Emulator circuit and method for generating CMOS level clock input
US5200648A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1991 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Aug 13, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for generating a CMOS level clock signal from RC components for use in a microcontroller. The emulator includes an emulation chip and an emulation circuit. The emulation chip includes means for supporting RC clock input to accurately produce a sawtooth wave signal at the point of its connection with the RC network. The emulation circuit includes a comparator which transforms a sawtooth waveform produced by the emulation chip into a square waveform which is then inverted for use as a clock signal for a CMOS level microcontroller. The method includes the steps of emulating a clock signal input of an RC network, comparing the emulated RC signal to a reference signal to generate inverted square wave form output, and inverting the square wave form output for transformation into a CMOS level clock input suitable for use as a clock input for microcontrollers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.