Microcontroller system and operating method for secure device locking using counter and timer
US7653837B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2005 |
| Grant date | Jan 26, 2010 |
| Priority date | — |
| Expiry date | Oct 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/24152
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A microcontroller system includes a microcontroller, a device which is controllable by the microcontroller, and a monitoring device. Under the control of a normal operation program, the microcontroller outputs a normal operation indicating signal. If the normal operation indicating signal is absent, the monitoring device transfers the device into a secured state and, if it is absent over a predefined period of time, locks the device in that state. When predefined exceptional conditions occur, the microcontroller changes to an operation preparation program, and the monitoring device increments a register. If the contents of the register reach a predefined value, the monitoring device locks the device in the secured state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.