This PIC16F877 microcontroller tutorial answers the question,
” How to use timer0 of PIC16F877 and how to handle its interrupts? ”
Using PIC16 simulator (Proteus) you can verify this PIC timer0 code and change it according to your needs. This code is written in C language using MPLAB with HI-TECH C compiler. You can download this code from the ‘Downloads‘ section at the bottom of this page.
It is assumed that you know how to blink an LED with PIC16F877 microcontroller. If you don’t then please read this page first, before proceeding with this article.
The following diagram (made in Proteus) shows the PIC microcontroller circuit diagram.
In this circuit, PIC16F877 is running on external crystal of 20MHz value. RB0 pin is toggled every time timer0 expires and executes it’s ISR code. In the above figure, it is clear that after approximately every 100usec, RB0 pin is toggled i-e timer0 expires. You can easily change this value in the code.
The main function code is shown below.
Timer0 code for PIC16F877 was compiled in MPLAB v8.85 with HI-TECH C v9.83 compiler and simulation was made in Proteus v7.10. To download code and Proteus simulation click here.
For more detail: PIC16F877 timer0 code and Proteus simulation