Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD 数据表
产品代码
ATSAM4S-WPIR-RD
535
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
29.17.12PMC USB Clock Register
Name:
PMC_USB
Address:
0x400E0438
Access:
Read/Write
This register can only be written if the WPEN bit is cleared in
• USBS: USB Input Clock Selection
0: USB Clock Input is PLLA.
1: USB Clock Input is PLLB
1: USB Clock Input is PLLB
• USBDIV: Divider for USB Clock
USB Clock is Input clock divided by USBDIV+1.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
USBDIV
7
6
5
4
3
2
1
0
–
–
–
–
–
–
–
USBS