152
8331B–AVR–03/12
Atmel AVR XMEGA AU
13.11 Multi-pin configuration
The multi-pin configuration function is used to configure multiple port pins using a single write
operation to only one of the port pin configuration registers. A mask register decides which port
pin is configured when one port pin register is written, while avoiding several pins being written
the same way during identical write operations.
13.12 Virtual Ports
Virtual port registers allow the port registers to be mapped virtually in the bit-
accessible
I/O
memory space. When this is done, writing to the virtual port register will be the same as writing
to the real port register. This enables the use of I/O memory-specific instructions, such as bit-
manipulation instructions, on a port register that normally resides in the extended I/O memory
space. There are four virtual ports, and so four ports can be mapped at the same time.
