I am trying to disable the PST and DDATA BDM signals on an MCF5274. This is to reduce emissions.
The manual states that setting the PSTEN bit in CCR to '0' will disable these signals. The problem is that it does not work for me. This bit is always '0' no matter what I write to it and the signals are still active.
Is there something special I have to do in order to read and write this bit? (The CPU is in supervisor mode).
Regards,
Anders
PDDPAR and DDRDD registers to output GPIO. Should do what you want.
(didnt check the 527x manual, i'm only used to 521xx-525xx)
You can't disable the PST signals on this part using that register
If your concern is EMI, switch to JTAG mode as a workaround (JTAGEN)
Regards
register should be something like this
Where can I find the manual or errata that shows this?
/Anders
Will update errata manual.
Sorry for the inconveniences this might caused to you
Regards
PaoloRenzo wrote (4 years ago):
> Will update errata manual.
I can't see any updated manuals or errata for that chip.
I'm having similar problems with the MCF5235. I can't set the PSTEN pin in the CCR, so I'm suspecting it might have the same problems as the MCF5274.
Does anyone know?
Tom