AN1799 datasheet(1/7 Pages) STMICROELECTRONICS

Part #	AN1799

Description	STR71x GPIO SCANNING A 4x4 MATRIX KEYPAD

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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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.

1

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