How is baud rate calculated in PIC16F877A?
Baud Rate = Fosc / (16 (X + 1)) The desired baudrate is 9600 bps and crystal frequency, Fosc is 20 MHz. This gives X as 129 (81 in hexadecimal) which is loaded in SPBRG. Any change in crystal frequency/baudrate changes this value as per the above equation.
How do you set the 16 bit baud rate mode in UART of PIC18F4550?
Steps for Programming PIC18F4550 USART
- Initialize the Baud Rate by loading a value into the SPBRG register.
- Then set bit SPEN in the RCSTA for enabling Serial Port.
- Then set bit BRGH in the TXSTA for low or high speed.
- Also clear bit SYNC in the TXSTA register for asynchronous communication.
How does UART serial work?
How UART Works? In UART Serial Communication, the data is transmitted asynchronously i.e. there is no clock or other timing signal involved between the sender and receiver. Instead of clock signal, UART uses some special bits called Start and Stop bits.
Which pins are for TXD?
11th pin is TXD (serial data transmit pin) which is serial output pin. Through this output signal microcontroller transmits data for serial communication.
Can pic16f877a be used for serial/UART communication?
In this tutorial we are going to discuss the serial/UART communication using PIC16F877A. PIC16F877A comes with inbuilt USART which can be used for Synchronous/Asynchronous communication. We will be discussing only the UART.
What is pic16f877a MCU?
Here we have used PIC16F877A MCU, it has a module called “Addressable Universal Synchronous Asynchronous Receiver and Transmitter” shortly known as USART . USART is a two wire communication system in which the data flow serially.
Can pic16f877a be used for synchronous/asynchronous communication?
PIC16F877A comes with inbuilt USART which can be used for Synchronous/Asynchronous communication. We will be discussing only the UART. After understating the basics of PIC16F877A UART module, We will see how to use the ExploreEmbedded libraries to communicate with any of the UART devices.
What is the criteria for UART communication?
The main criteria for UART communication is its baud rate. Both the devices Rx/Tx should be set to same baud rate for successful communication. This can be achieved by SPBRG register.