| 摘要 |
<p>PURPOSE:To speed up the processing by providing a means to execute the setting control of the CPU processing speed of a clock control circuit in accordance with a special key input and a means to execute the setting control of the bus timing of a bus control circuit in accordance with other special key input, recognizing the key input with a CPU, and independently setting the environment for a bus and the CPU. CONSTITUTION:When a special key operation such as a special function key input form a keyboard is executed, a CPU 2 decides the instruction contents. When the instruction contents are the instruction concerning the processing speed of the CPU 2 itself, the CPU 2 sets and controls the clock timing of a clock control circuit 5, and when the special key input is the instruction concerning the processing speed of a bus 1, the CPU 2 sets and controls the bus timing of a bus timing control circuit 6 and the CPU2 controls the processing speed of the bus. In such a way, in accordance with the situation, the bus and CPU environment to use the feature is selected and the processing as a whole can be accelerated.</p> |
