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'[SX] SXB Square Wave'
2009\03\25@134350 by Cenlasoftn/a

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

Hello,
I have been trying Terry's sweep code with no luck. I am sure it me doing something wrong. I used a scope and an LCR circuit to see if I could get to resonance. If I use the interrupt without sweep at one frequency, it works.

Device SX28, Oschs2, Turbo, OptionX, StackX
Freq 50_000_000
OutPin Pin RA.0 Output reload VAR BYTE
Interrupt NOCODE
OutPin =~ OutPin
Returnint reload
Program Start
Start:
FOR reload = 139 TO 111 STEP -1
PAUSE 1000 ' CHANGES SWEEP SPEED
NEXT
GOTO Start
End
I am trying to get resonance but the square wave produced is not accurate enough.
Thanks for any hints.
Cenlasoft
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2009\03\26@085227 by HW_to_SWn/a

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

Can you post a schematic so we can see the circuit?  I'm not clear by what you mean when you say "resonance".  What do you want the output pin to do?  What is your waveform period?  (How much time do you want to see between two rising edges of your "outpin" waveform?)
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2009\03\26@091759 by beann/a

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

Cenlasoft,
 It is very possible that you don't have enough resoultion to get resonance. But with a 50MHz clock you can only vary the ON/OFF time by a minimum of 20nSec.

Bean.

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