| 摘要 |
PURPOSE:To attain size reduction and precision improvement by charging a capacitor through a transisitor (TR) which turns on and off at a specific period and discharging the capacitor with a clear signal, and generating a reset signal when the capacitor charge attains to a specific amount. CONSTITUTION:A clock signal phi and the clear signal CL generated by a specific instruction of a microcomputer are inputted to N channel enhancement MOS TRs 1 and 2 at the specific period, and the capacitor is charged when the signal phi is on and discharged with the signal CL; when its accumulated charge attains to the specific amount, the system reset signal RS is generated by an inverter 1 having large input impedance. Consequently, the number of elements is decreased to simplify the circuit constitution. |
