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

[quote="PJMonty"]
Metron9,

The guy's name you're thinking of is Nyquist, and he's famous for the Nyquist theorem. However, the Nyquist theorem has to do with sampling systems (such as analog to digital converters) and has nothing to do with plain old analog systems. Thus, if you have a scope that goes to 100 MHz, then you can read a signal up to 100 MHz. 
[/quote]
Peter is right of course, but I think we should add in one more word: [i]you can read a[b] sinewave[/b] signal up to 100 MHz.[/i]

[i][/i] 

A 100MHz scope may not be able to accuratly display a 100 MHz squarewave signal for example. That is because the squarewave (or anything other than a sinewave) contains harmonics of much higher frequencies inside of it. Most analog designers know that so well they don't bother mentioning it, but us digital people sometimes don't realize it.

 

For more on Read/Modify/Write problems (which are a seperate issue) see:

[url=http://www.sxlist.com/techref/readmodwrite.htm]http://www.sxlist.com/techref/readmodwrite.htm[/url] 

 

For clock information on the SX, see:

[url=http://www.sxlist.com/techref/ubicom/clocks.htm]http://www.sxlist.com/techref/ubicom/clocks.htm[/url]

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