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What does the timer on pic16f877a do?
Once it reaches the Max value, it will roll back to zero setting up an OverFlow flag and generates the interrupt if enabled. Pic16f877a has three indepenndent timer which can be used as timer,Counters or for PWM generation.
How to use interrupts in PIC16F877 microcontroller?
The circuit diagram for using PIC16F877 interrupts is given in the above image. You simply have to connect the LCD to the PIC as we did in interfacing LCD tutorial. Now to connect the interrupt pin, we should look at the datasheet to know which pin of the PIC is used for External interrupt.
Is the pspif reserved on pic16f873a / 876a?
Note (1): PSPIF is reserved on PIC16F873A/876A devices; always maintain this bit clear. The PIE2 register contains the individual enable bits for the CCP2 peripheral interrupt, the SSP bus collision interrupts, EEPROM writes operation interrupt, and the comparator interrupt.
What happens when the timer reaches its maximum value?
As the timer increments and when it reaches its maximum value of 255 (for 8-bit timers) or 65536 (for 16-bit timers), it will trigger an interrupt and initialize itself to 0 back again. This interrupt is called as the Timer Interrupt. This interrupt informs the MCU that this particular time has lapped.
What are the interrupt routines in the pic16f887 microcontroller?
The microcontroller PIC16F887 has many software and hardware interrupt routines and 3 timer modules which are: Timer0 (8-bit), Timer1 (16-bit) and Timer2 (8-bit). This topic shows how to use: The first two are hardware interrupts whereas the others are software interrupts.
When does timer0 generate an interrupt in CCS C?
Timer0 will generate an interrupt when the TMR0 register overflows from FFh to 00h. The T0IF interrupt flag bit of the INTCON register is set every time the TMR0 register overflows, regardless of whether or not the Timer0 interrupt is enabled. The T0IF bit must be cleared in software.