You appear to be confusing 'F' with 'f'. 'F' is a label defined as 1. 'f' is a sombolic reference to any of the file registers. ______________________________ Reply Separator _________________________________ Subject: Something else going on. Ref: Use of W in movfp W,FSR0 Author: BLEGER@MAILB.HARRIS.COM at internet Date: 11/15/96 2:01 PM Looking at the 1995 manual Table 15-2 (PIC 17CXX instruction set) for MOVFP f,p it shows f=0to255 and p=0to31. This is not the 0/1 situation as is for s in clrf f,s. Use of W=0 and F=1 makes sense to me in clrf but not movfp. If f is 0, it would activate indirect addressing using INDF0, right? What do you think is going on with MOVFP W,FSR0 as shown below?