Power-up reset conditioned on direction of voltage change

Details Power-up reset conditioned on direction of voltage change Power-up reset conditioned on direction of voltage change

1990-11-15

1993-04-13

Dixon, Joseph L.

Excavating

371 66, 364DIG2, 364934, 3649484, 3649485, 364707, 395575, 3072723, H01S 306

Patent

active

052030008

ABSTRACT:
A system which includes a microprocessor (or microcontroller) and an auxiliary chip which monitors the system power supply voltage and performs related functions for the microprocessor. In one mode of operation (for use with a low-power CMOS processor), the auxiliary chip sends an interrupt to the microprocessor when the power supply falls to a first level, and also resets the microprocessor when the supply voltage reaches a second preset level on the way up (i.e. while power is being restored). In a selectable second mode of operation (for use with NMOS processor), the auxiliary chip resets the processor when the power supply is on the way down.

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