| 摘要 |
<p>PURPOSE:To input data accurately, by provding a rejecting means which rejects selectively inputted data when data is inputted from an input means. CONSTITUTION:When one key on a keyboard KB is depressed, an interrupt is given to a CPU through a control bus CB. The CPU detects the code of the depressed key through an encoder provided in the keyboard KB and through a data bus DB. The interrupt given from the keyboard KB to the CPU can be masked by the CPU. However, even if the interrupt from the keyboard KB is masked by the CPU, the interrupt from the keyboard KB generated when the interrupt is masked does not disappear to operate normally the interrupt from the keyboard KB after masking of the interrupt from the keyboard KB is released.</p> |
