Nicholas,

Now that I know you are using a 40 MHz clock for the PIC18F452 you must
change the value you are loading into SSPADD:

You are loading a value of 0x09, but if your Fosc to the PIC is 40 MHz, then
your SCL clock frequency is actually 1 MHz!
Clearly this is in violation of the MAX417 (which is rated at 400 KHz
maximum). I'm not saying this will fix your problem, but you don't want to
operate above the manufacturer's specifications.

In other words Nicholas this line of code would be wrong for an external
clock of 40 MHz:

    SSPADD = 9;     //400KHz Baud clock (9) @16MHz


Your homework assignment:

Calculate a new SSPADD value, report back and I will verify the value you
calculated.


Best regards,

Ken Pergola

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