Microprogrammed programmable controller

Details Microprogrammed programmable controller Microprogrammed programmable controller

G - Physics

06

F

354/230.71

G06F 9/22 (2006.01) G05B 19/05 (2006.01) G06F 9/48 (2006.01) G06F 12/06 (2006.01)

Patent

CA 1139002

Abstract of the Disclosure A programmable controller includes a processor formed around a pair of four-bit bipolar microprocessors. A con- trol program formed by selected macroinstructions is stored in a random access memory and it is executed by sequentially mapping each macroinstruction operation codes into a corres- ponding 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 more effectively with the use of a decimal adjust accumulator.

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