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February 2008 Rev 1 1/30
AN2710
Application note
Safe GPIO port configuration
in STR7xx devices
Introduction
The general purpose I/O (GPIO) ports of STR7xx devices are programmable by firmware in
several modes: input, output, alternate function, output open drain, output push-pull,
bidirectional weak push-pull and high impedance. It is possible to manage the analog input
mode as well.
This application note describes the best way of configuring the GPIO ports.
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