| 摘要 |
PURPOSE:To easily change a set interruption level and to perform a setting test by providing a level setting device to an interface together with an interruption register, a pseudo interruption request generator and a comparator. CONSTITUTION:An interruption level of priority '1', for example, is first set to a levelsetting device 22 of an interface 2. A CPU 1 sets an interruption level of priority '3' to an interruption register 23 and delivers an interruption request signal of said level through a pseudo interruption request signal generator 25. A comparator 24 delivers no coincidence signal no coincidence is obtained between the level of said interruption request and the interruption level of the device 22. Thus the CPU 1 sets an interruption level of priority '2' to the register 23. In such as way, the CPU 1 sets successively the interruption levels 3, 2 and 1 to the register 23. While the comparator 24 performs successively comparisons and delivers a coincidence signal to the CPU 1 when the coincidence of comparison is obtained. The CPU 1 carries out an interruption routine based on the coincidence signal and in response to the interruption level of priority '1'. |
