ex5105.asm

DVCC-jh+ c51单片机试验操作程序源代码（键盘实验 二极管等）

H_TIME  EQU 03CH
L_TIME  EQU 0B0H
        ;
        ORG 0000H
        LJMP START
        ;
        ORG 000BH
        LJMP T0_INT
        ;
        ORG 0030H
START:  MOV R0,#0AH
        MOV R1,#0
        ANL TMOD,#0F0H
        ORL TMOD,#01H
        MOV TH0,#H_TIME
        MOV TL0,#L_TIME
        ORL IE,#82H
        SETB TR0
        MOV DPTR,#D_TAB
LP1:    MOV A,R1
        MOVC A,@A+DPTR
        MOV P1,A
        CJNE R0,#0,LP1
        MOV R0,#0AH
        INC R1
        CJNE R1,#8,SK1
        MOV R1,#0
        mov r0,#0AH
SK1:    SJMP LP1
        ;
T0_INT: CLR TR0
        DEC R0
        MOV TH0,#H_TIME
        MOV TL0,#L_TIME
        SETB TR0
        RETI
D_TAB:  DB 03H,0CH,30H,0C0H
        DB 0FH,0F0H,0FFH,00H
        END