Data processing apparatus based on microprogram control.

摘要

A data processing apparatus includes a microinstruction memory (5) which stores microinstructions, and a microinstruction execution unit (7) which executes a selected one of the microinstructions by a pipeline process and which outputs an operation result. The microinstructions include a specific microinstruction (Mb1, Mb2). The data processing apparatus also includes a correction part (7; 105, 107; 205, 207) which has the microinstruction execution unit execute the specific microinstruction when a predetermined event occurs so that the parameter is changed to a corrected parameter which corresponds to a parameter used in an immediately previous pipeline process. The microinstruction execution unit stops operating when the predetermined event occurs and starts the operation again by using the corrected parameter.