Blinking LED using Interrupt on ATTiny13A

Here's the template

.include "../tn13Adef.INC" 

.def a=r16

.org $0000              ; startup vector

    rjmp onReset

.org $0006              ; compare match vector

    rjmp Tim0CompA

onReset:

    sbi DDRB,0          ; port B0 as output

    

    ldi a, 0b10000011   ; pwm mode 3

    out TCCR0A, a

    

    ldi a, 0b00000101   ; divider /1024

    out TCCR0B,a

    

    ldi a, 0b0000100    ; enable compare interrupt

    out TIMSK0,a

    

    sei

main:

    rjmp main

        

Tim0CompA:

    in a, OCR0A

    inc a

    out OCR0A,a

    reti

.

if we set divider to 8

    ldi a, 0b000000010   ; divider /8

    out TCCR0B,a

and edit the timer routine to

Tim0CompA:

    in a, OCR0A

    dec a

    out OCR0A,a

    reti

we'll get smoother PWM respond 

with prescaler 64



prescaler 256



with prescaler 64 and increasing OCR0A