.INCLUDE "M32DEF.INC"
	LDI	R20,HIGH(RAMEND)	
	OUT	SPH,R20
	LDI	R20,LOW(RAMEND)
	OUT	SPL,R20
	LDI	R20,0xFF		
	OUT	DDRB,R20
	CBI	DDRA,7		
	LDI	R20,0x66		
L1:	OUT	PORTB,R20		
	IN	R16,PINA
	BST	R16,7			
	BRTS	CW
	LSR	R20			
	BRCC	OV1			
	ORI	R20,0x80				
OV1:RCALL	DELAY			
	RJMP	L1			
CW:	LSL	R20			
	BRCC	OV2			
	ORI	R20,0x01				
OV2:RCALL	DELAY			
	RJMP	L1