topic Re: MCF51JM128 get freeze on the PLL loops in ColdFire/68K Microcontrollers and Processors

MCF51JM128 get freeze on the PLL loops

michalpl — Sat, 15 Sep 2012 18:17:21 GMT

hello.

I have a demojm board with a mcf51jm128 cpu. My OS is Win7 x64, and I'm using the latest version of CW.

The problem is clock configuration function, the CPU freezes on the following loops:

while(MCGSC_IREFST != 0U)

while(MCGSC_PLLST == 0U)

while(MCGSC_LOCK == 0U)

(MCUinit.c file)

If I comment these lines the CPU is working correctly.

How to solve that problem? If It's needed I can send you a clock configuration preset from CW (*.dev file).

Thanks.

Edit:

I upload preset screenshot and Processor Expert dev file.

edit:

Original Attachment has been moved to: preset.dev.zip

kef — Sun, 16 Sep 2012 10:24:43 GMT

Looks like your crystal oscillator doesn't start.

michalpl — Sun, 16 Sep 2012 10:52:31 GMT

I'm using the default quartz on the DEMOJM Board.

Changing External oscillator to External crystal nothing change. The CPU is looping on the "/* Wait until external reference is stable */" loop.

IT WORKS ;-)

You must change the "external ref clock for peripherials" to enable state.