Connecting I2C and SPI Devices to PIC18F45K80

[sgssn]

Yes, it seems you are right. There is only one MSSP-module for both functions.
In the description of the chip you find:
...
1 MSSP serial ports for SPI or I2C™ communication
...

I don't know if it is possible to use both serial functions by changing the program. Perhaps you have to find other chips to only use SPI or I2C.

regards
Gerhard

[creasesuit]

Thanks for your help. It is very helpful. I have successfully connected both I2C and SPI devices to the PIC18F45K80

[head223a]

I know it makes no difference, but is there a reason you routed CS1 and SDA in the back of the board? If possible, I'd avoid crossing data/clock lines. If you're more generous with those 3.3V, you can run the clock separate from TX and RX.