Portable telephone apparatus

Details Portable telephone apparatus Portable telephone apparatus

2006-08-01

2006-08-01

Eng, George (Department: 2643)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S127100, C455S127500, C455S343200, C455S343500, C455S574000

Reexamination Certificate

active

07085594

ABSTRACT:
The invention provides a portable telephone apparatus wherein, when a necessary voltage is not obtained from a cell because the cell is removed or consumed, data can be backed up with a simple configuration and at a low cost. A cell is removably accommodated in a cell accommodation portion of the body of a portable telephone apparatus, and the cell accommodation portion is closed up with a cell cover. Opening or closing of the cell cover is detected by a switch serving as a cell cover opening/closing detection apparatus in the body, and is outputted as an interrupt signal to a CPU through a control circuit. When the remaining power of the cell becomes little, a cell remaining power detection signal is outputted as another interrupt signal to the CPU through the control circuit. In response to either interrupt signal, stored data of a RAM are transferred to and protected by a flash ROM.

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