| 摘要 |
PURPOSE:To raise the degree of freedom of an interruption by making a CPU read an operation code of a software interruption, when an address bus coincides with a latch output of a break point, in case the CPU reads a data from a memory. CONSTITUTION:When a coincidence signal of a comparator 5 for always comparing a break point address and an address bus is active, an AND circuit 6 becomes active. Also, a data bus buffer 1 and a buffer 2 become disable and enable, respectively, an operation code 3 of a software interruption set in advance appears on a data bus, a CPU reads this data, and it is stored in an operation code fetch buffer in the CPU. Thereafter, when the operation code of a software interruption of this break point is executed, an interruption is generated. |
