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  • Interfacing a 4x4 Matrix Keypad with an 8-Bit GPIO Expander
    to the GPIO register will write application note references the MCP23X08/17 GPIO that value to the output latches for each pin. Also, Expander Keypad/LCD Demo Board (GPIODM- reading of GPIO unlocks the Interrupt Capture KPLCD). Register (INTCAP) and deactivates the interrupt GPIO Expanders provide easy I/O