Why do clocks use 32.768K crystals?

2024/07/23

Why is there a variety of options for the external crystal of the microcontroller, and the clock crystal is 32.768K?

Clock frequency is a very important concept. If the system uses an external crystal oscillator, based on the external crystal oscillator, there are two ways of frequency multiplication or frequency division to help us obtain other clock frequencies.

In the clock system, the second is an important time unit, 1 second is 1Hz, if you want to improve the time accuracy, then this 1Hz must be accurate.

We know that in the digital world, there are only two possibilities, 0 and 1. [sensitive words] look at a calculation:

　　2^15 = 32768 = 32.768K

The 15th power of 2 is exactly equal to 32768. On the other hand, if the clock frequency of 32.768K is divided by 15 times, the obtained frequency is exactly 1Hz.

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