4.17.18.15 PMC USB Clock Register
This register can only be written if the WPEN bit is cleared in the PMC Write Protection Mode Register.
| Name: | PMC_USB |
| Offset: | 0x0038 |
| Reset: | 0x00000000 |
| Property: | Read/Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| Access | |||||||||
| Reset |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| USBDIV[3:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | |||||
| Reset | 0 | 0 | 0 | 0 | |||||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| USBS[1:0] | |||||||||
| Access | R/W | R/W | |||||||
| Reset | 0 | 0 | |||||||
Bits 11:8 – USBDIV[3:0] Divider for USB OHCI Clock
USB Clock is input clock divided by USBDIV + 1.
Bits 1:0 – USBS[1:0] USB OHCI/EHCI Input Clock Selection
| Value | Name | Description |
|---|---|---|
| 0 | SYSPLL | The USB clock input is SYSPLLCK. |
| 1 | USBPLL | The USB clock input is USBPLLCK. |
| 2 | MAINXTAL | The USB clock input is the main crystal oscillator clock. |
| 3 | – | Reserved |