DEBUGGING DEVICE

PURPOSE:To effectively execute a debugging activity by setting the number of waiting cycles at the time of access an emulation memory according to the acting speed of a microprocessor for a target system. CONSTITUTION:When the acting speed of the microprocessor 11 of a target system 1 inputted by an operator is faster than a value corresponding to the acting speed of the emulation memory 22, a waiting controller 24 selects an output signal from a delay circuit 24a by a switching unit 24. When the microprocessor 21 reads out data stored in the emulation memory 22, the waiting controller 24 outputs a signal delayed by one waiting cycle to the microprocessor 21 and a bus controller 23. Therefore, the debugging activity can be effectively executed even if the action speed of the system 1 is faster than the action speed of the memory 22.