Do you intend to use the same crystal for both the PIC and the MCP2120? If not I can't see why you can't use 14.7456 for the MCP2120 and whatever for the PIC. With a 20Mhz crystal on the PIC you'll be off less than 1% at 115200 baud.
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Re: 18.432 and 14.7456 oscillator.
Do you intend to use the same crystal for both the PIC and the MCP2120? If not I can't see why you can't use 14.7456 for the MCP2120 and whatever for the PIC. With a 20Mhz crystal on the PIC you'll be off less than 1% at 115200 baud.
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