 or 2
11 bits
1
1
0, 1
SBUF
RB8
Transmit Shift Register
Receive Shift
Register
TX SHIFT
PAROUT
D8
Internal
Data Bus
Internal
Data
Bus
TXD
RXD
Serial Port
Interrupt
SMOD=
(SMOD_1)
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
(for Serial Port 0 only)
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
D8
TB8
Figure 23: Serial Port Mode 3
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