ATSAMD specifics

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Reset extension phase

When nRESET is released and the SWCLK/TCK pin is low, the MCU enters the so-called "Reset extension phase". In this phase the CPU does not execute any code.


When manually toggling the reset pin (e.g. in a production test), it is necessary to pull the SWCLK/TCK pin up, before releasing nRESET:

This ensures that the reset behaves as expected.