MAX187:
CLR		P1.6						
CLR		P1.5						
SETB	P1.7						
LOOP0:
MOV	C,P1.7					
JNC		LOOP0
SETB	P1.6						
MOV	R7,#04H					
CLR		A
LOOP1:
CLR		P1.6
NOP
SETB	P1.6
MOV	C,P1.7
RLC		A
DJNZ	R7,LOOP1
MOV	B,A
MOV	R7,#08H					
CLR		A
LOOP2:
CLR		P1.6
NOP
SETB	P1.6
MOV	C,P1.7
RLC		A
DJNZ	R7,LOOP2
SETB	P1.5
MOV	20H,A					
MOV	21H,B					
RET