https://github.com/spencekonde/avr_research

"Late to bed and early to rise, work like hell and advertise." Wait, it's supposed to be *early* to bed? Oh dear. My score's not looking so great is it?
https://github.com/spencekonde/avr_research

avr avrda avrdb avrdd tinyavr-1 tinyavr-2

Last synced: about 2 months ago
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"Late to bed and early to rise, work like hell and advertise." Wait, it's supposed to be *early* to bed? Oh dear. My score's not looking so great is it?

• Host: GitHub
• URL: https://github.com/spencekonde/avr_research
• Owner: SpenceKonde
• Created: 2021-06-08T08:41:42.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2024-09-17T10:11:17.000Z (4 months ago)
• Last Synced: 2024-09-17T12:46:59.243Z (4 months ago)
• Topics: avr, avrda, avrdb, avrdd, tinyavr-1, tinyavr-2
• Language: Python
• Homepage:
• Size: 8.59 MB
• Stars: 8
• Watchers: 4
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md

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README

        
# AVR_Research

Investigations of AVR microcontrollers

This is where I will put anything I turn up while digging around maintaining my cores that I think may be of wider interest.

## The secrets of the signature row

Many of the undocumented bytes of the 64-byte sigrow on the tinyAVR 0/1/2-series parts are 0xFF (blank). There appears to be a 16-bit checksum. 

While preparing [ATtiny1624 boards for sale](https://www.tindie.com/products/17598/), I ran the tuning sketch on all of them - and had it log the full sigrow. There are two unknown constants, and four unknown bytes with non-blank values on the ATtiny1624.

[known information](sigrow/README.md)

## Mysteries

These are things not adequately explained or where there is an inconsistency within the datasheet, and I am not aware of anyone having tried to sort out how the part(s) actually behave. This is concerned primarilly with the modern AVR parts in general, though a few notes relating to classic tinyAVR devices may be listed. 

Be sure to let me know if you know anything about this, and I'll move it to a solved mysteries page, with the answer and - if you want it - your name and a link to your website. If not specified, I'll credit github usernames. 

[Unsolved Mystery list](UnsolvedMysteries.md)

Anyone providing a proper investigation of the 828 ADC mystery has definitely earned some hardware, in addition to the prestige.