Well.. Thank you Skimask and Luciano. Excelent readings!

So, I've bought a 16F777 and it has 3 CCP modules. As suggest in the readings above, it becomes easier to create an analog output when using high PWM frequencys. Using @ 20Mhz and Mister_E's PicMultiCalc, it turn out that it can generate frequencys > 20Khz, what is enought to this application.

Timer2 is responsable to control the PWM frequencys (all the same).

Timer1 is responsable to create the interruption to supply the new duty cycle value.

Now, let'ss think about the sine table and the software. Just to remember, I'll create an interface to control sine frequency, amplitude and also the sine table, as it would be interesting to create harmonics, sags and swells.

The sine table could be in the pic's data memory or it could be sent throught USART everytime that the user changes the interface option, like frequency. Do you think that it would work in real time using USART?


Thanks again!