;Принимает через UART число, отправляет его на PORTC
;По внешнему прерыванию 1 сбрасывает значение

.include "8535def.inc"

.def status=r0
.def led1=r16
.def led2=r17  
.def led3=r18
.def led4=r19
.def temp=r20
.def cnt1=r21
.def cnt2=r22
;******************************************************************
.org 0
	rjmp	reset	;RESET handler
	reti			;
.org INT1addr		;External Interrupt1 handler
	rjmp	intr1	;
	reti			;
.org URXCaddr	
	rjmp	COMint	;
	reti			;

intr1:
	in	status, SREG	;	
	cli			;global interrupt disable
	ldi	led1, $04	;
	out	PORTC, led1	;
	ldi	led2, $00	;
	sei			;
	out	SREG, status	;
reti	

COMint:
	in	status, SREG	;
	cli			;
	in	led2, UDR	;
	out	PORTC, led2	;
	sei			;
	out	SREG, status	;
reti

reset:
	ldi	led1,low(RAMEND)    ;$DF
	out	SPL,led1
	ldi	led1,high(RAMEND)    ;$DF
	out	SPH,led1

	ldi	led1,$FF
	out	DDRC,led1       ; set portb as outputs

	ldi	temp, 0b10000000;
	out	GIMSK, temp	;external int1 enable

	ldi	temp, 0b00000000;int1 on falling edge
	out	MCUCR, temp	;

	ldi	temp, 51	;configure baud rate 9600
	out	UBRR, temp	;
	ldi	temp, 0b10011000;configure UART
	out	UCR, temp	;

	ldi	temp, $000000010;
	out	DDRD, temp	;configure PORTD

	sei			;
loop:
	rjmp	loop		;
ret