All GPIO registers refer to 32 pins per port. Depending on the package type, not all pins are available, and the corresponding bits in the GPIO registers are reserved (see GPIO GPIO pins available ).
|Package||GPIO Port 0|
|DIP8||PIO0_0 to PIO0_5|
|TSSOP16/XSON16||PIO0_0 to PIO0_13|
|TSSOP20||PIO0_0 to PIO0_17|
|SOP20||PIO0_0 to PIO0_17|
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