Example C code for the same blink:
DELAY: ldi R20, 0xFF L1: ldi R21, 0xFF L2: dec R21 brne L2 dec R20 brne L1 dec R17 brne DELAY ret Build → Build Solution (F7). Then Debug → Start Debugging (Alt+F5). Use the I/O View to watch PORTB toggle in the simulator. Step 4: Program Hardware Connect STK500 → Tools → Program AVR → Auto Verify → Flash. avr+studio+419+hot
#include <avr/io.h> #include <util/delay.h> int main(void) DDRB = 0xFF; while (1) PORTB ^= 0xFF; _delay_ms(500); Example C code for the same blink: DELAY:
RESET: ldi R16, 0xFF out DDRB, R16 ; Port B as output ldi R18, 0x00 Step 4: Program Hardware Connect STK500 → Tools
Released in the late 2000s, AVR Studio 4.19 was the last of the 4.x series before Atmel transitioned to Atmel Studio 5 (based on Microsoft Visual Studio shell). For low-resource computers, pure assembly coding, or maintaining legacy projects, version 4.19 remains a "hot" choice.