Hans Stevens <PICLIST@MITVMA.MIT.EDU> wrote:

> On my PIC16C84 project, I use the 4 Interupts .... Now I wonna
> create 4 Interupts vector address.
>
> Example
>         ORG 0X010       ;Ext. Int. Vector Adress
>         .....
>         ....
>
>         ORG 0X020       ;TMR0 Overflow
>
> Have somebody a idea how to do this?

Hans:

The 16F84 has only a single interrupt vector; to handle
multiple interrupt sources, your interrupt service routine
must check each enterrupt flag individually.

For example:

            ORG     0x0004

            MOVWF   INT_W                  ;SAVE W.

            SWAPF   STATUS,W        ;SAVE STATUS.
            MOVWF   INT_S                  ;

            BTFSS   INTF            ;EXTERNAL INTERRUPT?
            GOTO    CHECKT0         ;IF NOT, JUMP AHEAD.

    ; EXTERNAL INTERRUPT IS PENDING.

            BCF     INTF            ;CLEAN UP.

            ; HANDLE EXTERNAL INTERRUPT HERE...

    CHECKT0:

            BTFSS   T0IF            ;TMR0 OVERFLOW INTERRUPT?
            GOTO    CHECKPB         ;IF NOT, JUMP AHEAD.

    ; TMRO-OVERFLOW INTERRUPT IS PENDING.

            BCF     T0IF            ;CLEAN UP.

            ; HANDLE TMR0-OVERFLOW INTERRUPT HERE...

    CHECKPB:

            BTFSS   RBIF            ;PORTB-CHANGE INTERRUPT?

            [etc....]

-Andy


=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
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