[PIC] pic pwm problem using pic16f877a

[bhoobalan]

Hello friends,
I am generating pwm signal in CCP1CON and CCP2CON of PIC16F877A controller and also i connected two led's across the pin with resistor's. I am getting output in the oscilloscope but the led's are blinking, why the led's are blinking?
How should i rectify the blinking of led's? There is a voltage variation also why it happens?
I have attache my code and circuit diagram.
Pls reply me

Thank you

 

[betwixt]

Where is the voltage variation?

I suspect your problem is in the values you load into CCPR1L1 and CCPR2L. The frequency you are askig for is not possible with this PIC, in fact the lowest frequency PWM it can generate is 1.22KHZ, more than 10 times higher than your software suggests. I would guess the flashing LEDs is due to the software delays you added in the loop before loading the CCPR registers. In PWM mode the hardware generates the output, you can adjust it but you shouldn't have to keep reloading it.

Brian.

 

[FvM]

You have set CCPRx > PR2 which doesn't work. You should set PR2 to 0xFF.