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His work is amazing, unfortunately he doesn't explain what those things are, apart from ISR and SPDR. And I had no idea from where the other things came. But there are already good answers that give me somewhere to look into. Thank you very much!João Costa– João Costa2018-02-08 15:09:53 +00:00Commented Feb 8, 2018 at 15:09
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I also explain SPI right here on this site: arduino.stackexchange.com/questions/16348/… - As for the register names, they are explained in the datasheet.Nick Gammon– Nick Gammon ♦2018-02-08 20:32:58 +00:00Commented Feb 8, 2018 at 20:32
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Whilst I have a personal interest in the answer, it simply isn't practical to include or even summarize a lengthy post like an explanation of how SPI works. The OP is asking for documentation and this answer is giving a link to it. In my comment above I point out that there is more documentation available on this site which means it is less likely to go link-dead. Another answer might be to reference the datasheet, which again would have to be link-only, unless maybe you quoted a couple of pages.Nick Gammon– Nick Gammon ♦2018-02-08 20:57:33 +00:00Commented Feb 8, 2018 at 20:57
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