mplab xc8 how to change timer frequency code

Timer mode is selected by clearing the TOCS bit (OPTION register, bit 5). We will discuss the two modes of Timer0 separately.īlock diagram of Timer0 Module (Source: Microchip) The Timer0 can also count external pulses arriving at the RA2 pin (11), which has the alternate name T0CKI (Timer Zero Clock Input). While counting the external pulses, it is said that it operates as a counter. When the Timer0 module is driven by the processor’s instruction clock, it is said to operate as a timer because it increments at a constant rate (defined by the processor clock) and if you know the number of pulses counted, you can derive how much time has elapsed. If you write a value to it, the counter will start incrementing from there. The Timer0 module in a PIC16F688 microcontroller is an 8-bit synchronous counter that stores the value for the counter in the special function register called TMR0. This register can be read or written at any time by software.

It is simply an independent binary counter that can be configured to count instruction cycles or to count external clock pulses. The fundamental concept of a timer/counter module is discussed in Timers and Counters. Today’s lab lesson will explore the functionality of the Timer0 module. A PIC16F688 microcontroller has two built-in hardware timer modules: Timer0 and Timer1.

Since it runs independently, it can count pulses concurrently with the main program execution.

The main component of a timer module is a free running binary counter that increments for each incoming pulse. They can be used to perform a variety of time precision functions, such as generating events at specific times, measuring the duration of an event, keeping date and time record, counting events, etc. PIC microcontrollers are equipped with one or more precision timing systems known as Timers.

Mplab xc8 how to change timer frequency code