| 摘要 |
An electronic control unit has a microcomputer and a signal monitoring circuit. When a brake pedal is pressed down and an analog signal from a brake pedal sensor is changed in a low power consumption operation mode of the microcomputer, the signal monitoring circuit operates cyclically, When the signal monitoring circuit starts the operation, a capacitor is charged with a constant current for only a charging time stored in a memory. When a comparator detects that the analog signal is lower than the charge voltage of the capacitor, a wakeup signal is output from the comparator to the microcomputer to cause the microcomputer to operate in the normal operation mode. The charging time is pre-stored in a memory of the microcomputer.
|
