7 References

1. ATmega4808/4809 Data Sheet
2. MPLAB® XC Compilers
3. AVR Libc Library Reference
4. AVR® Devices in MPLAB® XC8
5. MPLAB® XC8 C Compiler User’s Guide for AVR® MCU
6. Fundamentals of the C Programming Language
7. Fundamentals of C Programming - Enumerations