单片机秒表程序

SPK EQU P1.0
T0H EQU 30H
T0L EQU 31H
Time EQU 32H
SER EQU 33H
ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 001BH
LJMP T1ISR
ORG 0030H
MAIN:
	MOV SP,#5FH
	MOV TMOD,#11H
	SETB ET0
	SETB ET1
	SETB EA
	LCALL DELAY
REP:
	MOV SER,#0
	MOV Time,#1
LOOP:
	SETB TR0
	MOV A,SER
	CLR C
	RLC A
	MOV F0,C
	MOV DPTR,#STAB
	ADD A,DPL
	MOV DPL,A
	MOV DPH,A
	ADDC A,#0
	MOV C,F0
	ADDC A,#0
	MOV DPH,A
	CLR A
	MOVC A,@A+DPTR
	MOV R2,A
	CJNE A,#255,LPC
	LJMP REP
LPC:
	INC DPTR
	CLR A
	MOVC A,@A+DPTR
	MOV R3,A
	MOV DPTR,#FREQ
	MOV A,R2
	JNZ LPCC
	CLR TR0
	SJMP LPCCC
LPCC:
	DEC A
	RL A
	PUSH ACC
	MOVC A,@A+DPTR
	MOV T0H,A
	POP ACC
	INC A
	MOVC A,@A+DPTR
	MOV T0L,A
LPCCC:
	MOV Time,R3
	SETB TR1
WAIT:
	MOV A,Time
	JNZ WAIT
	LJMP LOOP
;-----------------------------
T0ISR:
	CLR TR0
	MOV TH0,T0H
	MOV TL0,T0L
	SETB TR0
	CPL SPK
	RETI
;-----------------------------
T1ISR:
	CLR TR1
	MOV TH1,#HIGH(65536-50000)
	MOV TL1,#LOW(65536-50000)
	SETB TR1
	DEC Time
	MOV A,Time
	JNZ T1E
	MOV TH0,T0H
	MOV TL0,T0L
T1E:
	RETI
;-----------------------------
DELAY:
    MOV R2,#100
DLY1:
    MOV R3,#200
DLY2:
    MOV R4,#248
    DJNZ R4,$
    DJNZ R3,DLY2
    DJNZ R2,DLY1
    RET
;-----------------------------
STAB:
	DB 10,10,9,10,10,10,11,10,12,40,8,10,7,10,8,10,9,10,10,40
	DB 6,10,8,10,7,10,8,10,5,10,8,10,9,10,8,10,7,10,8,10,8,40
	DB 10,10,9,10,10,10,11,10,12,40,8,10,7,10,8,10,9,10,10,20,10,10,5,10
	DB 6,30,8,10,8,30,5,10,4,10,6,10,7,10,8,10,10,10,11,10,9,20
	DB 10,10,9,10,10,10,11,10,12,40,8,10,7,10,8,10,9,10,10,20,10,10,5,10
	DB 6,10,8,10,0,10,5,5,3,5,4,10,8,10,8,10,6,10,7,10,7,10,7,10,8,10,9,40
	DB 0,30,5,10,12,30,11,10,10,20,10,10,14,10,15,30,14,10
	DB 15,10,14,10,12,10,8,10,8,30,13,10,13,20,11,10,6,10,7,10,7,10,7,10,8,10
	DB 9,30,5,10,12,30,11,10,10,10,10,10,10,10,14,10,15,30,14,10
	DB 15,10,14,10,12,10,8,10,8,30,13,10,13,20,11,10,6,10,7,10,7,10,7,10,8,20,8,20,255
;-----------------------------
FREQ:
	DB 0F2H,03DH	;1低音1
	DB 0F3H,0BDH	;2低音2
	DB 0F5H,014H	;3低音3
	DB 0F5H,0B1H	;4低音4
	DB 0F6H,0D0H	;5低音5
	DB 0F7H,0D1H	;6低音6
	DB 0F8H,0B5H	;7低音7

	DB 0F9H,01EH	;8中音1
	DB 0F9H,0DEH	;9中音2
	DB 0FAH,08AH	;10中音3
	DB 0FAH,0D8H	;11中音4
	DB 0FBH,068H	;12中音5
	DB 0FBH,0E8H	;13中音6
	DB 0FCH,05AH	;14中音7
 
	DB 0FCH,08FH	;15高音1
	DB 0FCH,0EFH	;16高音2
	DB 0FDH,045H	;17高音3
	DB 0FDH,06CH	;18高音4
	DB 0FDH,0B4H	;19高音5
	DB 0FDH,0F4H	;20高音6
	DB 0FEH,029H	;21高音7
;-----------------------------
	END