Port input/output direction setting register 0
| P0 | Bit0 of DDR0 |
| P1 | Bit1 of DDR0 |
| P2 | Bit2 of DDR0 |
| P3 | Bit3 of DDR0 |
| P4 | Bit4 of DDR0 |
| P5 | Bit5 of DDR0 |
| P6 | Bit6 of DDR0 |
| P7 | Bit7 of DDR0 |
| P8 | Bit8 of DDR0 |
| P9 | Bit9 of DDR0 |
| PA | Bit10 of DDR0 |
| PB | Bit11 of DDR0 |
| PC | Bit12 of DDR0 |
| PD | Bit13 of DDR0 |
| PE | Bit14 of DDR0 |
| PF | Bit15 of DDR0 |