| Part Family | Core supporting | Comments |
|---|---|---|
| tinyAVR 0/1/2-series | megaTinyCore | Any ATtiny ending in yz, where y is 0, 1, or 2, and z is 2, 4, 6, or 7 |
| megaAVR 0-series | MegaCoreX | Any ATmega ending in 08 (32-pin) or 09 (48-pin) |
| AVR DA/DBs-series | DxCore | AVRxxxDAyy or AVRxxxDByy, where xxx is flash in k and yy is pincount. |
| AVR DD-series | DxCore | AVRxxDDyy - pincounts of 14, 20, 28 and 32 available |
| AVR EA-series | DxCore planned | AVRxxEAyy - Unreleased. |
| Classic tinyAVR w/>= 2k flash | ATTinyCore | Excludes: t20, t40, t28L |
| Classic ATtiny13 | MicroCore | |
| Classic ATtiny15 | None | Obsolete and out of production |
| Classic ATtiny20/40 | None | Functionally obsolete. |
| Classic ATtiny28L | None | Functionally obsolete, and has no SRAM. |
| Reduced Core ATtiny4/5/10/11 | attiny10core | Reduced core parts. Disappointing peripherals, and the CPU is gimped (fewer working registers, slower execution). |
| Classic ATmega ending in 8 | MiniCore | Like 328p/pb and so on. Used in nano, uno, pro mini. All are better w/MiniCore. |
| Classic ATmega ending in 4 | MightyCore | Like the 1284p and 324pb. |
| Classic ATmega16/32/8535 | MightyCore | Predecessors to the x4-series |
| Classic ATmega8515/162 | MajorCore | Aging parts with little to recommend them. |
| Classic ATmega ending in 0 or 1 | MegaCore | ATMega64/128/640/1281/1280/2560/2561. Parts ending in 0 have 100 pins, others have 64. |
| Classic ATmega ending in 5/50 | MegaCore | 64 or 100 pin parts with scant peripheral selection. Inferior versions of above. |
| Classic ATmega ending in 9/90 | MegaCore | As with x5/x50, only those extra pins can drive arguably obsolete, rarely seen passive LCDs. |
| AT90CANxx | MegaCore | Integrated CANBUS*for automotive applications. |
| ATmega###RFR/RFR1/etc | None | Integrated radio communiction functionality, but the RF stuff isn't documented publically. RF HW design is hard and has legal complications, and the RF functionaliity uses either closed source lib or docs are hidden behind an NDA. |
| ATmega16HV/32HVA/HVB/HVrev2 | None | For controlling LiPo charging up to 4S. Scant documentation and evidence of bugs and repeated redesign. Just buy a balancing charger board. |
| ATA (ATAutomotive) | None | Little info available, and what is avaiable implies that they are not a good fit for hobbyists. Often the |
| AT90_____ not AT90CAN | None | Older parts, each family with a confusing peripheral (either USB or a fancy timer similar to modern TCD called a PSC |
| ATmega16M1/32M1/64M1,32/64C1 | None, sadly | Never sure why nobody made a core for these. |
* CANBUS is a very complicated automotive network which is used almost universally in modern vehicles. Understanding how to work with it is no small feat. While external CANBUS IC's exist, the complexity of the CANBUS protocol makes these difficult to work with because everything has to be serialized and deserialized through SPI, and so it is preferred to use parts with an integrated . It might as well stand for "Confusing Automotive Network But Ubiquitous, Still"
This family is the only set of parts that I think "deserves" a core and doesn't have one. The xxM1's absolutely beat the stuffing out of almost every other classic AVR in a 32-pin package, with the exception of the 328PB, where experts could argue about the relative merits. Every other classic AVR attempted to compete with the the 64M1 or even 32M1 will meet humiliating defeat on almost any metric. What makes the lack of a core even more surprising is that most of what is needed is straightforward, not hard to do. I think it would just be a matter of leg-work to get them working. If anyone is interested in doing this, start from MiniCore, adjust variants, tweak wiring_analog to use the slightly fancier ADC - especially if you wanted to implement all the fancy features (it's got differential capability and all that good stuff, see ATTinycore v2.0.0-dev variants for how I suggest handling differential ADC). Some of these parts have CANBUS support as well (I think this can be stolen from the libraries that use CANBUS on the AT90CAN parts, with little or no modification.
If someone else were to get most of it working, I would be happy to advise and would even be willing to add the code for PSC PWM via analogWrite (I will have an easier time than most, as I've worked so much with the similar TCD), ADC tweaks, and if you asked nicely, I could even try to make the LIN-USART work in USART mode (for the other things, as long as you're doing the legwork of setting up and maintaining the rest of the core, I'll implement them even if you ask me rudely. The LIN-USART looks little harder.