configuration register
| I2SMOD | I2S mode selection |
| I2SCFG | I2S configuration mode |
| I2SSTD | I2S standard selection |
| PCMSYNC | PCM frame synchronization |
| DATLEN | Data length to be transferred |
| CHLEN | Channel length (number of bits per audio channel) |
| CKPOL | Serial audio clock polarity |
| FIXCH | Word select inversion |
| WSINV | Fixed channel length in SLAVE |
| DATFMT | Data format |
| I2SDIV | I2S linear prescaler |
| ODD | Odd factor for the prescaler |
| MCKOE | Master clock output enable |