BUF     EQU  30H
SECBUF  EQU  21H
MINBUF  EQU  22H
HOURBUF EQU  23H
C_8279  EQU  0B001H
D_8279  EQU  0B000H
        ;
        ORG 0000H
        LJMP START
        ;
        ORG 000BH
        LJMP CLOCK
        ;
        ORG 0030H
START:  MOV SP,#50H
        MOV DPTR,#C_8279
        MOV A,#0DFH
        MOVX @DPTR,A
        MOV R6,#0FFH
        DJNZ R6,$
        ;
        MOV A,#00H
        MOVX @DPTR,A
        MOV A,#32H
        MOVX @DPTR,A
        ;
        ANL TMOD,#0F0H
        ORL TMOD,#01H
        MOV TL0,#78H
        MOV TH0,#0ECH
        ;
        MOV BUF,#00H
        MOV SECBUF,#30H
        MOV MINBUF,#59H
        MOV HOURBUF,#23H
        ;
        SETB TR0
        SETB ET0
        SETB EA
        ;
LP1:    ACALL FLASH
        ;
        MOV DPTR,#C_8279
        MOVX A,@DPTR
        ANL A,#07H
        CJNE A,#00H,DO_KEY
        SJMP LP1
        ;
DO_KEY: MOV DPTR,#D_8279
        MOVX A,@DPTR

	MOV B,A
	MOV R1,#00H
	MOV DPTR,#KEYTAB
HA7S5:  MOV A,#00H
	MOVC A,@A+DPTR
	CJNE A,B,HA7S6
	AJMP HA7SA
HA7S6:	INC DPTR
	INC R1
        CJNE R1,#06H,HA7S5
	AJMP LP1

HA7SA:  CJNE R1,#00H,SK1
        MOV A,SECBUF
        ADD A,#01H
        DA A
        CJNE A,#60H,SK2
        MOV A,#00H
SK2:    MOV SECBUF,A
        SJMP KEY_DONE
        ;
SK1:    CJNE R1,#01H,SK3
        MOV A,SECBUF
        ADD A,#99H
        DA A
        CJNE A,#99H,SK4
        MOV A,#59H
SK4:    MOV SECBUF,A
        MOV BUF,#00H
        SJMP KEY_DONE
        ;
SK3:    CJNE R1,#02H,SK5
        MOV A,MINBUF
        ADD A,#01H
        DA A
        CJNE A,#60H,SK6
        MOV A,#00H
SK6:    MOV MINBUF,A
        SJMP KEY_DONE
        ;
SK5:    CJNE R1,#03H,SK8
        MOV A,MINBUF
        ADD A,#99H
        DA A
        CJNE A,#99H,SK7
        MOV A,#59H
SK7:    MOV MINBUF,A
        SJMP KEY_DONE
        ;
SK8:    CJNE R1,#04H,SK10
        MOV A,HOURBUF
        ADD A,#01H
        DA A
        CJNE A,#24H,SK9
        MOV A,#00H
SK9:    MOV HOURBUF,A
        SJMP KEY_DONE
        ;
SK10:   CJNE R1,#05H,KEY_DONE
        MOV A,HOURBUF
        ADD A,#99H
        DA A
        CJNE A,#99H,SK11
        MOV A,#23H
SK11:   MOV HOURBUF,A

KEY_DONE:AJMP LP1
        ;
FLASH:  MOV P2,#0B0H
        MOV R0,#01H
        MOV A,#90H
        MOVX @R0,A
        ;
        MOV DPTR,#SEG_TAB
        MOV P2,#0B0H
        MOV R0,#00H
        MOV A,HOURBUF
        ANL A,#0F0H
        SWAP A
        MOVC A,@A+DPTR
        MOVX @R0,A
        MOV A,HOURBUF
        ANL A,#0FH
        MOVC A,@A+DPTR
        MOVX @R0,A
        ;
        MOV A,MINBUF
        ANL A,#0F0H
        SWAP A
        MOVC A,@A+DPTR
        MOVX @R0,A
        MOV A,MINBUF
        ANL A,#0FH
        MOVC A,@A+DPTR
        MOVX @R0,A
        ;
        MOV A,SECBUF
        ANL A,#0F0H
        SWAP A
        MOVC A,@A+DPTR
        MOVX @R0,A
        MOV A,SECBUF
        ANL A,#0FH
        MOVC A,@A+DPTR
        MOVX @R0,A
        ;
        MOV A,BUF
        ANL A,#0F0H
        SWAP A
        MOVC A,@A+DPTR
        MOVX @R0,A
        MOV A,BUF
        ANL A,#0FH
        MOVC A,@A+DPTR
        MOVX @R0,A
        RET
        ;
CLOCK:  MOV TL0,#78H
        MOV TH0,#0ECH
        PUSH PSW
        PUSH ACC
        ;
        MOV A,BUF
        ADD A,#01H
        DA  A
        MOV BUF,A
        CJNE A,#99H,INT_DONE
        ;
        MOV BUF,#00H
        MOV A,SECBUF
        ADD A,#01H
        DA A
        MOV SECBUF,A
        ;
        CJNE A,#60H,INT_DONE
        MOV SECBUF,#00H
        ;
        MOV A,MINBUF
        ADD A,#01H
        DA A
        MOV MINBUF,A
        ;
        CJNE A,#60H,INT_DONE
        MOV MINBUF,#00H
        ;
        ;
        MOV A,HOURBUF
        ADD A,#01H
        DA A
        MOV HOURBUF,A
        ;
        CJNE A,#24H,INT_DONE
        MOV HOURBUF,#00H
        
INT_DONE:POP ACC
        POP PSW
        RETI
        ;
KEYTAB: DB 0C1H,0C8H,0C9H,0D0H,0D8H,0E0H,0C2H,0CAH,0D1H,0D9H
	DB 0DAH,0C3H,0CBH,0D2H,0D3H,0DBH
KEYTAB1:DB 0E3H,0E2H,0E1H

SEG_TAB:DB 0CH,9FH,4AH,0BH,99H,29H,28H,8FH,08H,09H,88H,38H
	DB 6CH,1AH,68H,0E8H
        END