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led dot matrix message display

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nfadzilah

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led dot matrix project

i've to do project about led dot matrix message display..for my project. i'm using pic16f877a and coding using assembly language..

i've got the source code but ive some problem to understand it..can someone help me to understand the assembly language..

ABJADA MOVLW D'10'
MOVWF D3
MOVLW D'25'
MOVWF D2
MOVLW D'25'
MOVWF D1
DECF D1
CALL CHARA
BTFSC STATUS,2
GOTO $-3
DECFSZ D2
GOTO $-7
DECFSZ D3
GOTO $-H'0B'
GOTO NEXT

what does goto $-3 means??
 

dot matrix display project

goto $-3 means that control will be transferred to the 3rd instruction before the current position
 

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