sy21.asm

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        ORG 0000H
        LJMP T0START
        ORG 000BH
        LJMP T0INT
        ORG 1100H
T0START:MOV SP,#5FH
        MOV DPTR,#0E100H
        MOV A,#03H
        MOVX @DPTR,A
        MOV TMOD,#01H
        MOV TH0,#3CH
        MOV TL0,#0B0H
        MOV IE,#82H
        SETB TR0
        SJMP $
T0INT:  JB F0,T0LP1
        SETB F0
        MOV A,#40H
        SJMP T0LP2
T0LP1:  CLR F0
        MOV A,#00H
T0LP2:  MOV DPTR,#0E102H
        MOVX @DPTR,A
        RETI