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AT90SCR100 bảng dữ liệu(PDF) 209 Page - ATMEL Corporation

tên linh kiện AT90SCR100
Giải thích chi tiết về linh kiện  8-bit Microcontroller for Smart Card Readers
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nhà sản xuất  ATMEL [ATMEL Corporation]
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AT90SCR100 bảng dữ liệu(HTML) 209 Page - ATMEL Corporation

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TPR0327AY–SMS–30Jan09
AT90SCR100
Figure 17-4.
Pipes and Endpoints in a USB system
In the USB Host controller, a Pipe will be associated to a Device Endpoint, considering the
Device Configuration Descriptors.
17.5.2
Power-on and Reset
The next diagram explains the USB host controller main states on power-on:
Figure 17-5.
USB SCI states after reset
USB Host controller state after an hardware reset is ‘Reset’. When the USB Host controller is
enabled, the USB controller is in ‘Idle’ state. In this state, the USB Host controller waits for the
Device connection, with a minimum power consumption. The USB Pad should be in Idle
mode. The macro does not need to have the PLL activated to enter in ‘Host Ready’ state.
The Host controller enters in Suspend state when the USB bus is in Suspend state, i.e. when the
Host controller doesn’t generate the Start of Frame. In this state, the USB consumption is mini-
mum. The Host controller exits to the Suspend state when starting to generate the SOF over the
USB line.
<Any
other
State>
Host
Ready
Host
Idle
UHCR.SOFEN=1
UHCR.SOFEN=0
Device
Connection
Clock stopped
Macro off
Device
Disconnection
Device
Disconnection
Host
Suspend



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