Risc-V MCUs have 8 to 20 pins

Called the CH32V003 series, they are based on the company’s own QingKe RISC-V2A core with a hardware interrupt stack and two-level interrupt nesting, supported by 16kbyte flash, 2kbyte ram and a ~2kbyte bootloader. There is also 64byte of non-volatile system configuration memory, 64byte of user-defined memory and a 64bit unique ID. A single-channel DMA controller is provided.

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