STM8L focuses on low power consumption. For the 15x series products, 1.8v can drive the chip to work normally, and it can be as low as 1.65v in Halt mode. The maximum operating voltage is 3.6v.
Generally, the minimum system of homemade 51 needs crystal oscillator, reset circuit and download port lead-out, but STM8L has built-in 16M (HSE) and 38k (LSE) built-in RC circuits for generating clock signals, so the external crystal oscillator is saved.
In addition, the 15x series MCUs have integrated power-on reset (POR), power-down reset (PDR) and programmable shutdown reset (BOR) functions, so there is basically no need for an external reset circuit. But for safety reasons, add a self-locking switch.
Therefore, the minimum system for making your own STM8L only needs a patch component adapter board (0.5mm pitch), a pin header, a perf board, and a self-locking switch.
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