IBD: Arduino Mega 2560 reset-related groups overview

High level view of reset-related aspects:
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To keep things a bit compact, the DSL stereotypes «pin» and «node» are not shown here, but their icons are:

Also, the multiplicities are not shown on the Ports or net nodes (and are assumed to be 1).

A board reset can be performed via the reset button, via a pin on :Header3, or via ICSP.

The SPI connections (MOSI/MISO/SCK) between one ICSP header and the main mcu ATmega2560 chip are not directly relevant to the reset, there's just shown anyway.

A board reset ultimately also affects the ATmega16U2 chip via DTR/HWR to its p13.

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