> I am currently looking at Interupts

Paul, if you don't need to use an interrupt then I think it would be
an unnecessary complication at this stage if you're unsure. My
inclination would be to get it done without an interrupt so you've
got (a) the satisfaction and relief of having got something working
and (b) a fall-back point to build on if you want to tackle interrupts

However, it would be quite straight-forward to do this with the
INT0 interrupt

You can also use T0CKI as a counter input (see the Option_Register
and Timer0 sections in the datasheet). If you load TMR0 with "255 -
count" (ie for you, 255 - 50), when 50 pulses have been entered into
T0CKI then TMR0 will increment from 255 (or -1) to 0 and TMR0IF
will be set. You can either poll for this or use it to generate an interrupt

wbr

PS in my /10 code posted the 'loop can be moved one line down as
W hasn't changed

     movlw   0x0a
loop     subwf   temp      ;subtract 10

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