DEBUGGING DEVICE

PURPOSE:To set plural break point addresses by writing in advance a logic 1 in a break point address position of a break point memory circuit, and executing a break point when the logic 1 is read out. CONSTITUTION:In an executing state of a program, an address signal is outputted from a memory address generating circuit 4, and an access is executed to a memory circuit 5. The same address signal is impressed to a break point memory circuit 5a, too, therefore, if an output of the memory circuit 5a corresponding to an address which executes an access to the memory circuit 5 is ''1'', this signal passes through an AND gate 12, and sets a break point FF9. If an output of this FF9 is a logic ''1'', the timing stops in a timing generating circuit 3, and as a result, execution of the program stops. Since the memory circuit is used for a storage of a break point, the number of break points can be set unlimitedly.