[AVR] Fast PWM signal Generation in ATtiny 24A

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chandresha1

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I want to generate PWM signals of 2MHz using ATtiny24A. I have read in datasheet about fast PWM signals but what i understood is it will allow me to generate only one frequency(or some other options with prescalar) with different duty-cycle. I can't use external crystal because of small-chi size. Is there any other option through which i can generate 2Mhz PWM signals with different duty cycle?
 

Hi,

do you mean 2MHz fundamental PWM frequency?
Or do you mean 2MHz PWM clock frequency?

********

Example:
If you want a PWM fundamental frequency of 10kHz and want to adjust duty cyle with 64 steps (0 to 100%), then you need a PWM clock frequency of 10kHz x 64 = 640kHz.

Klaus
 

2Mhz fundamental frequency. The frequency on output pin. I think little-bit low resolution is also fine. I don't need 64 stapes. My ultimate goal is to generate 5-cycle hanning window signals of 150Khz, 250 Khz and 350 Khz one by one. So in order to generate 350KHz i atleast need 2MHz or i think little-bit more also. After posting this question i actually came to know about ATtiny25 which has some PLL functionality in which we can get really high clock-speed for timers(somewhere about more than 50MHz with 8MHz internal oscillator) . Do you have any suggestion about it also?
 

Hi,

i don´t understand your application. Could you explain it more detailed?

I know "hanning window" as software solution for FFT.

Klaus
 

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