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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT90SCR100 데이터시트(PDF) 210 Page - ATMEL Corporation |
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AT90SCR100 데이터시트(HTML) 210 Page - ATMEL Corporation |
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210 / 433 page  210 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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