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參數(shù)資料
型號(hào)： W79E532A40FL
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, PQFP44
封裝： ROHS COMPLIANT, QFP-44
文件頁(yè)數(shù)： 54/77頁(yè)
文件大小： 523K
代理商： W79E532A40FL
W79E532/W79L532
- 54 -
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
Table 10. Serial Ports Modes
SM1
SM0
MODE
TYPE
BAUD CLOCK
FRAME
SIZE
8 bits
10 bits
11 bits
11 bits
STAR
T BIT
No
1
1
1
STOP
BIT
No
1
1
1
9TH BIT
FUNCTION
None
None
0, 1
0, 1
0
0
1
1
0
1
0
1
0
1
2
3
Synch.
Asynch.
Asynch.
Asynch.
4 or 12 T
CLKS
Timer 1 or 2
32 or 64
T
CLKS
Timer 1 or 2
12.1
Framing Error Detection
A Frame Error occurs when a valid stop bit is not detected. This could indicate incorrect serial data
communication. Typically the frame error is due to noise and contention on the serial communication
line. The W79E(L)532 has the facility to detect such framing errors and set a flag which can be
checked by software.
The Frame Error FE(FE_1) bit is located in SCON.7. This bit is normally used as SM0 in the standard
8051 family. However, in the W79E(L)532 it serves a dual function and is called SM0/FE. There are
actually two separate flags, one for SM0 and the other for FE. The flag that is actually accessed as
SCON.7 is determined by SMOD0 (PCON.6) bit. When SMOD0 is set to 1, then the FE flag is
indicated in SM0/FE. When SMOD0 is set to 0, then the SM0 flag is indicated in SM0/FE.
The FE bit is set to 1 by hardware but must be cleared by software. Note that SMOD0 must be 1 while
reading or writing to FE. If FE is set, then any following frames received without any error will not clear
the FE flag. The clearing has to be done by software.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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W79E532A40PN 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER
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