How to use timer interrupt in PIC?

How to use timer interrupt in PIC?

Code

1. Calculate the Timer Count for the required delay.
2. Set the Presaclar bits in OPTION_REG as per the delay calculations.
3. Clear the PSAbit for using the prescalar.
4. Select the Clock Source Internal/External using TOCS bit.
5. Load the timer value into TMRO register.
6. Enable the Timer0 Interrupt by setting TMR0IE bit.

What is the use of timer flag interrupt?

The Timer/Counter Interrupt Flag Register. The OCF2 bit is set (one) when a compare match occurs between the Timer/Counter2 and the data in OCR2 – Output Compare Register 2. OCF2 is cleared by hardware when executing the corresponding interrupt handling vector.

How many timer is present in 16f877a?

three timer modules
The PIC16F877A basically has three timer modules. These timer module terminals are also multiplexed with other functions for handling alternate functions. These three-timer modules as named as TIMER 0, TIMER 1 and TIMER 2.

How to use PIC microcontroller timers as an interrupt?

Set GIE to 1 to enable global interrupts. Set TMR0IE to 1 to enable timer0 interrupts. Now an overflow of timer0 will set TMR0IF bit, and cause an interrupt. You will need to test TMR0IF to verify the cause of interrupt and reset it to zero in ISR.

What is the external interrupt pin on the pic16f690?

There are many different ways to trigger an interrupt on the PIC16F690. One of those is the External Interrupt pin. On the 16F690 this is pin 17 and it is called INT (RA2). This allows you to interrupt code execution when either a rising or falling edge is detected on the INT pin (RA2).

When to use timer ISR on 16 bit?

Every time a timer register overflows, a special function know as Timer interrupt service routine starts executing. Similarly for a 16 bit timer, Timer ISR launches whenever the value of timer exceeds 65,535.

What is the interrupt service routine in Pic?

The regular code then proceeds as before. The code that is run when an interrupt occurs is called an Interrupt Service Routine (ISR). It is a special function that only runs when there is an interrupt. The PIC16F690 can only have one Interrupt Service Routine.