PDR=0, ASEL=0, PIDR=0, NCODR=0, PODR=0, ISEL=0, PMR=0, PCR=0, EOFR=00
Port 201 Pin Function Select Register
| PODR | Port Output Data 0 (0): Output low 1 (1): Output high |
| PIDR | Port State 0 (0): Low level 1 (1): High level |
| PDR | Port Direction 0 (0): Input (functions as an input pin) 1 (1): Output (functions as an output pin) |
| PCR | Pull-up Control 0 (0): Disable input pull-up 1 (1): Enable input pull-up |
| NCODR | N-Channel Open-Drain Control 0 (0): Output CMOS 1 (1): Output NMOS open-drain |
| EOFR | Event on Falling/Event on Rising 0 (00): Don’t care 1 (01): Detect rising edge 2 (10): Detect falling edge 3 (11): Detect both edges |
| ISEL | IRQ Input Enable 0 (0): Do not use as IRQn input pin 1 (1): Use as IRQn input pin |
| ASEL | Analog Input Enable 0 (0): Do not use as analog pin 1 (1): Use as analog pin |
| PMR | Port Mode Control 0 (0): Use as general I/O pin 1 (1): Use as I/O port for peripheral functions |
| PSEL | Peripheral Select |