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PSTCLK pin of Freescale MCF5274CVM166

Question asked by aworthi on Sep 10, 2015
Latest reply on Sep 10, 2015 by TomE

We are in the middle of EMC testing and have noticed a signal radiating from PSTCLK pin of the
Freescale MCF5274CVM166 (BGA256) microprocessor.  My understanding is this
CLK should only be active during BDM device programming.  However, when the
DBM device is not connected, we are measuring a 150 Mz signal with amplitude
3-4V (p-p).  Is there some why to disable this constant oscillation from
the PSTCLK in the software?  This is resulting in radiated emissions
levels above the allowable limit.

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