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MCP23X17 Evaluation Board User’s Guide
FIGURE 2-2:
MAIN FIRMWARE FLOW
Start
Init_MCU
Init_MCP
Check Device
Selector Switch
Set Serial Mode to
SPI
23017
MCP23017 or
MCP23S17?
23S17
Set Serial Mode to
I 2 C?
Configure
MCP23S17 to
inputs so it does
not interfere
Set Serial Mode to
I 2 C
Configure
MCP23017 to
inputs so it does
not interfere
Set Serial Mode to
SPI
Set MCP23017
LED I/O to Output
Read Inputs
Most
Recent Button
Pressed?
Set MCP23S17
LED I/O to Output
DS51592B-page 10
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? 2006 Microchip Technology Inc.
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