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Espressif ESP32-S3

The ESP32-S3 is Espressif's dual-core WiFi and Bluetooth LE microcontroller, built around two 32-bit Tensilica Xtensa LX7 cores at up to 240MHz. The LX7 keeps the windowed Xtensa register file, the variable-length 24-bit and 16-bit (density) encodings, L32R literal loads and the zero-overhead loop, and adds vector and DSP extensions used for AI and signal work. It integrates SRAM, cache-mapped external SPI flash, a rich GPIO matrix, UARTs, USB and the WiFi and BLE radios. Here it runs real bare-metal firmware on a from-scratch Xtensa LX7 interpreter, sharing the Xtensa core with the ESP32 (core0 only; WiFi and BLE stubbed).