QuoteThe datasheet also implies that the external-reset signal is directly connected to pin PC6No it don't imply anything. the same physical pin can be used as either an external reset OR a GPIO pin 6 on port C. What it actually is can be determined by the fuse setting.
The datasheet also implies that the external-reset signal is directly connected to pin PC6
If it were otherwise, then why would a pull-up resistor be necessary?
Adding a reversed biased diode across the reset pull-up resistor 'cures' the symptom.
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