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參數資料
| 型號： | W77E516 |
| 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： | 67/85頁 |
| 文件大?。?/td> | 596K |
| 代理商： | W77E516 |
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Preliminary W77E516
Publication Release Date: August 16, 2002
- 67 -
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 (1). 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. 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 shifting in 9 data bits, there is one more shift to do, after which the SBUF and RB8
are loaded and RI is set. However certain conditions must be met before the loading and setting of
RI can be done.
1. RI must be 0 and
2. Either SM2 = 0, or the received stop bit = 1.
If these conditions are met, then the D8 bit goes to RB8, the 8 data bits go into SBUF and RI is set.
Otherwise the received frame may be lost. After the middle of the stop bit, the receiver goes back to
looking for a 1-to-0 transition on the RxD pin.
相關PDF資料 |
PDF描述 |
|---|---|
| W77E516-25 | 8-BIT MICROCONTROLLER |
| W77E516-40 | 8-BIT MICROCONTROLLER |
| W77E516F-25 | 8-BIT MICROCONTROLLER |
| W77E516F-40 | 8-BIT MICROCONTROLLER |
| W77E516P-25 | 8-BIT MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W77E516-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516A40DL | 功能描述:IC MCU 8-BIT 64K FLASH 40-DIP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W77 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數:40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數據轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
| W77E516A40FL | 功能描述:IC MCU 8-BIT 64K FLASH 44-QFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W77 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數:40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數據轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
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