.include "m8515def.inc" .def temp=r16 .def var=r17 .org $00 rjmp INIT .org $07 rjmp TIMER_OV0_HANDLER DELAY: ldi r18, 1 ldi r19, 0xFF ldi r20, 0xFF CONT: dec r20 brne CONT dec r19 brne CONT dec r18 brne CONT ret INIT: ldi temp, high(RAMEND) out SPH, temp ldi temp, low(RAMEND) out SPL, temp ; Setting PORTA, PORTB ldi temp, 0b11111111 out DDRA, temp ldi temp, 0b11111111 out DDRB, temp ; Setting Timer Interrupt ;ldi temp, 0b00000101 ; 1 << (CS02) = 0b00000001 << 2 = 00000100 ; 1 << (CS00) = 0b00000001 << 0 = 00000001 ldi temp, (1 << CS02) | (1 << CS00) out TCCR0, temp ldi temp, (1 << TOV0) out TIFR, temp ldi temp, (1 << TOIE0) out TIMSK, temp sei ldi var, 0x00 loop: ldi temp, 0b10101010 out PORTA, temp rcall DELAY ldi temp, 0b01010101 out PORTA, temp rcall DELAY rjmp loop TIMER_OV0_HANDLER: ldi temp, 0b11111111 eor var, temp out PORTB, var reti