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AN60631 - PSoC® 3 and PSoC 5LP Clocking Resources | Cypress Semiconductor

AN60631 - PSoC® 3 and PSoC 5LP Clocking Resources

Last Updated: 
May 25, 2017

AN60631 covers PSoC® 3 and PSoC 5LP's highly versatile and reconfigurable clocking system. This application note describes PSoC 3 and PSoC 5LP's oscillators and clock sources, phase-locked loop (PLL), and clock distribution network. However, it does not cover the details of the external crystal oscillators (ECOs). For those details, see AN54439 - PSoC® 3 and PSoC 5LP External Crystal Oscillator.


Clocks play a critical part in microcontroller operation. They are used to synchronize internal signals, ensure error-free communication with other digital devices, and drive the conversion of signals to and from the analog domain. These roles make the configuration of the different clocks used inside of a microcontroller very important.