| 摘要 |
PURPOSE:To enable to give flexibility to freezing condition by providing a history stack controlling mechanism and an interface signal line and controlling freeze of the history stack by a program. CONSTITUTION:An address conveyor circuit 4 compares addresses allotted to its own circuit and an address sent from a processor. When they coincide, the circuit 4 outputs 1, and logical circuits 5-1-5-3 instruct START, STOP, internal stack information, external stack information, STACK to a history controlling circuit 6. When it becomes impediment supervisory mode after putting desired freezing condition, a program for history freezing is executed by the processor. As freezing of a history stack can be controlled by the program, flexibility can be given to the condition of freezing. |
