Atmel SAM4L Xplained Pro Evaluation Kit Atmel ATSAM4L-XPRO ATSAM4L-XPRO Scheda Tecnica

Codici prodotto

ATSAM4L-XPRO

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.

UIMOD

USBE

FRZCLK