Yes I'm aware of that. I thought the datasheet stated an input rise and fall time of 10ms. That's why I chose the digitalPulse anyway - creating a cueue would be too much of a hassle. However, reading the datasheet again, I see it says 10 ns :) I guess a double-digitalWrite should be fine.
I guess the first step for interfacing with the si4703 is getting the registers out one by one, using the subaddress-examples found here. I'll let you know when I get lost...
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