1 .nolist

     2 .include "m168def.inc"      ; Same family as 328P

     3 .list

     4 

     5 ;; Interrupt Vector

     6 .org 0x00

     7         rjmp        init

     8 

     9 .org OC1Aaddr

    10 		; Timer/Counter1 Compare Output A

    11 		rjmp		Timer_OC1A

    12 

    13 .org OC0Aaddr

    14         ; Timer/Counter0 Compare Output A

    15         rjmp        Timer_OC0A

    16 

    17 .org 0x40

    18 

    19 ;; Syntax

    20 .include "macros.inc"

    21 

    22 ;; Timer0 Compare A handler

    23 Tick:

    24 	; Toggle

    25 		sbi			PIND, PORTD7

    26 

    27 		ret

    28 

    29 ;; Timer

    30 .set TIMER0_CB_A = Tick

    31 .include "timer.inc"

    32 

    33 Main:

    34 init:

    35     ; Stack

    36         ldi         r16, high(RAMEND)

    37         ldi         r17, low(RAMEND)

    38         out         SPH, r16

    39         out         SPL, r17

    40 

    41     ; Enable interrupts

    42         sei

    43 

    44 	; Turn off LED7

    45 		sbi			DDRB, PORTB1

    46 		sbi			PORTB, PORTB1

    47 

    48 

    49 	; DEBUG

    50 		sbi			DDRD, PORTD7

    51 		cbi			PORTD, PORTD7

    52 

    53 		sbi			DDRD, PORTD6

    54 		sbi			DDRD, PORTD5

    55 		

    56 

    57     ; Timer

    58 		; setup

    59         rcall       Timer0_Init

    60 		

    61 		; run with 255k cycles

    62 		ldi			r16, 255

    63 		rcall		Timer0_Start	

    64 

    65 loop:

    66 	; Run timer

    67 		rjmp		loop

    68