| 摘要 |
PROBLEM TO BE SOLVED: To obtain a power source feed circuit which effectively utilizes a capacity of a voltage source. SOLUTION: A voltage detection circuit 3 supplies a battery consumption- warning signal (a) to a microcomputer 5 when a voltage of a battery cell 1 falls to be a predetermined voltage range. The microcomputer 5 prohibits a flash memory 7 from writing and erasing data. When a capacity of the battery cell 1 further decreases, the voltage detection circuit 3 supplies an operation stop signal (b) to the microcomputer 5. The microcomputer 5 prohibits the flash memory 7 also from reading data. |
