AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 257

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

21.5.3
21.6
21.6.1
7593A–AVR–02/06
Speed Control
Freeze clock
Device mode
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:
Moreover, when FRZCLK is set, only the following interrupts may be triggered:
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
• the HWUPI interrupt is triggered in the Host mode (HOST set).
• the IDTI interrupt is triggered
• the VBUSTI interrupt is triggered
• USBCON, USBSTA, USBINT
• DPRAM direct access (DPADD10:0, UxDATX)
• UDCON (detach, ...)
• UDINT
• UDIEN
• UHCON
• UHINT
• UHIEN
• WAKEUPI
• IDTI
• VBUSTI
• HWUPI
UCAP
UDM
UDP
DETACH
UDCON.0
UDCON.2
LSM
AT90USB64/128
Regulator
USB
257