Supervisory circuit for a programmed processing unit

Details Supervisory circuit for a programmed processing unit Supervisory circuit for a programmed processing unit

G - Physics

06

F

354/221, 354/225

G06F 11/28 (2006.01) G06F 3/05 (2006.01) G06F 11/00 (2006.01) G06F 11/14 (2006.01)

Patent

CA 1252899

34 52,555 ABSTRACT OF THE DISCLOSURE A supervisory circuit for use in an integrated circuit to supervise the program execution of a processing unit is disclosed. The processing unit gener- ates a restart signal at a particular duty cycle under proper program execution conditions and at an undesirable duty cycle under improper program execution conditions. The supervising circuit includes a capacitive or like circuit element for converting the restart signal into a signal representative of the duty cycle thereof and com- pares the generated signal to a reference window comprising upper and lower reference values. Should the generated signal exceed the boundaries of the window reference, a corresponding control signal is generated to change the circuit conditions and generate a reset signal to the processing unit to govern the program execution thereof to a prespecified point from which point program execution may continue upon removal of the reset signal.

506765

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