Contents
What is TMR0?
The Timer0 is more than just a timer. It has all the following features: 8-bit timer/counter register (TMR0) The Timer0 module can be used as an 8-bit timer. In timer mode, it is incremented on every instruction clock pulse unless a prescaler is used to reduce the speed.
How many timers are there in PIC16F877A?
three
PIC Timer Module Pic16f877a has three indepenndent timer which can be used as timer,Counters or for PWM generation.
What is Intcon register?
The INTCON register is a readable and writable register which contains the various enable bits for all interrupt sources. No interrupt to the CPU will result unless the GIE bit is set. The GIE bit is the bit INTCON<7> and when set, enables all un-masked interrupts.
What are the features of Timer0?
TIMER 0
- 8-bit timer/counter with prescaler.
- Readable and Writable.
- Internal or external Clock set.
- Build 8-bit software programmable prescaler.
- Edge select for external clock.
- Interrupt on overflow from 0XFF to 0X00.
Which timer can be used in 8 and 16 bit mode?
The 8051 has two timers, Timer 0 and Timer 1. They can be used as timers or as event counters. Both Timer 0 and Timer 1 are 16-bit wide. Since the 8051 follows an 8-bit architecture, each 16 bit is accessed as two separate registers of low-byte and high-byte.
What is the tmr0 flag in pic16f877a?
The TMR0 module is an 8-bit timer/counter with the following features: The below table shows the registers associated with PIC16f877A Timer0 module. This register contains the Timer0 overflow flag (TMR0IF) and corresponding Inetrrupt Enable flag (TMR0IE).
What are the registers associated with the pic16f877a timer?
The timer TMR1 module is an 16-bit timer/counter with the following features: The below table shows the registers associated with PIC16f877A Timer1 module. This register holds the higher 8-bits of timer value. TMR1H and TMR1L are used in pair to increment from 0000 – FFFFh
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.
How is the pic16f877a external interrupt pin connected?
My PCLK is 11.0592MHz. Whenever I press the switch it generates the interrupt and glows the LED. The switch is connected to an External interrupt pin. In our next tutorial, we will see how to use the multiple external interrupts in PIC16F877A.