Electronic devices including indicator control circuits and related methods of controlling indicators
US6445935B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1998 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Oct 5, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/724
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An electronic device includes an indicator that generates an indication of an event responsive to an indicator control signal from an indicator control circuit coupled between a processor and the indicator. The processor generates an indicator off-time value and an indicator on-time value when an indication is desired, and the indicator control circuit receives the indicator off-time value and the indictor on-time value from the processor. More particularly, the indicator control circuit includes an off-time register, an on-time register, and an indicator control circuit. The off-time register stores the off-time value generated by the processor, and the on-time register stores the on-time value generated by the processor. The indicator control signal generator alternatingly enables the indicator control signal for a period of time determined by the on-time value stored in the on-time register and disables the indicator control signal for a period of time determined by the off-time value stored in the off-time register. The electronic device can also include an indicator pulse-duty register and a pulse width modulation circuit. The indicator pulse-duty register can be coupled to th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.