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under Routines, Conditionals

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James Newton (PICList Admin #3)
mailto:jamesnewton@piclist.com 1-619-652-0593
PIC/PICList FAQ: http://www.piclist.com or .org

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of John Albers
Sent: Tuesday, April 18, 2000 12:18
To: PICLIST@MITVMA.MIT.EDU
Subject: Interpreting C and Z flags when doing comparisons ???


I am working with PIC16F84 chips.  I was wondering what the best way was to
compare a file register to a number and to compare a file register to
another file register.  This is what I have come up with.  Could someone
please check the validity of the following statements?

Compare a file register to a number.  For example to compare COUNT to the
number 12.

movf     COUNT,w
sublw   d'12'


COUNT < 12    , if   C flag <> Z flag
COUNT = 12    , if   Z flag = 1
COUNT <= 12  , if   C flag = 1
COUNT > 12    , if   C flag = 0
COUNT >= 12  , if   C flag = Z flag

What is the best way to check [C flag <> Z Flag] and [C flag =  Z Flag]

Compare two file registers to each other.  For example to compare COUNT1 to
COUNT2.

movf     COUNT1,w
subwf   COUNT2,w

COUNT1 <   COUNT2 ,if  C flag <> Z flag
COUNT1 =   COUNT2 ,if  Z flag = 1
COUNT1 <= COUNT2 ,if  C flag = 1
COUNT1 >   COUNT2 ,if  C flag = 0
COUNT1 >= COUNT2 ,if  C flag = Z flag

Any help would be greatly appreciated.  Thank You.