Problem with MPLAB

I've successfully written many PIC programmes but this my first time with the 16F684.

I have MPLAB 8.92.

I cannot clear INTCON, 0. This instruction does not anything.
bcf INTCON, 0 ;RBIF

If I use this
clrf INTCON the INTCON value changes from 0x09 to 0x01. I have tried various tricks but to no avail.

I even uninstalled MPLAB & then re-installed it.

This instruction does clear INTCON, 1

bcf INTCON, 1 ;INTF

I feel that there is a software problem with MPLAB as I can't see any reason why it does not clear INTCON, 0

Any assistance will be appreciated.

It is in the datasheet.. The RBIF can only be cleared when PORTB has been read.

Ian Rogers said:

It is in the datasheet.. The RBIF can only be cleared when PORTB has been read.

Code:

ISR
   btfsc   INTCON.0
   goto   notpb
   movfw   PORTB
   bcf    INTCON.0
blah blah

Click to expand...

Thanks Ian,
Yes I recall that now but had forgotten.
Len