Техническая Спецификация для Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105
Модели
ATEVK1105
522
AT32UC3A
30.7.3
USB Host Operation
30.7.3.1
Description of Pipes
For the USB controller in host mode, the term “pipe” is used instead of “endpoint” (used in
device mode). A host pipe corresponds to a device endpoint, as described by the
from the USB specification.
Figure 30-22.
USB Communication Flow
In host mode, the USB controller associates a pipe to a device endpoint, considering the device
configuration descriptors.
30.7.3.2
Power-On and Reset
describes the USB controller host mode main states.
Figure 30-23.
Host Mode States
After a hardware reset, the USB controller host mode is in the Reset state.
When the USB macro is enabled (USBE = 1) in host mode (ID = 0), its host mode state goes to
When the USB macro is enabled (USBE = 1) in host mode (ID = 0), its host mode state goes to
the Idle state. In this state, the controller waits for device connection with minimal power con-
sumption. The USB pad should be in the Idle state. Once a device is connected, the macro
enters the Ready state, what does not require the USB clock to be activated.
Ready
Idle
Device
Disconnection
<any
other
other
state>
Device
Connection
Macro off
Clock stopped
Device
Disconnection
Suspend
SOFE = 1
SOFE = 0
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AVR32-01/12