>> Suddenly I need one more UART, without jumping to PIC30F3013
>> for the code.
>>
>> Anything else besides the MAX3110/3111? I like SPI interfaces..
>
>Code up an AVR :)

Or a small PIC ...

>In all seriousness, why not use another processor.
>In the end, it's a box with a crystal.

You could probably do away with the crystal and use the existing processor
clock source ...

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