PWM with timer2 in P16F877 - Electronic Circuits Projects Diagrams Free

david_mora · 30th January 2004, 07:18 PM

hi people, i have a question, i'm trying to covert a simple analog signal into a pwm signal using a PIC 16F877. It means that if the voltage in CH5 (RE0) is 5V, the duty cycle is 100% but if the voltage is 0V the duty cycle is 0%. I used the PWM module but the quentios is this: do i have to disable the CCP1 to chenge the duty cycle (CCPR1L)??

**Nigel Goodwin** · 30th January 2004, 10:14 PM

Quote:

Originally Posted by david_mora

hi people, i have a question, i'm trying to covert a simple analog signal into a pwm signal using a PIC 16F877. It means that if the voltage in CH5 (RE0) is 5V, the duty cycle is 100% but if the voltage is 0V the duty cycle is 0%. I used the PWM module but the quentios is this: do i have to disable the CCP1 to chenge the duty cycle (CCPR1L)??

No, all you need to do is write to the register, it updates when it next outputs the pulse.

sunil patel · 5th February 2004, 03:59 AM

i think you should use the ic sg3525a , this ic is capabel of working with 8 to 35 v andcan provide you the continuous pwm output.

sunil patel
contact_sunilpatel@yahoo.com

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30th January 2004, 07:18 PM	(permalink)
david_mora	PWM with timer2 in P16F877 hi people, i have a question, i'm trying to covert a simple analog signal into a pwm signal using a PIC 16F877. It means that if the voltage in CH5 (RE0) is 5V, the duty cycle is 100% but if the voltage is 0V the duty cycle is 0%. I used the PWM module but the quentios is this: do i have to disable the CCP1 to chenge the duty cycle (CCPR1L)??

5th February 2004, 03:59 AM	(permalink)
sunil patel	i think you should use the ic sg3525a , this ic is capabel of working with 8 to 35 v andcan provide you the continuous pwm output. sunil patel contact_sunilpatel@yahoo.com