User`s manual

Am186™CC Microcontroller Router Reference Design User’s Manual
2-24
Detach
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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