Method for providing an extensible register in the first and second data processing systems
US5680632A · kind A · utility
12Cited by
13References
39Claims
0Family size
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Key dates
| Filing date | Dec 24, 1992 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Dec 24, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/30112
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system providing an extensible register and method thereof. A new CPU has an extensible index register. The new CPU is object code compatible with the old CPU having an 8-bit index register, yet the index register of the new CPU can be effectively extended to 16 bits when new instructions are used. As a consequence, the user is able to make the choice between using assembly code software written for the old CPU and having the functionality of an 8-bit index register, or writing new assembly code software for the new CPU and having the functionality of a 16-bit index register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.