Datasheet

304
32133D–11/2011
UC3D
19.7.1 USB General Registers
19.7.1.1 General Control Register
Name: USBCON
Access Type: Read/Write
Offset: 0x0800
Reset Value: 0x00004000
• 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.
• VBUSTE: VBUS Transition Interrupt Enable
0: The VBUS Transition Interrupt (VBUSTI) is disabled.
1: The VBUS Transition Interrupt (VBUSTI) is enabled.
31 30 29 28 27 26 25 24
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23 22 21 20 19 18 17 16
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15 14 13 12 11 10 9 8
USBEFRZCLK------
76543210
------VBUSTE-