Using UART of PIC Microcontroller – MPLAB XC8. By Ligo George MPLAB XC8, PIC Microcontroller. It is a very popular serial communication interface which provides Full Duplex communication between two devices. UART uses two data lines for sending (TX) and receiving (RX) data. Master Code #define _XTAL_FREQ 8000000 #include #. Finally we will burn this demo in a PIC16F877A and establish a serial communication with PC. Serial Communication. Their are several serial communication standards like RS232, SPI, I2C etc. Of which RS232 is a asynchronous method. Code Libraries (13) Code Snippets (10) Electronics (6) GSM Projects (2) Hardwares (8) Microchip PIC Tutorials.
Page Contents • • • • • • • What is serial communication? Unlike parallel communication, where several bits are send at one time, Serial Communication is a process of transmitting data bit by bit.
In this tutorial, you will learn how to serially communicate a PC or any other device with a PIC microcontroller. You will also study the use of a communication component – UART (Universal Asynchronous Receiver Transmitter) present within the microcontroller. Serial vs Parallel Transfer Computers transfer data in two ways: serial and parallel. In serial Communication, only a single wire is required to transfer n bits of data or one or two wires for ready and acknowledge signals whereas in parallel communication, n wires are required to transfer n bits of data. Serial mode is used to transfer data to greater distances and parallel only works for short distances.
Since more hardware is required in parallel communication mode, hence, serial communication is preferred.In data Transmission, if data can both be transmitted and received, it is a duplex transmission. In contrast, a simplex transmission only sends data from one device to the other such as from computer to printer. Duplex Transmission can be Half or Full duplex depending upon whether the data transfer is simultaneous or not. If data is transmitted one way at a time, then it is half duplex. If data can go both ways at the same time then it is Full duplex. PIC microcontroller has a full-duplex, serial mode of Communication.Half and Full-Duplex Transmission. Data Transfer Rate – Baud Rate The rate of data in serial data communication is known as bits per second or bps.
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Usually Baud rate is used instead. However, the baud rate and bps are not necessarily equal. This is because baud rate is a modern terminology and is defined as the number of signal changes per second. In modems, sometimes a signal change of signal transfers several bits of data.
So there is small difference between bit rate (bps) and baud rate. Different Serial Communication Protocols Different protocols are used in data communication for efficient transfer of data between different devices.
Some of the serial protocols include RS232, Ethernet, I2C, I2S, PCI, PCI Express, USB etc. In this lab we will be using RS-232 standard protocol. PC Serial Port vs Microcontrollers Serial Port This method of serial communication used by a uController is referred to as TTL serial (transistor-transistor logic). Serial communication at a TTL level will always remain between the limits of 0V and Vcc, which is often 5V or 3.3V. So, you may see where the problem lies in interfacing these two signals.