Schematic DIY KitClock IC, PLL, resonators
No microcontroller or DSP circuit does not require clock / clock generator.
But for watches etc you need a reference for a stable clock.

These different functional principles can be applied:
Classic crystal oscillators, RC oscillators, ceramic resonators, to name a few. Each circuit has its preferred area of application. Here are some interesting links to clock generator circuits

Here you will find Schematic Circuit Diagram for DIY and further information on Clock
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1Hz oscillator knollep.de/Hobbyelektronik/projekte/21/index.htm
Simple clock with NE555 www.loetstelle.net/projekte/ne555univ/ne555univ.php
E-cube with clock generator www.harald-sattler.de/html/body_elektronische_wurfel.htm

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