Avr Assembler Download Portable ❲Editor's Choice❳

LOOP: ; Turn LED on sbi PORTB, 5 ldi r16, 0xFF call DELAY ; Turn LED off cbi PORTB, 5 ldi r16, 0xFF call DELAY rjmp LOOP

Now assemble it using GNU toolchain:

DELAY: ; Delay loop (approximate) ldi r17, 0xFF L1: ldi r18, 0xFF L2: dec r18 brne L2 dec r17 brne L1 dec r16 brne DELAY ret avr assembler download

AVR Assembler is the lowest level of human-readable code for Atmel (now Microchip) AVR microcontrollers—the brains inside Arduino Uno (ATmega328P), Nano, and many custom boards. While most people use Arduino's C++ environment, learning Assembly gives you absolute control over every clock cycle, every register, and every byte of memory. LOOP: ; Turn LED on sbi PORTB, 5

; Blink LED on PB5 (Arduino Uno pin 13) – ATmega328P .nolist .include "m328pdef.inc" ; Register names .list .org 0x0000 rjmp RESET Turn LED on sbi PORTB