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MC13224 and Low Power Mode

Question asked by Nicolas Houarche on Feb 24, 2010
Latest reply on Mar 18, 2010 by dean sharples

Hi everybody

 

I encountered a problem with MC13224 integrated on a board.

All was OK (RF, UART communication...) since the board turned off (the LED controled by the micro switched of). I checked power supplies. I then tried to reload the program into the micro but I got two types of error message :

 

"TCK (pin 9) low, but should be high. Please check target hardware" and "target VCC failure. Please check target voltage. Could not find supported CPU core on JTAG chain"

&

"Could not find supported CPU core on JTAG chain
Bad Jtag communication: Write to IR: Expected 0x1, got 0x0 (TAP Command : 2)
@ Off 0x5.
Unable to halt ARM core"

 

I sent an email to technical support. I have been told that the micro might be in Low Power Mode. I read the datasheet to get information about this mode and I learnt that there are only software ways to entry this mode: DOZE or HIB bits in SLEEP_SYNC should be set. I checked and they are both to zero. Thus, I am not really sure the micro is in Low Power Mode. Maybe another way exist (?)

 

Furthermore, this problem appeared on several boards but not on all. I then compared crystal signals from a safe board and from the dead one. These signals are the same.


Does someone can help me ? Many thanks.

Houarcheneger.

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