RX/TX-Sequencer with 28V relay driver

This is built with an ATtiny214, doing sequencing in code running on the CPU and step-up voltage regulation with the core independent peripherals, like demonstrated in a previous post here.
The power drawn by the relay is monitored and the TX and PA outputs does not become activated if the relay isn’t functioning.
Schematics and layout in KiCAD format and source code is available here: https://github.com/danupp/boost_sequencer
An article describing the project was published in Dubus 3/2021. Unfortunately the wrong version of the block diagrams was printed – the correct ones below better describes the functionality:

The sequence of the signals is as follows:

Here is a movie showing the first prototype (an earlier version than the one described) with very slow sequencing:

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