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error in execution

cev par

in the below code mov A,80h does not work correctly.There seems to be 0FFh in 80h but
mov A,80h makes A=0;

        MOV     P0,#00H  ; P0=0
        MOV     P1,#01H  ;      P1=1
PLOOP1:
;       CALL    DELAY

PLOOP2:
        MOV     A,P1
        CJNE    A,#0,PLOOP2
PLOOP3:
        MOV     A,P1
        CJNE    A,#1,PLOOP3

        MOV     A,80H
        MOV     A,0A0H
        MOV     A,0A1H
        MOV     A,0A2H
        MOV     A,0A3H
        MOV     A,P0
        CPL     A
        MOV     P0,A
        JMP     PLOOP1

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  • 0 in reply to cev par

    Yes, lots of people think their problem is caused by a compiler bug, because if it is a compiler bug then it is someone elses fault.

    By the way - exactly how would the compiler even be involved in this?

    And didn't you get enough of a hint from Hans-Bernhards answer to think a bit more about the problem? Exactly what does that source line mean?

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  • 0 in reply to cev par

    Yes, lots of people think their problem is caused by a compiler bug, because if it is a compiler bug then it is someone elses fault.

    By the way - exactly how would the compiler even be involved in this?

    And didn't you get enough of a hint from Hans-Bernhards answer to think a bit more about the problem? Exactly what does that source line mean?

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