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STMicroelectronics STM8S105

The STM8S105 is an STMicroelectronics microcontroller built around the 8-bit STM8 CISC core: an 8-bit accumulator, two 16-bit index registers (X and Y), a 16-bit stack pointer and the condition-code register, with a variable-length big-endian instruction set. It carries GPIO ports, timers, a UART and an ADC, and is the microcontroller on the low-cost STM8S-Discovery evaluation board. Here it runs real hand-assembled STM8 firmware on a from-scratch STM8 core.