What is serial communication in 8051 microcontroller

In the case of serial communication, the interrupts behave a little differently from what we had seen in the post on interrupts. The advantage of using interrupts in serial communication is that while data is being transmitted or received, the microcontroller can perform any other task.

This saves a lot of CPU resources that were being wasted in the polling approach. In the example given below data received at port 1 is transferred to port 2. This data is also transferred serially using UART, and if and data is received from the serial port it is also sent to port 2. We hope that this article helped you understand all the concepts related to serial communication in If you have any doubts, feel free to contact us through the comments section, and we will try to help clear your doubt!

An Engineering Graduate with a specialization in Embedded systems, who loves to dabble with IoT automation cause switching lights on with switches is to mainstream. A bibliophile who loves to travel and experience new cultures. A free course on digital electronics and digital logic design for engineers. Everything is taught from the basics in an easy to understand manner.

A free course on Microprocessors. Start from the basic concepts related to the working of general microprocessors and work upto coding the and If you have ever thought of making an electronic project but didn't know where to start, this free Arduino course will be perfect for you. The post was very interesting especially with your easy language making it simple to learn. One small doubt, during the serial communication you mentioned that clock signal must be divided by 32, and during timer, it must be divided by Why are we dividing by these numbers only?

Are they default numbers or any other reason? Waiting for your valuable reply. Hi Niharika! Good question! These two numbers are not arbitrary. The register is divided into two parts, depending on which timer we will use.

For this tutorial, we will be using Timer 1. Hence, our concern is only the high byte of TMOD. We are selecting Mode 2; we set bit M1, and clear bit M0. More on this mode later below. Next, we have the PCON register. These registers represent the high byte and low byte of bit timers 0 and 1. Moreover, we choose Mode 2: 8-bit auto-reload. Parity can either be even or odd. For even parity, the parity bit makes the number of 1's even. For odd parity, the parity bit makes the number of 1's odd.

Example: The data bits have three 1's. For even parity, the parity bit should be 1 to make the total number of 1's equal to 4 an even number.

For odd parity, the parity bit is 0 since there is already an odd number of 1's. The baud rate, or speed of transmission, is also part of the protocol.

It is important that the sender and the receiver should have the same baud rate. The standard rates are as follows:. I'm not sure why is that but I know that is the maximum serial port speed of old IBM computers popularly know as the first "personal computer".

If you connect a serial output pin which sends a "A" ascii 41 or in binary character to the oscilloscope, this is what you would see on the screen:. If you want to interface your micro to another device which uses serial communication, you need to connect the micro's Tx to the device's Rx and vice versa. The number of UART device varies among microcontrollers.

The only way for it to communicate serially is through bit-banging a method of directly sending bits by pulling a pin high or low at a specific length of time. Example: If you want to send the binary data serially at a speed of 9, baud, you could toggle the state of the Tx pin you assigned based on the binary sequence. The length for which the pin remains on the specified state 1 or 0 would be By experience, software serial is more susceptible to transmission errors than using hardware UART.

The only reason I use software serial is when I need to use multiple serial devices at once. I highly recommend using the hardware UART if you are only using one serial device and your microcontroller supports one. The Beaglebone Black and Raspberry Pi also contain serial communication hardware. Arduino boards communicate with the PC via USB cable or to other serial devices using the serial pins.

Each arduino board has at least one serial port and is at digital pins 0 and 1 Tx and Rx respectively. Using these pins while loading a program to the board causes an error because it's the same pins for USB connection. This is why it's a bad idea to connect the arduino's serial pins directly to a PC's serial port. The USB port which is also serial also uses different voltage levels and protocol.

The AnalogReadSerial example is one of the best starting points in understanding how to use the arduino's serial port. This example reads analog voltage at pin A0 and stores it to the variable sensorValue.

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