1- Given the PIC16F84A system clock frequency is 1MHz and that Timer0 is setup to be clocked by the internal instruction clock, calculate the Timer0 overflow rate assuming no preload value is used:-

2- Given a system frequency of 1MHz determine the value to write to the option register, and any preload value necessary for Timer0, if you wish Timer0 to overflow at a rate of 500 overflows/sec.

3- Explain what an Interrupt is, in the context of microcontrollers. Describe the internal microcontroller activity that occurs when an Interrupt event is triggered.

4- For the PIC16F84A list the events that can cause an Interrupt to occur.

5- State the relevant SFR and the value to write to it, in order to enable an interrupt to occur when Timer0 overflows.