Portable remote terminal in which its clock frequency is switched

摘要

A portable terminal comprising a state monitoring portion for monitoring an operating state of a microprocessor in a main control portion, and for increasing a clock frequency when the microprocessor conducts software processing in the main control portion, and for decreasing a clock frequency to supply the minimum operating clock for the microprocessor enough to operate when the microprocessor does not conducts the software processing. The present invention can save the power of the portable terminal effectively.