8-bit EFM8 8051 Microcontrollers by Silicon Labs

The EFM8 MCU family meets IoT developer needs with an unparalleled combination of features and capabilities including a high-speed pipelined 8051 core, ultra-low power, precision analog and enhanced communication peripherals, integrated oscillators, small-footprint packages, and an advanced crossbar architecture that enables flexible digital and analog multiplexing to simplify printed circuit board (PCB) design and I/O pin routing.