The pushbutton can be replaced or extended by a series capacitor and pulldown resistor from VBUS. So the MSP gets powered when the USB is plugged-in and can then power-down itself without user action.
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The pushbutton can be replaced or extended by a series capacitor and pulldown resistor from VBUS. So the MSP gets powered when the USB is plugged-in and can then power-down itself without user action.