You have written a program for the PIC16F877 which uses interrupts from Timer0 to toggle the state of a port pin connected to an LED. When you start the program, the LED goes from off to on and then stays on. The port pin is the only one which is configured as an output. Which of the following is NOT a plausible explanation:

Question

Accepted Answer

The LED is connected to the wrong port-pin

Answer

The wrong bit-logical instruction was used to toggle the port-pin.

Answer

The ISR did not clear the Timer0 flag

Answer

The ISR routine used the  return  instruction instead of the  retfie  and only ran once

Answer

The pin is toggling so fast that you can't see the LED flashing

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You have written a program for the PIC16F877 which uses interrupts from Timer0 t...

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