Matrix user forums

Sorry if this sounds stupid. But I am using the ECIO-40P, and for my application the crystal is too fast.
What can I do to decrease the crystal frequency to about 16MHz?? I need to use USB communication also.
When reducing the frequency can I still use the USB (D+, D-)?

Thanks

Hello,

Sorry you cannot use the USB if you lower the frequency as it needs a 48MHz clock to allow it to run at the USB speed of 12MIPs. Why do you need the chip to run slower? maybe there is a good alternative.

Hi,

I need to have a PWM frequency which is less than 200Hz, which I cannot achieve.

If I build the circuit myself, and dumping a boot-loader in the PIC will I still be able to program it
like I program the ECIO, using the "Compile to Chip" button? As if this is possible it would solve my problem.

Thanks

Hello,

There is an example available here that shows how to create a timer controlled PWM output. This could be at pretty much any frequency that you require.

http://www.matrixmultimedia.com/mmforum ... =26&t=6732