| 摘要 |
PURPOSE:To execute the debug of only a targeted program without being conscious of an OS, etc., by preventing emulation from being interrupted under the execution of the OS, etc., set in a specific address range. CONSTITUTION:When all of the instruction fetch addresses (A12-15) inputted to a NAND gate 9 are set at H levels, that is, the address is within the ranges (F000-FFFF), the output of the NAND gate 9 goes to an L level, and at this time, INT input 5, NMI input 6, and SVI input 7 are masked by an AND gate 8, and they are prevented from being inputted to an interruption control circuit 4. In other words, all of the interruption from the outside of a microprocessor are masked and not accepted under the execution of the range of the addresses (F000-FFFF) by the microprocessor. Therefore, it is possible to prevent the emulation from being interrupted under the execution of the OS, etc., set in the specific address range. In such a way, the debug of only the targeted program can be performed without being conscious of the OS, etc. |
