System and method for selecting a clock
US11644504B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2020 |
| Grant date | May 9, 2023 |
| Priority date | — |
| Expiry date | Nov 28, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In accordance with an embodiment, a system includes an oscillator equipped circuit having an oscillator control circuit configured to be coupled to an external oscillator and a processing unit comprising a clock controller. The clock controller includes an interface circuit configured to exchange handshake signals with the oscillator control circuit, a security circuit configured to receive the external oscillator clock signal and configured to select the external oscillator clock signal as the system clock, and a detection block configured to detect a failure in the external oscillator clock signal. Upon detection of the failure, a different clock signal is selected as the system clock and the interface circuit to interrupts a propagation of the external oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.