| 摘要 |
<p>PURPOSE: To improve the function of a system by interrupting transmission and resetting a microcomputer mounted on a vehicle in the case that a transmission equipment of the vehicle performs transmission for a time longer than a prescribed transmission time because of malfunction. CONSTITUTION: A microcomputer 10 controls the transmission operation of a high frequency power amplifier 30 for one frame transmission time Tt of the equipment mounted on the vehicle or an emergency signal transmission time. If an error occurs at this time, a first timer 40 starts counting to output a signal in the high level for a time 2Tt. Then, a drive circuit 50 to which the output signal of an AND gate AN1 is inputted drives an amplifier 30 for the time 2Tt to perform the transmission. Consequently, malfunction occurs in a microcomputer 10, and the transmission is not performed over the time 2Tt. A second timer 60 to which the output of the timer 40 is inputted counts for the time Tt to output a signal. A reset signal generation part 70 to which the output signal of the timer 60 and that of the microcomputer 10 are inputted outputs a reset signal to the microcomputer 10, thus entering into the steady operation.</p> |
