>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of Anand Gadiyar
>Sent: 26 February 2007 12:38
>To: PICList
>Subject: [PIC] : SWAPF Instruction's strange behavior
>
>
>Hi all,
>
>   I've been playing around with a PIC 16F877A now. I'm a 
>newbie. I seem to have found strange behavior while using the 
>SWAPF instruction.
>
>Here's the code I tried in MPLAB SIM.
>
>MOVLW 0x4F
>SWAPF W,0
>
>This code seems to be zeroing out the W register instead of 
>exchanging the nibbles like it's meant to. I had to work 
>around it by writing the word to a temporary register and 
>swapping it like this:

The clue is the 'F' in the mnemonic name; SWAPF means swap the nibbles in a FILE register.  You can not specifify W as a register to work on, only as a destination for the result.

Regards

Mike

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