Jun 20, 2016
02:16 AM
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Jun 20, 2016
02:16 AM
Hello,
I want to measure time with the XMC1400 BootKit.
The timer modul CCU4 is started and stopped by external events.
If I use the internal oscillator DCO1 (48 Mhz), the jitter of the measured counts increases.
At 50 microsec the jitter is under 5 counts, but at 200 microsec the jitter is already around 15 counts.
The jitter of the counts increases nearly linear with the measured time.
I know that using a crystall oscillator solves the problem.
But which effect causes this phenomenon ?
I would expect that the jitter is constant.
Thanks
I want to measure time with the XMC1400 BootKit.
The timer modul CCU4 is started and stopped by external events.
If I use the internal oscillator DCO1 (48 Mhz), the jitter of the measured counts increases.
At 50 microsec the jitter is under 5 counts, but at 200 microsec the jitter is already around 15 counts.
The jitter of the counts increases nearly linear with the measured time.
I know that using a crystall oscillator solves the problem.
But which effect causes this phenomenon ?
I would expect that the jitter is constant.
Thanks
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- IFX
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