| 摘要 |
PROBLEM TO BE SOLVED: To protect data on a memory card against the voltage changes of a car battery and to secure continuous use of the memory card by preparing a mobile terminal unit containing the memory card, a battery as a power supply of the mobile terminal unit and a power interrupt detecting circuit. SOLUTION: A mobile terminal unit 1 containing a memory card is prepared together with a car battery 5, which serves as a power supply of the unit 1 and a power interrupt detecting circuit 4. In other words, the circuit 4 functions to prevent a defective storage processing of the memory card caused by voltage changes of the battery 5 during data processing. The circuit 4 is placed between the battery 5 and a card slot 2, where a main substrate 3 and the memory card of the unit 1 can be freely loaded and unloaded. In such a constitution of the unit 1, a CPU receives a signal of the circuit 4 and controls the secondary power supply, according to the situation. |
