Assemply Program On Atm89C51

I wrote this Program To Count Fro 0 to 9 On 7-seg

ORG 0H
MOV A, #0H
MOV P2, A
ACALL DELAY
main : INC A
MOV P2, A
ACALL DELAY
CJNE A, #9H, main
MOV R4, #2
DELAY : MOV R3, #220
HERE : NOP
NOP
NOP
NOP
NOP
DJNZ R3, HERE
DJNZ R4, DELAY
RET
END

I will connect BCD To 7-seg to pins 0 : 3 .. It works Fine but i dont know why it stops and freeze on ZERO after counting twice from 0 to 9 ??? Offcourse this on simulation program Protus ,, i didnt made it practically yet >>>> can sm 1 tell me why it freez after Counting twice from 0 to 9 ?>??

Because you are not resetting 'A' to zero on the second pass you never get back to 9


Cheers Ian

SORRY ,, I tried it gives the same result

Are you sure! I've just tried it in proteus and its working!!

Cheers Ian

There is no instuction called ''GOTO''' in assemply ,, Keil gives me error , so i deleted it and it gave the same result

Yes! sorry about that! it's" JMP main " not goto (pic on the brain ) Another thing.. if you want '0' place the INC A after writing to port 2. the delay needs to be a bit slower as well start with R4 = 0.

cheers Ian

P.S. I edited the code again

Thanks man ,, You were a great HeLP,, It worked ,, THQ