Microchip Technology MCP23X17EV Manual De Usuario
MCP23X17 Evaluation Board User’s Guide
DS51592B-page 10
© 2006 Microchip Technology Inc.
FIGURE 2-2:
MAIN FIRMWARE FLOW
Start
Init_MCU
Init_MCP
Check Device
Selector Switch
MCP23017 or
MCP23S17?
Set Serial Mode to
SPI
Configure
MCP23S17 to
inputs so it does
not interfere
Set Serial Mode to
I
2
C
Set MCP23017
LED I/O to Output
Read Inputs
Blink
Alt
Scroll
KR
Recent Button
Pressed?
23017
Set Serial Mode to
I
2
C™
Configure
MCP23017 to
inputs so it does
not interfere
Set Serial Mode to
SPI
Set MCP23S17
LED I/O to Output
23S17
Most