Datasheet

372
42023E–SAM–07/2013
ATSAM4L8/L4/L2
17.7.1 USB General Registers
17.7.1.1 General Control Register
Name: USBCON
Access Type: Read/Write
Offset: 0x0800
Reset Value: 0x03004000
• UIMOD: USBC Mode
0: The module is in USB host mode.
1: The module is in USB device mode.
This bit can be written to even if USBE is zero or FRZCLK is one. Disabling the USBC (by writing a zero to the USBE bit) does
not reset this bit.
• USBE: USBC Enable
Writing a zero to this bit will disable the USBC, USB transceiver, and USB clock inputs. This will over-ride FRZCLK settings but
not affect the value. Unless explicitly stated, all registers will become reset and read-only.
Writing a one to this bit will enable the USBC.
0: The USBC is disabled.
1: The USBC is enabled.
This bit can be written to even if FRZCLK is one.
• FRZCLK: Freeze USB Clock
Writing a zero to this bit will enable USB clock inputs.
Writing a one to this bit will disable USB clock inputs. The resume detection will remain active. Unless explicitly stated, all
registers will become read-only.
0: The clock inputs are enabled.
1: The clock inputs are disabled.
This bit can be written to even if USBE is zero.
31 30 29 28 27 26 25 24
------UIMOD-
23 22 21 20 19 18 17 16
------
15 14 13 12 11 10 9 8
USBEFRZCLK------
76543210
--------