Port input/output direction setting register 0
| P00 | Bit0 of DDR0 |
| P01 | Bit1 of DDR0 |
| P02 | Bit2 of DDR0 |
| P03 | Bit3 of DDR0 |
| P04 | Bit4 of DDR0 |
| P05 | Bit5 of DDR0 |
| P06 | Bit6 of DDR0 |
| P07 | Bit7 of DDR0 |
| P08 | Bit8 of DDR0 |
| P09 | Bit9 of DDR0 |
| P0A | Bit10 of DDR0 |
| P0B | Bit11 of DDR0 |
| P0C | Bit12 of DDR0 |
| P0D | Bit13 of DDR0 |
| P0E | Bit14 of DDR0 |
| P0F | Bit15 of DDR0 |