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Thanks! there's a way to change the period of pwm without changing the
duty ?

I forgot to set the duty,
this is the complete code and compilable:

#include <18F4550.h>
#device adc=10
#fuses HSPLL,WDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN, PUT
#use delay ...

I have a simple code that I expect to generate a pwm with 11khz and 50% duty but isn't, it only works when I change the timer setup for:
setup_timer_2(T2_DIV_BY_16,244,1);
It generates a a ...