10 GPR - General Purpose Registers
The AVR32/16DD14/20 devices provide four
General Purpose registers. These registers can be used for storing any information, and
they are particularly useful for storing global variables and interrupt flags. General
Purpose registers, which reside in the address range 0x1C-0x1F, are directly
bit-accessible using the SBI
, CBI
,
SBIS
, and SBIC
instructions.