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In the context of wireless sensor nodes for the Internet-of-Things, there is a need for low-power highperformance computing cores for video monitoring applications. In this paper we present a custom 50MHz 32-bit microcontroller running at 0.37V built on a 65nm LP/GP CMOS process. Part of an energy-harvesting SoC with on-chip CMOS imager, it features adaptive voltage scaling, low-power 1.55µW sleep mode, and a variable-width SIMD pipeline and multiply/divide unit, achieving 7.7µW/MHz overall.Keywords-CMOS digital integrated circuits, VLSI, embedded microcontroller, near-threshold/subthreshold logic, system-on-chip (SoC), ultralow power, ultralow voltage, variability mitigation.

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