In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Thomas Taylor wrote:

Guenther,

Thanks for the confirmation on the switching and frequency issue. On other papers concerning EMI issues there was some mention of transition times around 2 ns, and this was for a higher clock frequency, so your estimate puts it right in the ballpark.

On another response of yours (thread on voltage regulators, 78XX) you gave some info on the LM2574 stating it was a favorite of yours. That gave me an idea that will help solve a heat issue I was facing so I printed out National's data sheets and will start experimenting with it when I get hold of one on my next parts order. Thanks for the info. BTW, that sure is a compact board you have! That photo is what really sparked my interest. No more large heatsink!

Thomas

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William,

I hope I have not made my project sound more glorified than it is. The Slave SX28s are simply smart LED drivers. Each has a unique program routine that they perform but only under the direction of the Master SX. The timing is really slow and non-critical. The Slaves (and a sound chip) basically wait looking for their coded address to appear in the A register, then off they go, performing a specific task that when accomplished they return and continue to wait looking for the next code in the A register.

I do appreciate your question and concern about the oscillator tolerance. Thanks

Thomas

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