xbz.asm

基于UCM40的超声波测距函数,可测0.08---2.5米距离,数值精确

VOUT	EQU	P1.0;
;中断人口；
ORG	0000H
	LJMP	START
ORG	0003H
	LJMP	PINT0
ORG	000BH
	LJMP	ONTT0
ORG	0013H	
	RETI
ORG	001BH
	LJMP	INTT1
ORG	0023H
	RETI
ORG	002BH
	RETI

;主程序；

START:	MOV	SP,#4FH
	MOV	R0,#40H
	MOV	R7,#0BH
CLEARDISP: MOV	@R0,#00H
	INC	R0
	DJNZ	R7,CLEARDISP
	MOV	20H,#00H
	MOV	TMOD,#21H
	MOV	TH0,#00H
	MOV	TL0,#00H
 	MOV	TH1,