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Installation and Operation
FIGURE 2-3:
MAIN FIRMWARE FLOW
Start
Init_MCU
Init_MCP
Splash
The MCP23X08 is
configured to interrupt on
NO
falling edge for the
columns (4 inputs)
GPIO INT Flag
Set?
After the interrupt, the column
location of the button is known
YES
Scan_Buttons
and is contained in INTCAP.
Need to read GPIO to get the
Row location.
Buttons:
0-9, #, * : Copied to the LCD
M: Toggle mode (SPI and I 2 C?)
B: Backspace
R: Carriage Return
S: Space
Update_LCD
? 2006 Microchip Technology Inc.
DS51636A-page 11
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