| 摘要 |
<p>PURPOSE:To prevent in advance a device with poor storage function from being used by containing a battery consumption degree deciding circuit of a battery voltage measuring circuit, etc., and a display circuit in a function adding device, and displaying information related to a consumption state of a battery to the display circuit on a device of the function adding device. CONSTITUTION:The device is provided with a consumption degree deciding circuit 9 for deciding and displaying the degree of consumption of a backup battery 6, and a display circuit 10, a voltage of a power source supply line A 7 is inputted as a decision input 11 to the consumption degree deciding circuit 9, and a result of decision is inputted as a decision output 12 to the display circuit 10. That is the battery consumption degree deciding circuit 9 is, for instance a voltage measuring circuit for measuring an output voltage value of the backup battery, monitors the output voltage value which drops by consumption of battery energy, detects a fact that it drops to below a voltage value determined in advance and generates a detecting signal. In such a way, a user can know consumption of the battery by this display, annihilation of information is prevented, and also, use of the function adding device whose storage holding capacity is lost is avoided.</p> |
