| 摘要 |
<p>PURPOSE:To easilky recognize the conditions of program execution by surely letting the influence of the execution of a program appear at any arbitrary check point of the program as memory reference outside a chip and observing that operation from the outside of the chip. CONSTITUTION:When an instruction decoded by an instruction decoder 106 is an instruction for debugging, an index number idi (=i) designated by this instruction for debugging is dispatched from the instruction decoder 106 to an instruction operation control part 110 for debugging, and the reading of the instruction is indicated. Based on this idi and the contents of a base register (BR) 109, the memory address of the moving destimation of the instruction, which is replaced by the instruction for debugging, to be originally executed, namely, the leading address of an i-th entry in a table area 201 of a main memory 20 is calculated by the instruction operation control part 110 for debugging, and the instruction to be truely executed from that address is read through a system bus 30, dispatched to the instruction decoder 106 and decoded.</p> |
