AN1799/0205

1/7

Rev. 2

AN1799

APPLICATION NOTE

STR71x GPIO

SCANNING A 4x4 MATRIX KEYPAD

INTRODUCTION

The aim of this application note is to show how to scan the 4x4 matrix keypad multiplexed with

a four 7-segment display. The software attached to this application note scans the pressed

key and displays it on the multiplexed 7- segment LEDs.

This application note describes how the interrupt capability of the STR710 device is used to

offer a better key scan.

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