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copare gprs

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wejos

Member
guys is there a way i could compare two GPRs? the "AND" command drive me crazy can't make it to work since i don't know what to do next. i'm lost.

i tried something like:

A equ 0x0C

movlw 0x61 ;t in ascii
andlw 0x74 ;a in ascii
movwf A



since W was 0x61, the value of A would be 0x60 or

01100001 ----61
01110100 ----74
01100000 ----60

if W was 0x74, the value of A would be 0x74 also or

01110100 ----74
01110100 ----74
01110100 ----74


what i want to happen is compare two GPR, if both are the same, then i can set portA, 0x00 to high.
 
Last edited:

gaspode42

Member
This may be the case however you have the incorrect instruction -
try ANDLW not ADDLW. You could also XOR the two values and then check the result (should be zero).
 
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gaspode42

Member
I was editing while you posted, did you get the XOR idea?
 

wejos

Member
not yet gaspode i'll google about XOR. thank you gaspode and nigel. i'll look for the instruction set of my pic AGAIN lols.
 

wejos

Member
thank you gaspode very helpful reference

"A lie gets halfway around the world before the truth has a chance to get its pants on"

lols
 

wejos

Member
guys again thank you it worked. gaspode ty for suggesting xor. nigel for your tut, learned a lot from you.
 
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