I want to know priority of Cortex-M3 processor

which interrrupt priority is higher?

systick vs IRQ(external timer)

because In my case externl timer is higher then systick.

I saw that during processing in systick ISR, but  suddenly pc jump to timer ISR

so  I experimented print out. systick print letter is broken. but timer print is out correctely

I think that systick priority is higher than external timer

why this situation is occured?

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