D_CLKOUT Frequency Tolerance MPC5674F

[CNarendra]

Hi,

Could you please confirm the frequency tolerance of the EBI D_CLKOUT signal on the MPC5674F? We couldn't find this detail in the datasheet or reference manual.

Thanks,
Narendra C

MPC5674F ,#EBI 

[davidtosenovjan]

The D_CLKOUT signal is derived from the system clock via the FMPLL.
While the nominal frequency of D_CLKOUT can be configured, the tolerance depends on the accuracy of the external oscillator used as the PLL reference.

[CNarendra]

Hi @davidtosenovjan ,

Is there any frequency tolerance introduced by the microcontroller itself, aside from the external crystal?

- Narendra.C

[davidtosenovjan]

Actually DS specifies directly CLKOUT jitter:

davidtosenovjan_0-1748007310344.png

[CNarendra]

Whether CLKOUT jitter value can be considered as FCLKOUT tolerance?

-Narendra 

[davidtosenovjan · Accepted solution]

You can consider it as PLL contribution (worst case) to XOSC tolerance.