Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1981-10-20
1984-08-07
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307592, 364900, H03K 1722, H03K 1728
Patent
active
044645848
ABSTRACT:
In a microprocessor with a reset circuit arrangement acting in dependence upon the inception of its supply voltage, safe operation is ensured after stoppages or operating voltage interruptions, particularly in view of a delay of the internal program flow up to the orderly start of a quartz-stabilized oscillator in the stationary operation. A reset signal derived from the supply voltage is conducted through a switching stage steadily to the reset input of the microprocessor, which is deactivatable in dependence upon the start of the oscillator contained in the microprocessor so that the reset input is no longer controlled during the steady-state operation. The switching stage, designed as an external microprocessor circuit, is preferably controlled through a voltage booster circuit as normally provided in clock microprocessors for controlling a digital display, and which is supplied through the divided oscillator frequency. It is used particularly in microprocessor-clock components to ensure the start of the processing of the internal program for time determination and time display only after a steady-state operating stage of the quartz stabilized oscillator has been achieved.
REFERENCES:
patent: 3599016 (1971-08-01), Leightner
patent: 4131855 (1978-12-01), Hamagawa
patent: 4232236 (1980-11-01), Yomogida et al.
patent: 4348743 (1982-09-01), Dozier
patent: 4367422 (1983-01-01), Leslie
Beek Achim
Hentzschel Hanspeter
Eurosil GmbH
Heyman John S.
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