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Is a clock source selector bit of Timer0?
The Timer0 source is selected using the Timer0 Clock Source Select bit. Setting or clearing this bit will select one of the channels on the multiplexer (see Figure 1-6).
What is the difference between Timer0 and Timer2?
Seems that the asynchronous timer2 is designed for connecting an external crystal. And the timer0 is designed for connecting an external clock source.
How many timer is Pic16f877a?
three Timers
Pic16f877a has three indepenndent timer which can be used as timer,Counters or for PWM generation. Below table provides the details of the three Timers.
How we can use Timer0 as timer and counter?
Timer0 is worked as timer and counter. In timer mode, the module increments on every clock by default, unless a prescaler value is written into TMR0 register. Clear the T0CS bit(5th bit) of T0CON register to select the timer mode.
Which pin is an Timer0?
In 8-Bit Counter mode, the Timer0 module will increment on every rising or falling edge of the T0CKI I/O pin. This allows the PIC® MCU to count pulses from an external clock source. The signal has voltage limits as specified in the device data sheet but will typically be the limits of the device’s operating voltage.
What is the use of prescaler in Timer0?
The purpose of the prescaler is to allow the timer to be clocked at the rate a user desires. For shorter (8 and 16-bit) timers, there will often be a tradeoff between resolution (high resolution requires a high clock rate) and range (high clock rates cause the timer to overflow more quickly).
What are the three timers on the pic16f877a?
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 does the timer work in a PIC microcontroller?
For example if the value of prescaler is 64, then for every 64 th pulse the Timer will be incremented by 1. As the timer increments and when it reaches to its maximum value of 255, it will trigger an interrupt and initialize itself to 0 back again.
What does the prescaler do on the pic16f877a?
Prescaler: Prescaler is a block that presents inside the timer module and it is used to divide the clock frequency by a constant. It allows the timer to be clocked at the rate a user desires. The PIC16F877A basically has three timer modules.
What are the features of the timer0 module?
The Timer0 module timer/counter has the following features: To start using a timer we should understand some of the fancy terms like 8-bit/16-bit timer, Prescaler, Timer interrupts and Focs. Now, let us see what each one really means.