SDI clock control register (SDIO_CLKCTRL)
| CLKPSC | Clock divide factor |
| CLKEN | Clock enable bit |
| PWRSVG | Power saving configuration bit |
| BYPS | Clock divider bypass enable bit |
| BUSWIDTH | Wide bus mode enable bit |
| CLKEDG | SDIO_CK dephasing selection bit |
| FLWCTRLEN | HW Flow Control enable |
| CLKPSC98 | Clock divide factor bit9 and bit8 |