PIC interrupt

I need to create an interrupt with a PIC microcontroller so that when a pin is "high" the controller will stop what it is doing and do something else. How do I code this? Thanks for any help

 

use the rb0 interrupt, see the data sheet.

 

Which compiler and programming language are you using?

 

as you know this is the pic16f876A i wrote the code for it and that is the chip



you have just 1 external interrupt at pin RB0 in port B with yellow
the code is for when applying high on RB0 it make an interrupt and go to execute it and return again to the main pragram

Code ( (Unknown Language)):

1.  
2.     LIST P=16F876
3.     #INCLUDE<P16F876.INC>
4.     __CONFIG    _CP_OFF&_LVP_OFF&_BODEN_OFF&_PWRTE_ON&_WDT_OFF&_XT_OSC
5.     ORG 0X00
6.     GOTO INTIATION
7.     ORG 0X04
8. ;INTERRUPT SUBRUTINE
9.     NOP                              ;any thing you want
10.     BCF INTCON,INTF        ;STOP THE INTERRUPT
11.     RETFIE
12. INTIATION
13. ;INTERRUPT INTIATION
14.     MOVLW 0X90
15.     MOVWF INTCON           ;Enable External Interrupt & Enable Global Interrupt Gate
16.     MOVLW 0X47
17.     MOVWF OPTION_REG  ;Intrrupt Start At Falling Edge
18. ;INTIATION PORTS
19.     MOVLW 0X01
20.     TRIS PORTB
21. START
22. NOP                                                 ;the main program
23. GOTO START
24. END
25.  

from the code we know that i used the instruction RETFIE
which mean that i want return to the exact place i was in before executing the interrupt
but if want to goto any where else you can ignore using this instruction and just write instead

Code ( (Unknown Language)):

1.  
2. BSF INTCON,GIE          ;ALLOW OTHER INTERRUPT TO BE ABLE OCCUR
3. GOTO HELL                 ;joking :) , you can chose any place you want
4.  

note that it is the same for
pic16f876
pic16f876a
pic16f873
pic16f873a
thats all
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