topic Crystal for MC56F82743 in Digital Signal Controllers

Crystal for MC56F82743

miroslavmartise — Thu, 05 Nov 2015 09:55:49 GMT

Hello everybody,

I have decided to use DSC MC56F82743 in 32-pin LQFP package for my next project recently, but a small problem has appeared - I don't know where I should connect external crystal for this circuit? I cannot find suitable pins in datasheet..... I would like to avoid using internal oscillator.

Could somebody give me an advice to solve this problem, please?

Thank you a lot.

Miroslav from Czech Republic

Re: Crystal for MC56F82743

johnlwinters — Thu, 05 Nov 2015 19:59:30 GMT

Please use pin four for the oscillator module to connect to. No cyrstal can be used.

Please read reference manual (RM) section 18.

Example:

"18.2.4 External Clock Source - CLKIN - pin 4

In this mode, an external clock is applied using the external CLKIN pin function. This is

propagated into the OCCS and OCCS is configured to select CLKIN as the clock source."

Re: Crystal for MC56F82743

miroslavmartise — Fri, 06 Nov 2015 07:20:37 GMT

Hello John,

thank you a lot for your promt advice. I have usually used external crystal with other DSCs, but this circuit in such small package poses for me something new.

So, I will apply stand-alone sillicon oscillator.

Have a nice day!