2396034_en-US

[#1]

MPC5746C FXOSC output frequency

Part: MPC5746C (Power Architecture Z4, SDK: NXP MPC57xx platform SDK).
In the manual of MPC5746C, it is stated that FXOSC provides 8 -40 MHz output frequency. Please help me in finding the output frequency provided by FXOSC for the following configurations?
1. FXOSC_CTL: OSCBYP = 0 and OSCM = LCP

2. FXOSC_CTL: OSCBYP = 0 and OSCM = FSP

3. FXOSC_CTL: OSCBYP = 1 and OSCM = LCP

4. FXOSC_CTL: OSCBYP = 1 and OSCM = FSP

Please consider default values for the other register fields. Thanks.

Re: MPC5746C FXOSC output frequency

Thanks for your response @petervlna. 

How can we find the frequency provided by the crystal/resonator(OSCBYP = 0) and external clock(OSCBYP = 1)?

Re: MPC5746C FXOSC output frequency

Hello,

The FXOSC module does not generate a specific frequency based on the OSCBYP and OSCM settings. The FXOSC output frequency is always equal to the frequency of the external source connected to FXOSC (crystal/resonator when OSCBYP=0, or external clock when OSCBYP=1), within the supported range of 8–40 MHz.

Therefore, for all four configurations listed, the FXOSC output frequency is simply the external input frequency. The OSCM setting (LCP/FSP) affects the oscillator operating mode, but does not change the clock frequency.

Best regards,

Peter

Re: MPC5746C FXOSC output frequency

@petervlna please provide your support for my FXOSC query mentioned above.