Beginners Introduction to the Assembly Language of ATMEL-AVR-Microprocessors
Polprog's AVR assembly crash-course
PDF] Introduction to the AVR Assembly Language free tutorial for Beginners
The AVR Microcontroller and Embedded Systems Using Assembly and C: Using Arduino Uno and Atmel Studio: Naimi, Sepehr, Naimi, Sarmad, Mazidi, Muhammad Ali: 9780997925968: Amazon.com: Books
assembly - AVR assembler arithmetics - how to see the output - Stack Overflow
AVR-ASM-Software-UART/software_uart.asm at master · sirgal/AVR-ASM-Software-UART · GitHub
Gerd's AVR simulator
avr - What are the addresses of r10 and r20 in this assembly code? - Stack Overflow