tc1_ovf.asm

it consist of PCF8583 assembly driver

;----------------------------------------------------------------------------
;                    I N T E R R U P T     P R O G R A M M                   
;----------------------------------------------------------------------------


;------------------------------ Entrance ------------------------------------


TC1_OVF:	;sei			;global INT enable	

		push	r16		;push R16
		in	r16,sreg	;push sreg
		push	r16		;push sreg

		push	r17
		push	r18

;------------------------------	CODE	---------------------------------

		ldi	r16,0xFC		;(FC -optimum)
		out	TCNT1H,r16		; 
		ldi	r16,0x17		;
		out	TCNT1L,r16		;TC1 Start from 0xFC17 (2KHz)
		
		lds	r16,PCF8583_A00	;
		sbrs	r16,1			;
		rjmp	TC12			;Test ALARM 

		sbi	portb,4			;RELE ON
		
		lds	r17,IND_FLAG		;
		tst	r17			;
		brne	TC11			;Get 1/4s pulses
	
		tst	r3			;
		brne	TC11			;Test BEEP flag
		
		ser	r16			;
		mov	r3,r16			;BEEP=1

		sbi	portd,3			;Set PORTD3=1
		rjmp	TC12			;

TC11:		clr	r3			;BEEP=0
		cbi	portd,3			;CLEAR PORTD3=1

TC12:		


;------------------------------ EXIT ---------------------------------------

		pop	r18
		pop	r17
		
		pop	r16		;Pop Rx from STACK
		out	sreg,r16	;Pop sreg
		pop	r16		;pop R16
		
		RETI