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The Cygnal C8051Fxxx is a family of in-system programmable, mixed signal System-on-Chip microcontroller products. They integrate world-class analog, a high-speed (up to 50MIPS) pipelined 8051 CPU, ISP Flash Memory, and on-chip JTAG based debug in each device.
The fastest microcontroller is FPGA!
Yes, for real, implementation of popular uC architecture in FPGA sometime could be in 10 time faster than original one! Of course, you will go out without some peripheral resourses like on-chip A/D, but from another point of view, Scenix' SX serie also has near no peripheral on-chip. Moreover, taking into account that modern FPGA price is on the same level with uC from Cygnal, this idea has good chances to be considered during selecting of the fastest and best.