| 摘要 |
<p>PURPOSE:To shorten the time extending from turn-on of a power source to initializing, by initializing simultaneously each CPU by an external signal, in an arithmetic unit having a main CPU and plural sub-CPUs. CONSTITUTION:A title microcomputer control device is provided with a main CPU1 for executing a control of the whole circuit of said device, and a sub-CPU 2 which is operated by a control signal from this main CPU1, and provided with an input switch 3 for starting an initializing program of the main CPU1 and the sub-CPU2. In this regard, while there is no interruption, a pull-down resistance 4 for stabilizing it to an 'L' levle is provided on an interruption terminal of the sub-CPU2. In this state, when the input switch 3 becomes on, an all clear terminal of the main CPU1 becomes an 'H' level, and the main CPU1 is initialized. Also, at the same time, the interruption terminal of the sub-CPU2 also becomes an 'H' leve, an interruption processing program is executed, and the initializing is ended.</p> |
