-memory space (MCU types: atmega16, atmega161, atmega162, atmega163,
-atmega164p, atmega165, atmega165p, atmega168, atmega169, atmega169p,
-atmega32, atmega323, atmega324p, atmega325, atmega325p, atmega329,
-atmega329p, atmega3250, atmega3250p, atmega3290, atmega3290p, atmega406,
-atmega64, atmega640, atmega644, atmega644p, atmega128, atmega1280,
-atmega1281, atmega645, atmega649, atmega6450, atmega6490, atmega16hva,
-at90can32, at90can64, at90can128, at90usb82, at90usb162, at90usb646,
-at90usb647, at90usb1286, at90usb1287, at94k).
-
-Instruction set avr6 is for the enhanced AVR core with 256K program
-memory space (MCU types: atmega2560, atmega2561).
+memory space (MCU types: atmega16, atmega161, atmega162, atmega163, atmega164p,
+atmega165, atmega165p, atmega168, atmega168p, atmega169, atmega169p, atmega16c1,
+atmega32, atmega323, atmega324p, atmega325, atmega325p, atmega3250, atmega3250p,
+atmega328p, atmega329, atmega329p, atmega3290, atmega3290p, atmega406, atmega64,
+atmega640, atmega644, atmega644p, atmega644pa, atmega645, atmega6450, atmega649,
+atmega6490, atmega16hva, atmega16hvb, atmega32hvb, at90can32, at90can64,
+at90pwm216, at90pwm316, atmega32c1, atmega64c1, atmega16m1, atmega32m1,
+atmega64m1, atmega16u4, atmega32u4, atmega32u6, at90usb646, at90usb647, at94k,
+at90scr100).
+
+Instruction set avr51 is for the enhanced AVR core with exactly 128K program
+memory space (MCU types: atmega128, atmega1280, atmega1281, atmega1284p,
+atmega128rfa1, at90can128, at90usb1286, at90usb1287, m3000f, m3000s, m3001b).
+
+Instruction set avr6 is for the enhanced AVR core with a 3-byte PC (MCU types:
+atmega2560, atmega2561).