dd>
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<dl class="section return"><dt>Returns</dt><dd><a class="el" href="group__execution__status.html">Status Error Codes</a></dd></dl>
<p>The function <b>ARM_USBH_HCI_PortVbusOnOff</b> controls the VBUS signal of the specified port. Most HCI complained USB Host controllers do not require this optional function. It is only required when a external VBUS interface (for example via I/O pin) is required. </p>

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