Patent ID: 7293188

Claim:
An integrated circuit comprising: a power supply pin for receiving power from a power source; a first voltage detection circuit having an output to provide a first voltage detection signal indicative of a first voltage level of the power supply pin; a second voltage detection circuit having an output to provide a second voltage detection signal indicative of a second voltage level of the power supply pin, the second voltage level different from the first voltage level; a central processing unit, the central processing unit configured to be powered from power received via the power supply pin; an interrupt handler operably coupled to the central processing unit, the interrupt handler responsive to a set of at least one interrupt; an interrupt handler control circuit controlling the responsiveness of the interrupt handler to the set of at least one interrupt, the interrupt handler control circuit is responsive to the first voltage detection signal and responsive to a first signal having a first signal state which is at least indicative that the voltage level of the power supply pin had dropped below the second voltage level as indicated by the second voltage detection signal, wherein when the first signal is at the first signal state, the interrupt handler control circuit enables the interrupt handler to be responsive to the set of at least one interrupt when the first voltage detection signal indicates that the voltage level of the power supply pin is above the first voltage level.