The PIC 18 microcontroller has two to five timers that can be used as timers to generate time delays or counters to count external events. The document discusses Timer 0 and Timer 1, how they work in C code, and interrupt programming which allows writing interrupt service routines to handle interrupts in a round-robin fashion through the interrupt vector table and INTCON register.

1. More about PIC

2. Timer 0
• The PIC 18 has two to five timers (depends on family)
• They can be used as
• Timer  to generate time delay
• Counters  count event happening outside the
microcontroller.

3. Timer 0

4. Timer 0

5. Timer 0

6. Timer 0

7. Timer 0

8. Timer 0

9. Timer 0

10. Timer 1

11. Timer 1

12. Timer 1

13. Timer 0 and 1 in C

14. Timer 0 and 1 in C

15. Timer 0 and 1 in C

16. Interrupt Programming
• Interrupt
• The program associated with interrupt is called the interrupt service routine
(ISR) or interrupt handler.
• Polling
• The microcontroller continuously monitors the status of a given device.
• Round-robin fashion (no priorities).

17. Interrupt service routine
• Upon activation of an interrupt,

18. Interrupt vector table (PIC18)

19. Simplified view of interrupts

20. INTCON (interrupt control) register

21. Summary