8 KB Flash — firmware budget for sensor/control apps
8 KB of Flash (8K x 8) is the code-space ceiling. The 256-byte RAM (256 x 8) limits data buffering — plan for register-based processing rather than large frame buffers. The Flash is field-reprogrammable, so firmware updates are possible if the bootloader fits in the remaining space.
Peripherals — BOD, DMA, PWM, WDT plus I²C/SPI/USI
The peripheral set reduces external BOM. The brown-out detect and POR handle power-up sequencing; the DMA engine moves data between USI and RAM without CPU intervention. The PWM timer can drive a half-bridge or LED dimmer directly. The USI module supports I²C and SPI in hardware — no bit-banging needed for common sensor interfaces. The watchdog timer provides a safety net for unattended operation.
For volume purchases or long-term supply agreements, the RFQ process can lock in allocation windows.