| 摘要 |
A wireless communication handset having PDA functionality is configured to enter a PDA mode and a system acquisition mode. A handset processor sets a first timer (204) and monitors the keypad for input (206). Upon expiration of the timer (208), the processor and receiver module are powered to enter the system acquisition mode (210) and search for a system frequency. Upon detection of keypad input (206), the processor is powered to enter the PDA mode and permit use of the PDA functionality. When in PDA mode, the processor sets a second timer and returns the handset to a low-power sleep mode (202) if keypad input is not received before expiration of the second timer (220). If the received keypad input is the call 'send' key, the keypad input is ignored unless the call is an emergency call (222). The handset is otherwise maintained in the low-power sleep mode. |
