Patent ID: 6901338
Filing Date: 2005-05-31
Classification: G06F

Abstract:
1. A method used in a power control system for a personal digital assistant (PDA) with a microprocessor, the method comprising: (a) using the microprocessor to switch the PDA from OFF mode to SHUTDOWN mode, wherein when the PDA is in OFF mode, a central processing unit (CPU) and the microprocessor are both off, and when the PDA is in SHUTDOWN mode, the CPU is off while the microprocessor is on; (b) after step (a), using the microprocessor to switch the PDA from SHUTDOWN mode to ON mode, wherein when the PDA is in ON mode, the CPU and the microprocessor are both on; and (c) after step (b), using the microprocessor to switch the PDA between ON mode and STANDBY mode, wherein when the PDA is in STANDBY mode, the CPU idles and the microprocessor sleeps, and an operating current in the CPU during IDLE mode is smaller than the operating current during ON mode, and an operating current in the microprocessor during SLEEPING mode is smaller than the operating current during ON mode.