I asked a friend to post to this forum about desinging a PIC-basedPWM. Now that I have joined this forum, I'll get more specific aboutmy requirements. Thanks by the way for all your interesting andinformative responses.What I am trying to do is make a frequency synthesizer that willoutput 1Hz to say 40kHz in 1Hz resolution. I need to input via akeypad, and have an LCD display show me the inputted frequency. I knowvirtually zero about assembly language! I am presently programmingPICs with PicBasic Pro. That's the first hurdle - if I can eitherprogram this in BASIC or cut-n-paste assembly code in areas that needfast excecutuion then that's fine.I have seen examples whereby one can make a PIC act like an NumericalControlled Oscillator (NCO), and one gets a cheap DDS. Cost is anissue, so the cheaper and simpler the better. I do not mind using 2 xPICs for the interface and control. The output frequency need only bestable to +/-0.1 Hz.I am totally new to DDS (Analog Device IC's, etc.) so that is hurdle#2.I would appreciate any information you can offer. I apologize inadvance if I ask some basic questions! Thanks kindly! Russ >:)

"RussT" schreef in berichtnews:Take a look at this page:AVR's are faster than PIC, at a given clock frequency. Also, theAVR has some very convenient instructions for table lookup, makinga software DDS more practical compared to PIC.-- Thanks, Frank.(remove 'x' and 'invalid' when replying by email)

PIC16F84.-- Luhan Monat, "LuhanKnows" At 'Yahoo' dot 'Com'"The future is not what it used to be."

PIC + DDS = Frequency Synthesizer?

Jan 02, 2004 41 Replies

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Spehro Pefhany 22 years ago

There's virtually no excuse to design anything new with that old horse. PIC16F628.

Best regards, Spehro Pefhany

-- "it's the network..." "The Journey is the reward" snipped-for-privacy@interlog.com Info for manufacturers:

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Luhan Monat 22 years ago

PIC16F84.

Luhan Monat, "LuhanKnows" At 'Yahoo' dot 'Com' http://members.cox.net/berniekm "The future is not what it used to be."

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