定时器中断控制数码管实验.txt

单片机的源程序

ORG	0000H
AJMP	MAIN
ORG	000BH
AJMP	CT0
MAIN:
MOV P0,#00H
MOV	TMOD,#01H
MOV	TL0,#3CH
MOV	TH0,#0B0H
MOV	IE,#82H
SETB	TR0
MOV	R1,#20
HERE:
SJMP	HERE
CT0:
DJNZ	R1,NEXT
CPL	P2.0
CPL	P2.1
CPL	P2.2
CPL	P2.3
CPL	P2.4
CPL	P2.5
CPL	P2.6
CPL	P2.7
MOV	R1,#20
NEXT:
MOV	TL0,#0B0H
MOV	TH0,#3CH
RETI
END