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.include "m8def.inc"

ldi r16, HIGH (RAMEND)
out SPH, r16
ldi r16, LOW (RAMEND)
out SPL, r16

ldi r16, 0xff
out DDRB, r16

ldi r16, 0x00
loop1:
com r16
out PORTB, r16
com r16
rcall sleep
inc r16
rjmp loop1


sleep:
push r16
push r17
push r18
ldi r16, 0x00
sleep_loop1:
ldi r17, 0x00
sleep_loop2:
ldi r18, 0x00
sleep_loop3:
inc r18
cpi r18, 0x0e
brne sleep_loop3
inc r17
cpi r17, 0x10
brne sleep_loop2
inc r16
cpi r16, 0xf0
brne sleep_loop1
pop r18
pop r17
pop r16
ret

Code: Select all

.include "m8def.inc"

.org 0x0000
rjmp RESET
.org OVF0addr
rjmp Timer0addr

RESET:
ldi r16, HIGH (RAMEND)
out SPH, r16
ldi r16, LOW (RAMEND)
out SPL, r16

ldi r16, 0xff
out DDRB, r16

ldi     r16, (1<<CS02) | (1<<CS00)
out     TCCR0, r16
ldi     r16, (1<<TOIE0)
out     TIMSK, r16

ldi r16, 0x00
ldi r17, 0x00

sei

end:
rjmp end

Timer0addr:
inc r16
andi r16, 0b00000011
cpi r16, 0b00000011
breq update
reti
update:
inc r17
com r17
out PORTB, r17
com r17
reti