Oleg Sergeev wrote:
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"Atmel AT89C51RB2/RC2/RD2/ED2/IC2/ID2 support up to 60MHz in X1 mode."

But, like I said, a SiLabs controller will outperform it at a much lower frequency. Depending on the actual code, the speed improvement will be somewhere between 6 and 8 times, so roughly speaking, a SiLabs controller at only 10MHz will be as fast or even faster!

There is an interesting White Paper on the performance of the SiLabs core for standard maths routines.


Best regards,
Rob.