AN1799 Datasheet, PDF (1/7 Pages) STMicroelectronics – STR71x GPIO SCANNING A 4x4 MATRIX KEYPAD

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.
AN1799/0205
Rev. 2
1/7
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