Good question, it disconnects the supply from the VCC pin whilst the button is pressed. So if your powering your micro from the adapter it provides a convenient way to manually reset it.What does the pushbutton do?
Modules for interfacing including USB to serial and SD adaptors.
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Thank you for that confirmation. My trial and error pushing the button to see what happened seemed to indicate that but I worried that it might have other actions. The module works well allowing me to interrogate a Multiplex RC transmitter.