So, excuse me for the delay.  I'm now back with this problem.    I hope CONSULTRON could continue helping me as he gave me the example I'm working with.

As I stated first, I need to move frequency about +- 12% from a frequency, that is a little lower than 5 KHz, in order to sustain some resonance on the system.  i have seen what you sent, I understand that the clock was defined as the 8 bit period (256) multiplied by 5,000 Hertz, so you get a clock of 1.28 MHz. but as I need to move smoothly the frequency from the program (see the image freq_resonance attached), I see at first sight two posibilities: 

1. To change the frequency on the clock with  Clock_SetDividerValue(uint16 clkDivider) or

2. To change Period of the first PWM 

The problem is that I don't know which values are elegible in case 1. and that the steps that would be available in case 2. are very wide (18.35 Hertz per step), and, if the range is about 564 Hertz for each side, with 30 steps I'll never can sustain resonance (I would correct from a derivative control factor, but if it doesn't work, it would become a PID algorithm). I think that the minimal step should be about 4 or 3 Hz.  At the beginning, the program will scan the range until it finds the resonance frequency.  The input for the program will be a sound, so when amplitude reach a peak, the program has to avoid loosing resonance moving frequency as needed.  The resonance freq. could vary a little with rise of temp, the system has to make the changes needed, if amplitude begin to decrease, it has to oscilate slowly to verify on which direction it reaches the peak again (zero slope).  I think that the green range, of about 500 Hz will be enough, but I'll know it until the experiment be phisically implemented.  

 Another thing that I want you to help me is the next:  I have to sustanin resonance, but I want to read and display several sensors (a microphone, temp, presure, amp, volt, etc).    How can I do all that?   That is, I think I have to avoid to wait for response, it be a sensor, the display or whatever, so I think I would have to have a clock and each component would check if the delay time is reached for it, each round of the program, so for instance, it could send another data to display or it could read an ADC register if a flag is now on on each one. This way I don't interrupt the frequency generator. (supposing that it become stopped while a delay instruction is working)  So, if You could help me to make clear this item I'd thank  you a lot.

I have not reviewed the other example you gently sent me, but from a surface sight, I think that LUT  can't comply with the requirement of min step here stated, but you can correct me if I'm wrong.   

I wonder if, as it is marked as solved (I don't understand what for is that costume of setting as solved this), this question will be seen and attended.   I hope it be...

Thank you again

Luis

I have checked the signal of the example in my psoc 5 and an image of it is attached as Fase1 y 2.  That means that I have saved some obstacles until having it working.  This is not much, but it is some advance.  I'm going to put more time on this project in next weeks.