In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

I am a bit confused at how or why we have to use external resonators. I have had a 4 MHz resonator plugged into my Professional Development Board (Y1) for sometime now and found out that the SX28 must have an internal oscillator built in (as I can take it out and it still runs my program).
 

How does one know what resonator to use (or even at all). I have a few 4 MHz, 20 MHz and 50 MHz from Parallax thinking they were required for use with the SX28. 

 

I have a SX28 LED Moving display sign project that I can change internal SX28 settings to 32 KHz or 4 MHz and it does NOT speed up or slow down my display. 

 

DEVICE          SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ            4_000_000   

 

or 

 

DEVICE          SX28, OSC32KHZ, TURBO, STACKX, OPTIONX
FREQ             32_000   

 

How does one know what to use to speed the SX28 programs up or slow them down?

 

I don't quite see my answer from the SX Key Development System manual v2.

 

Any direction would be helpfull.

 

Thanks,

 

Timothy Gilmore

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