Datasheet

315
32133D–11/2011
UC3D
19.7.2 USB Device Registers
19.7.2.1 Device General Control Register
Register Name: UDCON
Access Type: Read/Write
Offset: 0x0000
Reset Value: 0x00000100
• GNAK: Global NAK
0: Normal mode.
1: A NAK handshake is answered for each USB transaction regardless of the current endpoint memory bank status.
• LS: low-speed mode force
0: The full-speed mode is active.
1: The low-speed mode is active.
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.
• RMWKUP: Remote wakeup
Writing a zero to this bit has no effect.
Writing a one to this bit will send an upstream resume to the host for a remote wakeup.
This bit is cleared when the USBC receives a USB reset or once the upstream resume has been sent.
• DETACH: Detach
Writing a zero to this bit will reconnect the device.
Writing a one to this bit will physically detach the device (disconnect internal pull-up resistor from DP and DM).
• ADDEN: Address Enable
Writing a zero to this bit has no effect.
Writing a one to this bit will activate the UADD field (USB address).
This bit is cleared when a USB reset is received.
• UADD: USB Address
This field contains the device address.
This field is cleared when a USB reset is received.
31 30 29 28 27 26 25 24
--------
23 22 21 20 19 18 17 16
------GNAK-
15 14 13 12 11 10 9 8
- - - LS - - RMWKUP DETACH
76543210
ADDEN UADD