ATtiny3224, ATtiny3226, ATtiny3227 8-Bit MCUs Microchip Technology ATtiny3224, ATtiny3226, and ATtiny3227 8-Bit Microcontrollers (MCUs) feature the AVR® CPU with hardware multiplier, running at up to 20MHz with 32KB Flash, 3KB SRAM, and 256B of EEPROM. These devices integrate core-independent peripherals with low-power features, including an Event System, intelligent analogue, and advanced peripherals.