PWM in 12F683?

[MikeMl]

Using the 31kHz RC clock in a 12F683, can I run the CCP PWM such that the Period is 30.4Hz (2bits of Fosc concatenated with the 8 bits in PR2)? That is 31000/(4*255), which is a period of ~33ms?

If so, does than allow me to control the PW from (0/1024)*33ms to (1023/1024)*33ms using 8bits in CCPRL1 concatenated with CCP1CON<5:4>?

 

[languer]

I have to believe that if you are running on the 31kHz RC, then the answer is yes.

You could get the full 10-bits by using the 1:1 prescaler [31000/(1*1020)]

 

[MikeMl]

Good, I'm building a battery charger for lead-acid batteries, and want to use the PWM to control the average voltage level across the battery terminals. Running at ~30Hz is fine for this application. I will make the PW inversely proportional to the difference between the actual battery voltage, and the desired temperature based on ambient temperature.