Crystal for MC56F82743

[miroslavmartise]

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

[miroslavmartise]

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!

[johnlwinters]

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."