According to the PICkit 5 Docs, Dx/Ex parts support SPI ISP...

[MX682X]

Has anyone ever tried to see if that works? It would be intresting if this is true...

https://ww1.microchip.com/downloads/aemDocuments/documents/DEV/ProductDocuments/UserGuides/MPLAB-PICkit-5-In-Circuit-Debugger-Users-Guide-50003525.pdf (page 30)

[SpenceKonde]

If anyone makes this work I'll eat my hat. (US ideom: that claim is laughable and has no chance of being true, so I can confidently offer to do something ridiculous like that if it were, because i am just that certain its not). I wouldn't trust that claim. Its ludacris and directly contradictory to the datasheet and every other piece of information regarding these devices. Furthermore, even if we knew something like that existed, we couldn't implement it without an aggressive spy campaign using a working debugging setup, where it was known to work (since i dont think it is actually a thing, i dont expect any volunteers). But to do anything with this you would need significant spying on the communications to understand how the new features not present on classic avrs were implemented. I'll ask my guy on the inside about it and get my usual reply of chirping crickets.

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On Thu, Jul 27, 2023, 14:57 MX682X ***@***.***> wrote: Has anyone ever *tried* to see if that works? It would be intresting if this is true... https://ww1.microchip.com/downloads/aemDocuments/documents/DEV/ProductDocuments/UserGuides/MPLAB-PICkit-5-In-Circuit-Debugger-Users-Guide-50003525.pdf (page 30) [image: image] <https://user-images.githubusercontent.com/58419867/256637548-23ff9c1d-97f1-4fcc-98a4-966af028374e.png> — Reply to this email directly, view it on GitHub <#462>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTXEWYE3BKNLI4KM6NENVLXSK2ZJANCNFSM6AAAAAA22QA7MU> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[MX682X]

I'd say it exists. Datasheets's a bit too new. The documents are probably written by different departments, and somone forgot about a memo.

However, we have to figure out more then just the protocol. We would also have to figure out which pins are used for it.
I thought it would be easier then that.

I suspect they decided to add this feature for backward compatibility (Arduino) but then found some problems with it and decided to remove it from the documents, after all UPDI is more intresting. But, as making new layout is expensive in money and time, it still sits somewhere on the die. Maybe they couldn't tear it out without significant problems or it's too smal to matter.

[SpenceKonde]

Possible - certainly far from unprecedented (ref: MULFACT on Dx can go to 4k for the PLL, internal oscillator has a 32MHz setting on Dx, and so on). But I also would not be the least bit surprised if that was a screwup in the docs.

Betcha if it does exist, it uses the default pins of SPI0, except you use reset like SS - just like classic AVRs.