Req: Configurable assembler - is there one for custom instructions?

Does anyone know if uvision of software allows me to enter a template, or lookup table, for my own instruction set and unique op codes and then automatically create an assembler for it? I have too many projects to do than to have time or priority to write one from scratch.

Also looking for a good state machine tool, ideally supporting ROM-based ("programmable") state machine architectures.

If you can recommend any of these, please advise (pls don't PM, as others may be interested as well). Posting it is even better

thanks

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