In SX Microcontrollers, SX/B Compiler and SX-Key Tool, James Newton wrote:

Please check the datasheet. Are the current SX's are rated to run at 50Mhz at 3.3 volts? 
 

Does your Tektronics blink program run at 3.3v with a lower frequency resonator? 

 

My clue here is that most other processors (e.g. PIC) will NOT run at the same speed when you reduce the voltage and the one known application that has been mentioned here which DOES run at 3.3 is doing so at 8Mhz. The old SX chips from Scenix WERE rated to run at 50Mhz down to 3.0v, but those were also rated to run at 75 or 100Mhz at 5v. I would not be sure that the current Parallax produced chips are quite so magical.

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