An integrated circuit is provided comprising a processor, an onboard system clock having a ring oscillator for generating a clock signal, a memory, and clock trim circuitry. The processor is arranged to, in response to receiving an external signal, determine the number of cycles of the clock signal during...http://www.google.fr/patents/US7171323?utm_source=gb-gplus-shareBrevet US7171323 - Integrated circuit having clock trim circuitry
