.INCLUDE "M32DEF.INC"

	LDI R21,0x00				 
	OUT	DDRA,R21				
	LDI R21,0xFF				 
	OUT	PORTA,R21				
	OUT	DDRB,R21				

	LDI	R21,HIGH(RAMEND)		
	OUT	SPH,R21					
	LDI	R21,LOW(RAMEND)			
	OUT	SPL,R21					

	LDI	R16,(1<<TXEN)|(1<<RXEN)	
	OUT	UCSRB, R16				
	LDI	R16,(1<<UCSZ1)|(1<<UCSZ0)|(1<<URSEL) 
	OUT	UCSRC, R16		
	LDI	R16,0x33		
	OUT	UBRRL,R16

	LDI	R17,'Y'			
	CALL TRNSMT			
	LDI	 R17,'E'		
	CALL TRNSMT			
	LDI	 R17,'S'		
	CALL TRNSMT			
AGAIN:	
	SBIS UCSRA,RXC		
	RJMP SKIP_RX		
	IN	 R17,UDR		
	OUT	 PORTB,R17		

SKIP_RX:
	SBIS UCSRA,UDRE		
	RJMP SKIP_TX		
	IN	 R17,PINA		
	OUT	 UDR,R17		
SKIP_TX:
	RJMP AGAIN			

TRNSMT:
	SBIS UCSRA,UDRE		
	RJMP TRNSMT			
	OUT	 UDR,R17		
	RET