16 MHz, 2 KB Flash, 256 B RAM — the resource envelope
The 8-channel 10-bit ADC handles analog sensor inputs directly, while the I²C, SPI, and USI serial interfaces cover low-speed communication with peripherals like temperature sensors or EEPROMs.
Peripheral set and integration
On-chip peripherals include brown-out detect and reset (BOR), a programmable watchdog timer (WDT), PWM-capable timer, and a DMA controller. The 256-byte RAM is the tightest constraint: any data logging or communication buffer must be tiny, and stack depth needs careful budgeting during firmware development.