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AT90USB646 Datasheet(PDF) 263 Page - ATMEL Corporation

Part # AT90USB646
Description  8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  435 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 263 Page - ATMEL Corporation

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263
7593D–AVR–07/06
AT90USB64/128
mode (internal pull-up). The IDTI interrupt is triggered when a A-plug (Host) is plugged or
unplugged. The interrupt is not triggered when a B-plug (Periph) is plugged or unplugged.
ID detection is independant of USB global interface enable.
21.12 Registers description
21.12.1
USB general registers
• 7 – UIMOD: USB Mode Bit
This bit has no effect when the UIDE bit is set (external UID pin activated). Set to enable the
USB device mode. Clear to enable the USB host mode
• 6 – UIDE: UID pin Enable
Set to enable the USB mode selection (peripheral/host) through the UID pin. Clear to enable the
USB mode selection (peripheral/host) with UIMOD bit register.
UIDE should be modified only when the USB interface is disabled (USBE bit cleared).
• 5 – Reserved
The value read from this bit is always 0. Do not set this bit.
• 4 – UVCONE: UVCON pin Enable
Set to enable the UVCON pin control. Clear to disable the UVCON pin control. This bit should be
set only when the USB interface is enable.
• 3-1 – Reserved
The value read from these bits is always 0. Do not set these bits.
• 0 – UVREGE: USB pad regulator Enable
Set to enable the USB pad regulator. Clear to disable the USB pad regulator.
• 7 – USBE: USB macro Enable Bit
Set to enable the USB controller. Clear to disable and reset the USB controller, to disable the
USB transceiver and to disable the USB controller clock inputs.
• 6 – HOST: HOST Bit
Set to enable the Host mode. Clear to enable the device mode.
• 5 – FRZCLK: Freeze USB Clock Bit
Bit
7
6
5
4
321
0
UIMOD
UIDE
UVCONE
UVREGE
UHWCON
Read/Write
R/W
R/W
R
R/W
R
R
R
R/W
Initial Value
1
0
0
0
0
0
0
0
Bit
7
6
5
4
321
0
USBE
HOST
FRZCLK
OTGPADE
-
-
IDTE
VBUSTE
USBCON
Read/Write
R/W
R/W
R/W
R/W
R
R
R/W
R/W
Initial Value
0
0
1
0
0
0
0
0



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