In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Ray;

You are absolutely correct about the A/D being implemented in software, that is with the addition of two resistors and one small non-critical capacitor. Works a "treat". In fact if need be, you can dynamically alter the resolution of the Virtual A/D from 2 bits (or less, but then it's hardly an A/D) through 14 bits. At that extreme the SX's noise starts to get to you. At 8 bits you resolve 20 milliVolts in a 5 Volt range very nicely. The trade-off is a linear speed-for-bits relationship.

Works great for doing DFT's and FFT's in the SX for audio, tone detection etc.

I'm curious which of the two RTOS's you are pursuing. The non-preemptive is very simple, and of course simple minded. The pre-emptive is fairly tricky, and takes some experienceto get the full gist.

Keep on pluggin' !

Cheers,

Peter (pjv)

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