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1 Tutorial problem set 1, Q.N. 10 on 17th March 2009, 7:54 pm

diadem59

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Transfer ten data, which has bit D5 and D0, 0 and 1 respectively from 6430H to 6440H, else store 00 instead of transformation. (8085)

Code:

      SOLUTION:

        LXI H,6430H  ;source address
        LXI D,6440H  ;destination address
        MOV C,0AH  ;counter
Re:      MOV A,M    ;gets data
        MOV B,00  ;initialize B with 00
        RRC              ;sends D0 bit to CY
        RLC              ;restore original data, CY flag still holds D0 bit
        JNC skip    ;skips if CY(i.e. D0 bit) is 0
        ANA 20H    ;ANDs D5 bit with 1 and other bits with 0
        JNZ skip    ;skips if not zero(i.e. D5 bit is 1)
        MOV B,M  ;if not skipped, stores the original data in B
Skip:    MOV A,B  ;moves content of B(may be 00 or original data) in A
        STAX D;stores content of A in memory location hold by DE reg. pair
        INX H        ;increases HL reg. pair
        INX D        ;increases DE reg. pair
        DCR C      ;decreases counter
        JNZ re      ;repeats the process ten times
        HLT          ;terminates the program

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