AnsweredAssumed Answered

MCF52259 PSTCLK/TCLK emissions

Question asked by Carl Norman on Sep 25, 2016
Latest reply on Sep 26, 2016 by Carl Norman

Hi All,

 

I have been doing some emissions testing and PSTCLK/TCLK pin is causing us to fail (80Mhz fundamental).

 

I have JTAG_EN low (we dont use JTAG). This trace between pin 43 (LQFP) and the debug header is just acting as an antenna and radiating 80Mhz. 

 

I dont want this pin oscillating unless the debugger is attached, how do I stop this pin unless the debugger / programmer is attached? Or, what is the ideal way to stop it radiating so much noise.

Outcomes