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AN1799 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN1799
Description  STR71x GPIO SCANNING A 4x4 MATRIX KEYPAD
PDF  7 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1799 Datasheet(HTML) 6 Page - STMicroelectronics

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STR71x GPIO SCANNING A 4x4 MATRIX KEYPAD
T0TIMI_IRQHandler
Clear the T0 overflow flag
Turn Off all 7-segment LED displays
Send digit to display
Turn on 7-segment displays
End T0TIMI_IRQHandler
Key released = True
Yes
No
XTI_IRQHandler
Clear XTI pending bits
KeyPressed = True
Read Pressed Key Code
End XTI_IRQHandler



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