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參數(shù)資料
| 型號： | W77IE58 |
| 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, 25 MHz, MICROCONTROLLER, PDIP40 |
| 封裝： | DIP-40 |
| 文件頁數(shù)： | 71/90頁 |
| 文件大?。?/td> | 409K |
| 代理商： | W77IE58 |
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Preliminary W77IE58
Publication Release Date: July 2000
- 71 -
Revision A1
MODE 2
This mode uses a total of 11 bits in asynchronous full-duplex communication. The functional description
is shown in the figure below. The frame consists of one start bit (0), 8 data bits (LSB first), a
programmable 9th bit (TB8) and a stop bit (0). The 9th bit received is put into RB8. The baud rate is
programmable to 1/32 or 1/64 of the oscillator frequency, which is determined by the SMOD bit in PCON
SFR. Transmission begins with a write to SBUF. The serial data is brought out on to TxD pin at C1
following the first roll-over of the divide by 16 counter. The next bit is placed on TxD pin at C1 following
the next rollover of the divide by 16 counter. Thus the transmission is synchronized to the divide by 16
counter, and not directly to the write to SBUF signal. After all 9 bits of data are transmitted, the stop bit
is transmitted. The TI flag is set in the C1 state after the stop bit has been put out on TxD pin. This will
be at the 11th rollover of the divide by 16 counter after a write to SBUF. Reception is enabled only if REN
is high. The serial port actually starts the receiving of serial data, with the detection of a falling edge on
the RxD pin. The 1-to-0 detector continuously monitors the RxD line, sampling it at the rate of 16 times
the selected baud rate. When a falling edge is detected, the divide by 16 counter is immediately reset.
This helps to align the bit boundaries with the rollovers of the divide by 16 counter. The 16 states of the
counter effectively divide the bit time into 16 slices. The bit detection is done on a best of three basis.
The bit detector samples the RxD pin, at the 8th, 9th and 10th counter states. By using a majority 2 of 3
voting system, the bit value is selected. This is done to improve the noise rejection feature of the serial
port.
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)
SAMPLE
Write to
SBUF
TX
START
TX
CLOCK
SOUT
0
1
TI
PARIN
STOP
START
LOAD
CLOCK
Read
SBUF
RI
SERIAL
CONTROLLER
RX CLOCK
LOAD
SBUF
RX START
RX SHIFT
2
16
1-TO-0
DETECTOR
BIT
DETECTOR
16
CLOCK
SIN
D8
TB8
Clock Source
Mode input
div. by 4 osc/2
div. by 64 osc/32
div. by 1024 osc/512
Figure 22. Serial Port Mode 2
If the first bit detected after the falling edge of RxD pin, is not 0, then this indicates an invalid start bit,
and the reception is immediately aborted. The serial port again looks for a falling edge in the RxD line. If
a valid start bit is detected, then the rest of the bits are also detected and shifted into the SBUF. After
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| W77L32 | 8-BIT MICROCONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W77IE58_06 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77J_1G WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| W77J_2GST WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| W77J_3G WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| W77L032A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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