32-bit AVR with 50 MHz — where the cycle budget lands
The AT32UC3L0256-AUT is a 32-bit AVR single-core microcontroller from Microchip's AVR®32 UC3 L series, running at 50 MHz with 256 KB of on-chip Flash and 32 KB of RAM. It is housed in a 48-TQFP package (7x7 mm) and targets embedded control applications that need a deterministic 32-bit pipeline without the peripheral overhead of a Cortex-M class part. The 50 MHz clock delivers roughly 50 MIPS in single-cycle execution — a 25% speed margin over the 40 MHz PIC32MX130 peer, which matters for tight control loops or software UART bit-banging.
Memory sizing and peripheral set for control apps
256 KB Flash (256K x 8) and 32 KB RAM (32K x 8) are enough for a modest RTOS, a TCP/IP stack, and a few hundred lines of application code — typical for motor control, sensor fusion, or human-machine interface panels. The 36 general-purpose I/O lines, plus I²C, SPI, and UART/USART connectivity, cover most sensor and actuator interfaces without external expanders.
The supply range of 1.62 V to 3.6 V covers both 1.8 V and 3.3 V logic rails, simplifying dual-voltage designs.
It is ROHS3 compliant.