Power-up reset conditioned on direction of voltage change
US5203000A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1990 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Nov 15, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1415
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system which includes a microprocessor (or microcontroller) and an auxiliary chip which monitors the system power supply voltage and performs related functions for the microprocessor. In one mode of operation (for use with a low-power CMOS processor), the auxiliary chip sends an interrupt to the microprocessor when the power supply falls to a first level, and also resets the microprocessor when the supply voltage reaches a second preset level on the way up (i.e. while power is being restored). In a selectable second mode of operation (for use with NMOS processor), the auxiliary chip resets the processor when the power supply is on the way down.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.