odliczanie

    .org 0x00
    .nolist
    .include "m16def.inc"
    .list

    ldi R20,0xFF
    out DDRA,R20
    out PORTA,R20

    ldi R20,high(RAMEND)
    out SPH,R20
    ldi R20,low(RAMEND)
    out SPL,R20

    ldi R16,0b11110110 ;9
    call OP
    ldi R16,0b11111110 ;8
    call OP
    ldi R16,0b11100000 ;7
    call OP
    ldi R16,0b10111110 ;6
    call OP
    ldi R16,0b10110110 ;5
    call OP
    ldi R16,0b01100110 ;4
    call OP
    ldi R16,0b11110010 ;3
    call OP
    ldi R16,0b11011010 ;2
    call OP
    ldi R16,0b01100000 ;1
    call OP
    ldi R16,0b11111100 ;0
    out PORTA,R16
END:
    jmp END

OP: out PORTA,R16
    ldi R23,21
O3: ldi R22,248
O2: ldi R21,255
O1: dec R21
    brne O1
    dec R22
    brne O2
    dec R23
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    brne O3
    nop
    nop
    nop
    nop
    ret