Patent ID: 6926380

Claim:
An ink jet recording apparatus for executing recording with use of a recording head, said apparatus provided with a CPU having plural modes including a mode to reduce power consumption by suspending a clock signal as an operational mode, and receiving a signal from power switching means as an NMI interrupt signal for the execution of an NMI interrupt process, said apparatus comprising: non-volatile memory means for retaining a power supply status flag; user logic circuit means for outputting a trigger signal based on a signal from the CPU; a mask signal generating portion for receiving the trigger signal to generate an NMI interrupt mask signal; and a gate circuit for making the signal from the power switching means invalid by the mask signal; wherein in the NMI interrupt process, said user logic circuit and said mask signal generating portion are set to prohibit the NMI interrupt, and then a capping operation of the recording head is executed if discriminated that a power supply status flag is ON, and said user logic circuit and said mask signal generating portion are set to cancel prohibition of the NMI interrupt after the capping operation is completed, and then setting is made to shift to a mode for reducing the power consumption.