A timing analysis:

> > >movwf   INTCON        ;[1]
> > >andlw   0x07               ;[2]
> > >addwf   PCL               ;[3-4]
> > >goto    test1                ;[5-6]
> > >goto    test2
> > >goto    test3
> > >etc..
> > >etc...

so test1, test2 and test3 all get control after 6 cycles.

With:

    btfsc    INTCON,0      ;[1]
    goto    test1                ;[2-3]
    btfsc    INTCON,1      ;[3-4]
    goto    test2                ;[4-5]
    btfsc    INTCON,2      ;[5-6]
    goto    test3                ;[6-7]

Now test1 gets control after 3 cycles, test 2 after 5 and test3 after 6.

A little quicker for the 'higher priority' interrupt this way.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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