| 摘要 |
<p>PURPOSE:To reduce the power consumption and to secure compatibility by switching the operation clock of a CPU in the state wherein the operation of the CPU is guaranteed. CONSTITUTION:The operation clock CLK is switched while the CPU 11 is reset and after the operation is switched, the CPU 11 is released from being reset. Consequently, the operation of the CPU 11 is not affected by the discontinuity of the phase of the clock at the time of the clock switching. For the purpose, the operation clock CLK is switched from a high-speed clock CLK1 to a low-speed clock CLK2 to reduce the current consumption of the CPU 11 while the operation of the CPU 11 is guaranteed. Further, the operation clock CLK of the CPU 11 can be switched matching the operation speed of application software or a hardware option to be used.</p> |
