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PLL

PLL refers to frequency multiplier, used to double the frequency.

In the ARM data sheet, the PLL is called a frequency multiplier. As the name implies, it can double the frequency. If it is used to double the frequency of an external 12M crystal, the system can work at a clock frequency of 48MHz.

PLL

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Introduction

Phase locked Loop is an analog clock-locking circuit. Compares two clock signals and aligns the two. Used for synchronizing and zero-delay buffering plus division and multiplication of frequency.

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