noname1.asm

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MH EQU 30H
ML EQU 31H
SH EQU 32H
SL EQU 33H

ORG 0000H
LJMP START
ORG 0003H
RETI
ORG 000BH
LJMP TOS
ORG 0013H
RETI
ORG 001BH
RETI
ORG 0023H
RETI

CLEAR: MOV SL, #00H
       MOV SH, #00H
       MOV ML, #00H
       MOV MH, #09H
       MOV R0, #2FH
       CLR P3.5
       CLR P3.4
       RET

WELCOME: MOV P1, #0FH
         RET
START: ACALL CLEAR
       AJMP START


MAIN:  LCALL KEYWORK
       CJNE R0, #30H, NEXT0
       LCALL SHOW3
NEXT0: CJNE R0, #31H, NEXT1
       LCALL SHOW2
NEXT1: CJNE R0, #32H, NEXT2
       LCALL SHOW1
NEXT2: CJNE R0, #32H, MAIN
       LCALL SHOW0
       AJMP MAIN

KEYWORK: MOV P3, #0FFH
         LCALL DELAY3
         JNB P3.0, KEY0
         LCALL DELAY3
         JNB P3.1, KEY1
         RET
KEY0: INC R0
      CJNE R0, #34H, OUT
      AJMP RUN
OUT:  RET
KEY1: INC @R0
      RET

RUN:  AJMP TIMER
      SETB P1.0

TIMER: MOV SP, #6FH
       MOV TMOD, #01H
       MOV TH0, #3CH
       MOV TL0, #0C2H
       MOV IE, #82H
       MOV R2, #00H
       SETB TR0

LOOP0: MOV R3, SL
       CJNE R3, #00H, OUT0
       MOV R3, SH
       CJNE R3, #00H, OUT1
       MOV R3, ML
       CJNE R3, #00H, OUT2
       MOV R3, MH
       CJNE R3, #00H, OUT3
       LCALL BEEP
OUT0:  SJMP LOOP0
OUT1:  MOV SL, #0AH
       DEC SH
LOOP1: MOV R3, SL
       CJNE R3, #0AH, DISPLAY
       SJMP LOOP1
DISPLAY: SJMP LOOP0
OUT2:   MOV SH, #06H
        DEC ML
        SJMP LOOP0
OUT3:  MOV ML, #0AH
       DEC MH
       SJMP LOOP0
TOS:   PUSH PSW
       PUSH ACC
       INC R2
       CJNE R2, #06H, NEX
       SETB P1.4
NEX:   CJNE R2, #14H, NEXT
       MOV R2, #00H
       INC R4
       PUSH PSW
       PUSH ACC
       POP ACC
       POP PSW
       DEC SL
       LCALL SHOW0
NEXT:  MOV TH0, #3CH
       MOV TL0, #0C2H
       POP ACC
       POP PSW
       RETI
SHOW0: MOV A, SL
       ORL A, #0E0H
       MOV P1, A
       RET
SHOW1: MOV A, SH
       ORL A, #0D0H
       MOV P1, A
       RET
SHOW2: SETB P1.5
       MOV A, ML
       ORL A, #0B0H
       MOV P1, A
       RET
SHOW3: SETB P1.6
       MOV A, MH
       ORL A, #70H
       MOV P1, A
       RET
BEEP:  SETB P3.7
       CLR TR0
       RET


DELAY0: NOP
        NOP
        RET

DELAY1: ACALL DELAY0
        DJNZ R1, DELAY1
        MOV R1, #0FFH
        RET

DELAY2: ACALL DELAY1
        DJNZ R4, DELAY2
        RET

DELAY3: MOV R1, #0FFH
        MOV R4, #0FFH
        ACALL DELAY2
        RET


END