ATEVK1104 Atmel, ATEVK1104 Datasheet - Page 503

• Manufacturer Part Number: ATEVK1104
• Description: KIT DEV/EVAL FOR AVR32 AT32UC3A
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1104

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A3
• Data Bus Width: 32 bit
• Interface Type: USB, SPI, USART
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A3256
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

30.7
30.7.1
30.7.1.1
30.7.1.2
Figure 30-5. General States
32058J–AVR32–04/11
Functional Description
USB General Operation
Introduction
Power-On and Reset
After a hardware reset, the USB controller is disabled. When enabled, the USB controller runs
either in device mode or in host mode according to the ID detection.
If the USB_ID pin is not connected to ground, the ID bit is set by hardware (the internal pull-up
resistor of the USB_ID pin must be enabled by the GPIO controller) and device mode is
engaged.
The ID bit is cleared by hardware when a low level has been detected on the USB_ID pin. Host
mode is then engaged.
Figure 30-5
After a hardware reset, the USB controller is in the Reset state. In this state:
After setting USBE, the USB controller enters the Device or the Host mode (according to the ID
detection) in idle state.
The USB controller can be disabled at any time by clearing USBE. In fact, clearing USBE acts
as a hardware reset, except that the OTGPADE, VBUSPO, FRZCLK, UIDE, UIMOD and LS bits
are not reset.
•the macro is disabled (USBE = 0);
•the macro clock is stopped in order to minimize power consumption (FRZCLK = 1);
•the pad is in suspend mode;
•the internal states and registers of the device and host modes are reset;
•the DPRAM is not cleared and is accessible;
•the ID and VBUS read-only bits reflect the states of the USB_ID and VBUS input pins;
•the OTGPADE, VBUSPO, FRZCLK, USBE, UIDE, UIMOD and LS bits can be written by
software, so that the user can program pads and speed before enabling the macro, but their
value is only taken into account once the macro is enabled and unfrozen.
describes the USB controller main states.
Clock stopped:
FRZCLK = 1
Device
Macro off:
USBE = 0
USBE = 1
ID = 1
USBE = 0
Reset
USBE = 1
ID = 0
USBE = 0
USBE = 0
Host
RESET
HW
state>
<any
other
AT32UC3A
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