Stopwatch Programming

;Question requirements:
;Stopwatch timing, press S0 to start timing, and the digital tube will display;
;Press S0 again to stop. If S0 is not pressed to stop after counting for 1 minute, the buzzer will alarm.
;To simulate on the proteus software......
;===============================================================================
;The questioner gave a program. After modification, the required functions, except for the buzzer alarm, can be realized.
;The buzzer alarm is difficult to modify from the original program. It is recommended to change it to an LED light alarm.
;The program is as follows:
;----------------------------------------------
TEMP EQU 22H
        ORG 0000H
        SJMP START
        ORG 0003H
        LJMP X0_INT
        ORG 0050H
;----------------------------------------------
START:
        MOV IE, #85H
        MOV IP, #00000001B
        MOV TEMP, #0
;----------------------------------------------
M_LOOP:
        CALL DISPLAY
        CALL DELAY2 ;Delay about 500ms
        CALL DELAY2
        JNB F0, NEXT
        INC TEMP
        MOV A, TEMP
        CJNE A, #61, NEXT
        CLR P0.1
        MOV TEMP, #60
NEXT: 
        SJMP M_LOOP ;One loop, about 1s
;----------------------------------------------
X0_INT:
        CPL F0
        JB P0.1, X0_END
        SETB P0.1
        MOV TEMP, #0
X0_END:        
        ​​JNB P3.2, $
        RETI
;----------------------------------------------
DISPLAY:
        MOV DPTR, #NUMTAB ;Specify table address
        MOV A, TEMP
        MOV B, #10
        DIV AB ;A/B quotient = a, remainder = b
        MOVC A, @A+DPTR ;Check the ten-digit seven-segment code
        MOV P1, A ;Send the ten-digit seven-segment code
        MOV A, B ;The ones digit is in b
        MOVC A, @A+DPTR ;Check the ones digit seven-segment code
        MOV P2, A ;Send the ones digit seven-segment
        RET
;----------------------------------------------
NUMTAB:
        DB 0C0H,0F9H,0A4H,0B0H,099H
        DB 092H,082H,0F8H,080H,090H
;----------------------------------------------
DELAY2: ; Delay about 500ms
        MOV R5, #10     
DEL3: MOV R6, #100
DEL4: MOV R7, #248
        DJNZ R7, $
        DJNZ R6, DEL4
        DJNZ R5, DEL3
        RET
END
;----------------------------------------------
; The program is run with PROTEUS, and the screenshot is as follows: