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AT90SCR100 Datasheet(PDF) 210 Page - ATMEL Corporation

Part # AT90SCR100
Description  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 Datasheet(HTML) 210 Page - ATMEL Corporation

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TPR0327AY–SMS–30Jan09
AT90SCR100
17.5.3
Device Detection
A Device is detected by the USB controller when the USB bus if different from D+ and D- low. In
other words, when the USB Host Controller detects the Device pull-up on the D+ line. To enable
this detection, the Host Controller has to provide the Vbus power supply to the Device, thanks to
CVcc pin.
The Device Disconnection is detected by the USB Host controller when the USB Idle correspond
to D+ and D- low on the USB line.
17.5.4
Pipe Selection
Prior to any operation performed by the CPU, the Pipe must first be selected. This is done by:
• Clearing PNUMS.
• Setting PNUM with the Pipe number which will be managed by the CPU.
The CPU can then access to the various Pipe registers and data.
17.5.5
Pipe Configuration
The following flow must be respected in order to activate a Pipe:
When a Device Disconnection event has been detected, you must reset the USB
Host module, to reset the internal parameters and be able to support a new
connection.
Caution
!



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