| 摘要 |
PURPOSE:To accept evenly many requests for interruption, by supplying the value of a counter which displays the number of the interruption signal to a microprocessor with the output of a selector which selects one of plural interruption signals. CONSTITUTION:The output of a selector which selects one of plural interruption signals is used to an interruption request to a microprocessor. The value of a counter which discontinues its operation with the output of the above-mentioned selector and displays the number of an interruption signal is supplied to the microprocessor. That is, a selector 100 selects one of interruption requests 110- 113 designated by a counter 101 and supplies it to a counter 101. Then the counter 101 counts up with the output 114 of the selector 100 and when no interruption request is given and then stops its counting when an interruption request is given. The output 114 is supplied to a microprocessor 120 as an interruption signal to turn on a reception signal 115. Then the value of the counter 101 is supplied to a data bus 40 of the processor 120 through a bus output circuit 102. |
