MEAM.Design - ATmega32 Programming - Programming Registers
The following guides are extracted from the ATmega32U4 Detailed Datasheet.
In each case register names are shown in GREEN CAPS and the bit names within the registers are shown in PURPLE CAPS.
Register names and bit names are defined in the header file which can be found in your include path include/avr/iom32u4.h
which is part of your program when you add the line:
#include <avr/io.h>
Below is a sample register and bit description from the ATmega32U4 Datasheet.
The annotations indicate how the guides extract the information and summarize them.
Detailed References