定时器.asm

刚学时编的小程序

/*--------定时器0计从0到9-------------------
		ORG 0000H
		LJMP MAIN
		ORG 000BH
		LJMP TT0
		ORG 0030H
MAIN:	MOV SP,#60H
		MOV R3,#00
		MOV R4,#00
		MOV A,R4
		MOVC A,@A+DPTR
		MOV P2,A
		MOV DPTR,#TABLE
		MOV TMOD,#01H
		MOV TH0,#(65536-50000) / 256
		MOV TL0,#(65536-50000) MOD 256
		SETB EA
		SETB ET0
		SETB TR0
		SJMP $

TT0:	MOV TH0,#(65536-50000) / 256
		MOV TL0,#(65536-50000) MOD 256
		INC R3
		CJNE R3,#20,LOOP1
		MOV R3,#00
		INC R4
		CJNE R4,#10,LOOP2
		MOV R4,#00
LOOP2:	MOV A,R4
		MOVC A,@A+DPTR
		MOV P2,A
LOOP1:	RETI

TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
		
		END 
;------------------------------------*/

/*------------------------------------------
SECOND EQU 30H
TCOUNT EQU 31H
ORG 00H
LJMP START
ORG 0BH
LJMP INT0X
START: MOV SECOND,#00H
MOV A,SECOND
MOV B,#10
DIV AB
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P1,A
MOV A,B
MOVC A,@A+DPTR
MOV P2,A
MOV TCOUNT,#00H
MOV TMOD,#01H
MOV TH0,#(65536-50000) / 256
MOV TL0,#(65536-50000) MOD 256
SETB TR0
SETB ET0
SETB EA
SJMP $
INT0X:
MOV TH0,#(65536-50000) / 256
MOV TL0,#(65536-50000) MOD 256
INC TCOUNT
MOV A,TCOUNT
CJNE A,#20,NEXT
MOV TCOUNT,#00H
INC SECOND
MOV A,SECOND
CJNE A,#60,NEX
MOV SECOND,#00H
NEX: MOV A,SECOND
MOV B,#10
DIV AB
MOV DPTR,#TABLE
MOVC A,@A+DPTR
MOV P1,A
MOV A,B
MOVC A,@A+DPTR
MOV P2,A
NEXT: RETI

TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
END
;------------------------------------*/

;----------0.2秒闪动----------------------
		ORG 0000H
		LJMP MAIN
		ORG 000BH
		LJMP T0X
MAIN:	MOV SP,#60H
		MOV R0,#00
		MOV R1,#00
		MOV R2,#00
		CLR P1.0
		MOV TMOD,#01H
		MOV TH0,#(65536-50000) / 256
		MOV TL0,#(65536-50000) MOD 256
		SETB EA
		SETB ET0
		SETB TR0
		SJMP $

T0X:	
		MOV TH0,#(65536-50000) / 256
		MOV TL0,#(65536-50000) MOD 256
		INC R0
		CJNE R0,#4,LOOP1
		MOV R0,#00
		INC R2
		CJNE R2,#10,LOOP2
		MOV R2,#00
		INC R1
		CJNE R1,#4,LOOP2
		MOV R1,#00
LOOP2:	CJNE R1,#0,LP1
		CPL P1.0
		JMP LOOP1
LP1:	CJNE R1,#1,LP2
		CPL P1.1
		JMP LOOP1
LP2:	CJNE R1,#2,LP3
		CPL P1.2
		JMP LOOP1
LP3:	CJNE R1,#3,LOOP1
		CPL P1.3
		JMP LOOP1
LOOP1:	RETI
;------------------------------------*/