| 摘要 |
PURPOSE:To provide an electronic apparatus which surely alarms an operator at a low voltage and prevents interruption of the system operation. CONSTITUTION:If it is detected by a voltage detection circuit 21 of a power supply circuit part 2 that the output voltage of a battery P1 is lower than a reference voltage level, a transistor TR Tr1 is turned off to stop the supply of a charging current from the battery P1 to a secondary battery P2. A TR T12 in a switching part 4 is turned off by a CPU 3, and a TR Tr3 us turned on. Power is supplied to the CPU 3, a pager function part 6, and a low voltage reporting part 5 from the secondary battery P2 instead of the battery P1. |
