21.8 PORT Pin Groups and Register Repetition
Tip: The I/O pins are
assembled in pin groups (”PORT groups”) with up to 32 pins. Group 0 consists of the
PA pins, group 1 is for the PB pins, etc. Each pin group has its own PORT registers,
with a 0x80 address spacing. For example, the register address offset for the Data
Direction (DIR) register for group 0 (PA00 to PA31) is 0x00, and the register
address offset for the DIR register for group 1 (PB00 to PB31) is 0x80.