Datasheet

551
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
28.15.12 PMC USB Clock Register
Name: PMC_USB
Address: 0x400E0638
Access: Read-write
This register can only be written if the WPEN bit is cleared in “PMC Write Protect Mode Register” .
• USBS: USB Input Clock Selection
0 = USB Clock Input is PLLA.
1 = USB Clock Input is PLLB.
• USBDIV: Divider for USB Clock.
USB Clock is Input clock divided by USBDIV+1.
31 302928 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
––––––––
15 14 13 12 11 10 9 8
–––– USBDIV
76543 210
–––––––USBS