Ray Gardiner <ray@NETSPACE.NET.AU> wrote:

>>sub_word_literal: macro aaa, lll
>>
>>   movlw   low (~(lll) + 1)
>>   addwf   aaa+1, f
>>   movlw   high ((~(lll) + 1) & h'ffff')
>>   skpnc
>>   addlw   1
>>   skpnc
>>   skpz
>>   addwf   aaa, f
>>   endm

>I haven't got a better version, but a typo has crept into the above code
>the high and low bytes of the address are flipped. ie aaa should be aaa+1
>and vice versa.

Well, it depends.  I usually store high byte - low byte in successive
registers, in which case the macro works.

For example:

   cblock
   tempH
   tempL
   endc

   sub_word_literal tempH, 1234

The first part of the macro subtracts (adds compliment) of the lsb and
the second part subtracts the msb.


>This macro raise two points
>        1. make the assembler/compiler do some of the work
>        2. make the piclist do the debugging. :-)

Amen to both.

--
Bob Fehrenbach    Wauwatosa, WI     bfehrenb@execpc.com