1. PIC 16F84 Interfacing

4. Port A & TRISA Registers Block diagram of Pins RA3:RA0 Block diagram of Pin RA4

5. Port A & TRISA Registers Inputting (Reading) 1 from a Pin the PIC16 1 1 0 x 1 OFF 0 OFF 1 1 1 1 1 1 TRIS = 1

6. Port A & TRISA Registers Inputting (Reading) 0 from a Pin the PIC16 1 1 0 x 1 OFF 0 OFF 0 0 0 0 0 0 TRIS = 1

7. Port A & TRISA Registers Outputting (Writing) 0 to a Pin in the PIC16 0 0 1 1 1 OFF 1 ON zero 0 TRIS = 0

8. Port A & TRISA Registers Outputting (Writing) 1 to a Pin in the PIC16 0 0 1 0 0 ON 0 OFF one 1 TRIS = 0

10. Port B & TRISB Registers Block diagram of Pins RB7:RB4 Block diagram of Pin RB3:RB0

12. Interrupt Cont…

14. INTCON Register INT External Interrupt Enable TMR0 Overflow Interrupt Enable EEPROM Write Complete Interrupt Enable Global Interrupt Enable RB Port Change Interrupt Enable TMR0 Overflow Interrupt Flag INT External Interrupt Flag RB Port Change Interrupt Flag

15. INTCON Register Cont… EECON1

16. Interrupt Execution

17. Example 7.1 The normal activity of program is to output binary count value on Port B. This process will be interrupted by RB0 that will be pulsed manually. The interrupt service routine causes all the outputs to be switched on, and waits for the button RA4 to be pressed. The routine then terminates by restoring the previous value in Port B data register and returns to the main program at the original point.

18. Example 7.1 cont… No Yes

19. Example 7.1 Cont… Yes No

20. Example 7.1 Cont…

21. Example 7.1 Cont…

22. Example 7.1 Cont…

23. Interrupt on Pins RB4-RB7

24. Interrupt on Pins RB4-RB7 cont…

25. Interrupt on Pins RB4-RB7 cont…

26. Interrupt on Pin RB0

27. Interrupt on Pin RB0 cont…

28. Interrupt on Pin RB0 cont…

30. Using TMR0

31. Counter Mode

35. Example 7.3 cont…

36. Example 7.3 cont…

37. Interrupt by Overflow on TMR0

38. Interrupt by Overflow on TMR0 cont…

39. Interrupt by Overflow on TMR0 cont…

40. Serial Communication

46. Voltage Level Conversion cont… Macro for serial communication

49. Analogue to Digital Conversion cont… 16C7X device specifications Device I/O A/D Channels Program Memory Data Memory Current Source/Sink 16C71 13 4 1k 36 25mA 16C73 22 5 4k 192 25mA 16C75 33 8 4k 192 25mA 16C710 13 4 512 36 25mA 16C711 13 4 1k 68 25mA 16C715 13 4 2k 128 25mA 16C72 22 5 2k 128 25mA 16C76 22 5 8k 368 25mA 16C77 33 8 8k 368 25mA

50. Analogue to Digital Conversion cont… Memory map of the 16C711

51. Analogue to Digital Conversion cont… ADCON0 file register

52. Analogue to Digital Conversion cont… INTCON register for 16C711

55. Example cont… Possible combination of ADCON1 Bit 1 Bit 0 RA0 RA1 RA2 RA3 Ref 0 0 A A A A VDD 0 1 A A A Vref RA3 1 0 A A D D VDD 1 1 D D D D VDD

57. Example 7.5 cont…

58. Example 7.5 cont… Main loop Interrupt Service Routine

59. Example 7.5 cont…

60. Example 7.5 cont…

61. Example 7.5 cont…