PWM selection; how does PIC do so many functions?
- Okay guys, thanks for your help on PWM verse ADC. I surely see PWM is
the better choice. One particular aspect I liked is the impulse the
motor will "feel" every period. I like this... anyway, I have another
I am looking to buy a microcontroller with an internal PWM on
board. One that will just output a PWM signal on its own instead of
you programming the interrupts and stuff. My guess is you simple write
an 8 or 10 bit number to a register and the PWM adjusts automatically.
Anyways, I am finding it difficult to locate just what I want. I am
looking at PIC microcontrollers and in one instance it will say this
particular chip has 4 PWM and then in another it says only one, and
then finally there is another that says none. I am thinking of using
the PIC becuase they are so cheap. Like 5 bucks for a microprocessor
that has quite a few functions. So my first question is this: Any way
for me to determine absolutely how many of these PWM are on the chip.
The information really seems to be quite vague. Maybe someone can
I also had seen a few microcontrollers from PIC that had like
only 8 pins. 2 are for input power leaving only 6 pins. I know the
chip has a ton of functions that would use more than 6, like mutliple
output, not too mention some interrupts and other stuff. I can see the
pins having multiple functions but I can't see having a dedicated
output being used as another function. Do they expext the user to
attach some sort of multiplexer? Or is all the microprocessor data
serially output and you have to sort through the serial data to update
pins and what not? Or do you have really limited choices where once
you select a particular pin to say be a dedicated input, it is that
and cannot be used as the other functions designated for that pin,
unless of course you rewrite the control data for that pin.
Okay, thanks and sorry about the lengthy post.