you can trim the RTC with "adjust" nearly to 1msec. But this internal R/C OSC
is somewhat influenced by voltage and temperature. So it can be so precise
and sufficient for most Systick purposes. And this is also true for the other
internal R/C osc. For a very precise timing you always need an external XTAL.
is somewhat influenced by voltage and temperature. So it can be so precise
and sufficient for most Systick purposes. And this is also true for the other
internal R/C osc. For a very precise timing you always need an external XTAL.