Data processor for multiple macro-service processings based on a single

Abstract

A data processor includes a central processing unit having an execution unit, a program counter for supplying the address of the instruction to be executed and a program status word for holding the execution status of the program, an interrupt request generating means for generating the processing request in asynchronisum with the central processing unit, and interrupt controller receiving the processing request from the interrupt requested generating means and a data memory for storing the processing data. The interrupt request generating means is capable of generating a macro-service request for starting the macro-service processing while saving the contents of the program counter and the program status word. The data memory the control information for starting the macro-service processing and the command information for executing a plurality of macro-service processing. The control information includes a base address for the command information corresponding to the macro-service processing. The interrupt controller response to the macro-service processing request from the interrupt request generating means and outputs a single macro-service request signal to the central processing unit and directly accesses the data memory permitting the central processing unit to operate continuously.