At89c51 serial port

JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Program AT89C51 using serial port. Thread starter imaginationbeyond Start date Feb 19, Status Not open for further replies. If yes than what is the software required for it?? I m in trouble Receive bit 8. The 9th bit received in mode 2 and 3. Transmit Flag.

Set when a byte has been completely transmitted. Receive Flag. Set when a byte has been completely received. Additionally, it is necessary to define the function of SM0 and SM1 by an additional table:.

Serial Mode. Baud Rate. Thus, well go through each bit and review its function. The first four bits bits 4 through 7 are configuration bits. Bits SM0 and SM1 let us set the serial mode to a value between 0 and 3, inclusive. The four modes are defined in the chart immediately above. In modes 0 and 2 the baud rate is fixed based on the oscillators frequency. In modes 1 and 3 the baud rate is variable based on how often Timer 1 overflows.

Well talk more about the various Serial Modes in a moment. The next bit, SM2 , is a flag for "Multiprocessor communication. This lets the program know that a byte has been received and that it needs to be processed.

However, when SM2 is set the "RI" flag will only be triggered if the 9th bit received was a "1". That is to say, if SM2 is set and a byte is received whose 9th bit is clear, the RI flag will never be set.

Serial characters that are transmitted byt the simulated microcontroller appear in the serial window. Whenever the simulated serial port transmits a character, the value transmitted is automatically assigned to SOUT which is read-only. You may read the value of SOUT to determine the character transmitted by your simulated program. All rights reserved. This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies.

Change Settings. In the parallel mode, data transfer is fast and uses more number of lines. This mode is good for short range data transfer. Serial communication on the other hand, uses only one or two data lines to transfer data and is generally used for long distance communication.

In serial communication the data is sent as one bit at a time. This article describes the interfacing of microcontroller AT89C51 with a computer via serial port, RS Serial communication is commonly used in applications such as industrial automation systems, scientific analysis and certain consumer products. Serial Port. The serial communication is done in the asynchronous mode. A serial port, like other PC ports, is a physical interface to establish data transfer between computer and an external hardware or device.

This transfer, through serial port, takes place bit by bit. In RS, high and low bits are represented by flowing voltage ranges:. You must be logged in to post a comment. Voltage Range in V. Therefore, while connecting an RS to microcontroller system, a voltage converter is required.