Watch-Dog Mechanism Having Shift Register
Original Publication Date: 1988-May-01
Included in the Prior Art Database: 2005-Feb-15
This article describes an improved "watch-dog" mechanism which allows distinguishing between a reset state of a machine occurring after a general power on and a reset state arising from permanent error conditions. This mechanism is based on a conventional watch-dog device associated with three latches for memorizing watch-dog resets. The management of these allows the system to take specific and appropriate actions, such as the display of messages and the lighting of a light- emitting diode. Usual watch-dog mechanisms are widely used in high technology products having sophisticated means for detecting error conditions.