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Silicon Labs CP210x: What are the functions of POR (Power-On Reset) and VDD monitor?

CP21xx

POR (Power-On Reset) is a function that resets the device when the power is turned on. VDD monitor is a protection function that detects a drop in the power supply voltage and resets the device.
The figure below is an excerpt from Silicon Labs' 8-bit microcomputer data sheet, but the operation is the same as this.

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