In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

It has to do with the level of bypass capacitors used, they take time to charge, and the SX cant run at 50MHz at the lowest voltage it can run at (~2.7V), so if the normal waiting period before execution occurs and the voltage isnt high enough to permit 50 mhz operation the SX will hang. The BOR setting will force the SX into reset (plus some additional time) until the voltage levels rise enough to permit full 50mhz operation.

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