Microprogrammed programmable controller
US4266281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Apr 2, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/15103
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A programmable controller includes a processor formed around a pair of four-bit bipolar microprocessors. A control program formed by selected macroinstructions is stored in a random access memory and it is executed by sequentially mapping each macroinstruction operation code into a corresponding microroutine which is stored in a read-only memory. Some macroinstructions include operand addresses of a line in an I/O image and data table portion of the random access memory, and one macroinstruction (ADX) expands this operand address to enable the I/O image and data table to be expanded in size. A timer macroinstruction is executed in part by reading the state of a counter which is driven by a real time clock, and arithmetic functions are performed with the use of a decimal adjust accumulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.