MPC5674F external oscillator

vincentbbbb — Tue, 03 Apr 2018 15:15:53 GMT

Hello,

I was wondering how to use an external oscillator generated from a function generator. I saw in the spec sheet that the PLL Mode is OFF and that the oscillator is connected to EXTAL pin. What kind of wave I have to provide?? square, sine???

Also, what is the maximum and minimum voltage values for this signal.

Regards,

Re: MPC5674F external oscillator

davidtosenovjan — Wed, 04 Apr 2018 08:42:27 GMT

Hi, specifically, in “PLL Off Mode” it must be full swing square wave clock input. In “Normal Mode” it is not so strictly defined, however square wave is expected output of external crystal oscillator.

In any case duty cycle of 50% is expected. EXTAL signal must fulfil voltage level defined by specifications VIHEXT, VILEXT

Sometimes minimum edge length is being required for input clock, however that's apparently not the case of this device, where I haven’t found such requirement.

MPC5xxxのトピックMPC5674F external oscillator

MPC5674F external oscillator

Re: MPC5674F external oscillator