Patent ID: 6542726
Filing Date: 2003-04-01
Classification: H04B

Abstract:
A personal data assistant terminal which has data transmission and reception functions by a radio wave and a plurality of different power supply modes, comprising:a radio; a CPU for effecting power supply control of said personal data assistant terminal, the CPU having an operating condition defined by a plurality of power supply modes in which a system clock signal has a different frequency in each of the plurality of modes of said CPU, in addition to an off mode; and a power supply control for controlling the operating condition, by way of the power supply modes, of said CPU, the power supply control receiving status information from peripheral circuits and controlling the operative condition of said CPU based on a status of a peripheral circuit of said personal data assistant terminal; said power supply control having a terminal for transmitting, as an input signal to said CPU, a power supply mode change-over signal representative of one of said plurality of power supply modes which is to be entered subsequently by said CPU, and another terminal for transmitting, as an input signal to said CPU, a power supply mode defining signal for defining said power supply mode represented by the power supply change-over signal.