OTG_FS device control IN endpoint 0 control register (OTG_FS_DIEPCTL0)
| MPSIZ | Maximum packet size |
| USBAEP | USB active endpoint |
| NAKSTS | NAK status |
| EPTYP | Endpoint type |
| STALL | STALL handshake |
| TXFNUM | TxFIFO number |
| CNAK | Clear NAK |
| SNAK | Set NAK |
| EPDIS | Endpoint disable |
| EPENA | Endpoint enable |