Clocking system for microcontrollers
US6167527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1999 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Jul 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00361
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved clocking system for micro controllers is provided. The micro controller has two mechanisms by which the clocking is provided. One clock is provided by an external clock signal which is generally crystal controlled. A second mechanism for providing the clock is also present. This second clock can be useful as the "primary" or first clock which is generally a crystal oscillator may take several milliseconds to stabilize following a restart from a stop mode. The second clock mechanism can for example be an internal ring oscillator or other type of clock which although not as accurate as a crystal clock does not require the several milliseconds to recover.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.