| 摘要 |
<p>PURPOSE:To reduce the mean power consumption greatly by stopping a main CPU which is large in power consumption in a key input wait state which is the majority of an operation mode and a key input process and a display process. CONSTITUTION:In a state wherein a fast process is not required, e.g. in a normal key input wait communication, the main CPU 11 is stopped and control is performed by a low power consumption type sub-CPU 12. When an application program requires the fast process such as the retrieval and correction of a data file, the sub-CPU 12 actuates the high-speed main CPU 11 to perform the process. The main CPU 11 in the case of performing fixed processes such as retrieval and correction or using instructions which are used frequently actuates a dedicated LSI 22 which performs those processes fast, delivers commands, and stops until the end of the processes. After the processes, the main CPU 11 is actuated again to perform following processes and passes data to the sub-CPU 12, and the data are delivered to a display process or an external interface.</p> |
