ONiO.zero offers a RISC-V Microcontroller that runs without battery
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[1] - https://en.wikipedia.org/wiki/Near-field_communication#Desig...
RISC: "Reduced instruction set computer"
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The distinction between "reduced" (RISC) and "complex" (CISC) is more philosophical than "number of instructions."
Even as the RISC-V specification gains new instructions, the modular design of the architecture is specifically designed to allow implementations to pare down to just the subset they need.