STM CircleOS forum / PCLK1 too high after shutdown

sgersten · 2010-04-12 13:57:27

Hi,

I'm experiencing an interesting behaviour of my Primer2. After shutdown it will start with a higher beep frequency and I also found out that the PCLK1 seems to be 3 times higher than expected. I used TIM3 to generate a wave and it is running 3 times faster. This does also happen when I don't start my App, but if I only start the main menu of Circle OS 3.8.
Any ideas?

Thanks,
Stefan

Francis · 2010-04-13 12:42:26

Depending of the speed configuration, the timers reload values are adpated to the CPU clock. We didn't find any bug in this mechanism until now. Now, the 'beep' is generated by the audio codec, that is clocked by the MCO (12MHz). Would the MCO be wrong ... To be checked. Could you send an application that shows the issue ?

# 1 2010-04-12 13:57:27 PCLK1 too high after shutdown

PCLK1 too high after shutdown

# 2 2010-04-13 12:42:26 PCLK1 too high after shutdown

Re: PCLK1 too high after shutdown

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