Abstract: A method for analyzing the operation of a microprocessor connected to a system to be tested and a plurality of buses includes the following steps. From the information concerning bus signal states and instruction execution, only information for cases other than interrupt routine processes and subroutine processes is selected, and the selected information is stored into a memory device, and then an analysis of the operation of the microprocessor on the basis of the selected and stored information is carried out. Alternatively, from the information concerning bus signal states and instruction execution, only information for cases other than executions of a stack pointer changing instructions and interrupt response processes is selected, and the selected information is stored into a memory device, and then an analysis of operation of the microprocessor on the basis of the selected and stored information is carried out. Apparatuses for these methods are also disclosed.

Abstract: The apparatus for analyzing the operation of a microprocessor provides a switch for instructing the commencement of a data search and a switch for specifying an internal register of the microprocessor, and when a data search is commenced, searches for and displays the data when an instruction is executed by which the contents of the specified internal register is changed.