I am exploring STC 8051 MCU and writing up

[ebclr]

Are you sure ?

https://world.tmall.com/item/539649031832.htm?spm=a312a.7700714.0.0.mJrRTa

[technix]

Are you sure ?

https://world.tmall.com/item/539649031832.htm?spm=a312a.7700714.0.0.mJrRTa

Arduino Due clones are a bit cheaper than this, so might as well pass on to something that is slightly better supported.

[dannyf]

C8051F320 

If you are interested in mixed signal work - measurement instrumentation for example, F350 is a god sent.

[technix]

C8051F320 

If you are interested in mixed signal work - measurement instrumentation for example, F350 is a god sent.

Back when I was planning on making my own multimeter I was thinking about using the MCP3911 ADC with whatever MCU ended up being appropriate for the code.

[technix]

So are you guys still interested in this?

[grantb5]

I would suggest that on your studies you compare against

EFM8BB10

and

C8051F320 

Both from silabs, those are the fastest 8051 I know, STC is also a option but more on price than specs

I have used the C8051F380 and EFM8UB20F64G (same chip by a different name) and it's excellent. I would also highly recommend Nuvoton's Flash 8051 parts. Both SILabs and Nuvoton have real debugging (single-step, breakpoint, watch variables, etc) rather then burn and learn. Both are available in stock at normal distributors (Digikey and/or Mouser and probably more).