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AT90USB646 Datasheet(PDF) 257 Page - ATMEL Corporation

Part # AT90USB646
Description  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 257 Page - ATMEL Corporation

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257
7593A–AVR–02/06
AT90USB64/128
• the HWUPI interrupt is triggered in the Host mode (HOST set).
• the IDTI interrupt is triggered
• the VBUSTI interrupt is triggered
21.5.3
Freeze clock
The firmware has the ability to reduce the power consumption by setting the FRZCLK bit, which
freeze the clock of USB controller. When FRZCLK is set, it is still possible to access to the fol-
lowing registers:
• USBCON, USBSTA, USBINT
• DPRAM direct access (DPADD10:0, UxDATX)
• UDCON (detach, ...)
•UDINT
•UDIEN
•UHCON
•UHINT
•UHIEN
Moreover, when FRZCLK is set, only the following interrupts may be triggered:
• WAKEUPI
•IDTI
• VBUSTI
•HWUPI
21.6 Speed Control
21.6.1
Device mode
When the USB interface is configured in device mode, the speed selection (Full Speed or Low
Speed) depends on the UDP/UDM pull-up. UDSS register allows to select an internal pull up on
UDM (Low Speed mode) or UDP(Full Speed mode) data lines. UDSS should be configure
before attaching the device.
Figure 21-14. Device mode Speed Selection
DETACH
UDCON.0
UDP
UDM
LSM
UDCON.2
UCAP
USB
Regulator



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