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Am186™CC Microcontroller Router Reference Design User’s Manual

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1. Am186CC microcontroller polls PIO42 for a logic Low level to detect a

disconnect condition from the host/hub.

2. The Am186CC microcontroller three-states USBD+ and USBD– in response

to the disconnect.

3. The Am186CC microcontroller drives PIO43 to a logic Low level, which

disables Q1 and removes the pullup (R67) from USBD+.

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Eurotech BRI ISDN Bedienungsanleitung Seite 50