avr2
     ``Classic'' devices with up to 8 KiB of program memory.

     MCU = attiny22, attiny26, at90c8534, at90s2313, at90s2323, at90s2333, at90s2343, at90s4414, at90s4433, at90s4434, at90s8515, at90s8535.

avr25
     ``Classic'' devices with up to 8 KiB of program memory and with the MOVW instruction.

     MCU = ata5272, ata6289, attiny13, attiny13a, attiny2313, attiny2313a, attiny24, attiny24a, attiny25, attiny261, attiny261a, attiny43u, attiny4313, attiny44, attiny44a, attiny45, attiny461, attiny461a, attiny48, attiny84, attiny84a, attiny85, attiny861, attiny861a, attiny87, attiny88, at86rf401.

avr3
     ``Classic'' devices with 16 KiB up to 64 KiB of  program memory.

     MCU = at43usb355, at76c711.

avr31
     ``Classic'' devices with 128 KiB of program memory.

     MCU = atmega103, at43usb320.

avr35
     ``Classic'' devices with 16 KiB up to 64 KiB of program memory and with the MOVW instruction.

     MCU = ata5505, atmega16u2, atmega32u2, atmega8u2, attiny1634, attiny167, at90usb162, at90usb82.

avr4
     ``Enhanced'' devices with up to 8 KiB of program memory.

     MCU = ata6285, ata6286, atmega48, atmega48a, atmega48p, atmega48pa, atmega8, atmega8a, atmega8hva, atmega8515, atmega8535, atmega88, atmega88a, atmega88p, atmega88pa, at90pwm1, at90pwm2, at90pwm2b, at90pwm3, at90pwm3b, at90pwm81.

avr5
     ``Enhanced'' devices with 16 KiB up to 64 KiB of program memory.

     MCU = ata5790, ata5790n, ata5795, atmega16, atmega16a, atmega16hva, atmega16hva2, atmega16hvb, atmega16hvbrevb, atmega16m1, atmega16u4, atmega161, atmega162, atmega163, atmega164a, atmega164p, atmega164pa, atmega165, atmega165a, atmega165p, atmega165pa, atmega168, atmega168a, atmega168p, atmega168pa, atmega169, atmega169a, atmega169p, atmega169pa, atmega26hvg, atmega32, atmega32a, atmega32c1, atmega32hvb, atmega32hvbrevb, atmega32m1, atmega32u4, atmega32u6, atmega323, atmega324a, atmega324p, atmega324pa, atmega325, atmega325a, atmega325p, atmega3250, atmega3250a, atmega3250p, atmega3250pa, atmega328, atmega328p, atmega329, atmega329a, atmega329p, atmega329pa, atmega3290, atmega3290a, atmega3290p, atmega3290pa, atmega406, atmega48hvf, atmega64, atmega64a, atmega64c1, atmega64hve, atmega64m1, atmega64rfa2, atmega64rfr2, atmega640, atmega644, atmega644a, atmega644p, atmega644pa, atmega645, atmega645a, atmega645p, atmega6450, atmega6450a, atmega6450p, atmega649, atmega649a, atmega649p, atmega6490, atmega6490a, atmega6490p, at90can32, at90can64, at90pwm161, at90pwm216, at90pwm316, at90scr100, at90usb646, at90usb647, at94k, m3000.

avr51
     ``Enhanced'' devices with 128 KiB of program memory.

     MCU = atmega128, atmega128a, atmega128rfa1, atmega1280, atmega1281, atmega1284, atmega1284p, at90can128, at90usb1286, at90usb1287.

avr6
     ``Enhanced'' devices with 3-byte PC, i.e. with more than 128 KiB of program memory.

     MCU = atmega2560, atmega2561.

avrxmega2
     ``XMEGA'' devices with more than 8 KiB and up to 64 KiB of program memory.

     MCU = atmxt112sl, atmxt224, atmxt224e, atmxt336s, atxmega16a4, atxmega16a4u, atxmega16c4, atxmega16d4, atxmega32a4, atxmega32a4u, atxmega32c4, atxmega32d4, atxmega32e5, atxmega32x1.

avrxmega4
     ``XMEGA'' devices with more than 64 KiB and up to 128 KiB of program memory.

     MCU = atxmega64a3, atxmega64a3u, atxmega64a4u, atxmega64b1, atxmega64b3, atxmega64c3, atxmega64d3, atxmega64d4.

avrxmega5
     ``XMEGA'' devices with more than 64 KiB and up to 128 KiB of program memory and more than 64 KiB of RAM.

     MCU = atxmega64a1, atxmega64a1u.

avrxmega6
     ``XMEGA'' devices with more than 128 KiB of program memory.

     MCU = atmxt540s, atmxt540sreva, atxmega128a3, atxmega128a3u, atxmega128b1, atxmega128b3, atxmega128c3, atxmega128d3, atxmega128d4, atxmega192a3, atxmega192a3u, atxmega192c3, atxmega192d3, atxmega256a3, atxmega256a3b, atxmega256a3bu, atxmega256a3u, atxmega256c3, atxmega256d3, atxmega384c3, atxmega384d3.

avrxmega7
     ``XMEGA'' devices with more than 128 KiB of program memory and more than 64 KiB of RAM.

     MCU = atxmega128a1, atxmega128a1u, atxmega128a4u.

avr1
     This ISA is implemented by the minimal AVR core and supported for assembler only.

     MCU = attiny11, attiny12, attiny15, attiny28, at90s1200.