Ink jet recording apparatus provided with interrupt control circuit and method for controlling recording apparatus

An ink jet recording apparatus provided with a CPU having plural modes including a mode to reduce the power consumption by suspending the clock signal as an operational mode, and executing the NMI interrupt process with the input of signal from power switching means as NMI interrupt signal, comprising:

• abnormality detection means for detecting abnormality;
• user logic circuit means for outputting trigger signal;
• a mask signal generating portion for receiving said trigger signal to generate NMI interrupt mask signal;
• a gate circuit for making said signal from power switching means invalid by said mask signal;
• and
• control means for setting the prohibition of said NMI interrupt for said user logic circuit means in accordance with abnormal signal from said abnormality detecting means, and outputting said trigger signal in accordance with said setting to enable said mask signal to be output from said mask signal generating portion to said gate circuit in accordance with said output trigger signal for making signal from said power switching means invalid.

An ink jet recording apparatus provided with a CPU having plural modes including a mode to reduce the power consumption by suspending the clock signal as an operational mode, and input means for inputting signal from power supply switching means as NMI interrupt signal for executing the NMI interrupt process, comprising:

• user logic circuit means for outputting signal;
• a mask signal generating portion for receiving said trigger signal to generate NMI interrupt mask signal;
• a gate circuit for making said signal from power switching means invalid by said mask signal;
• and
• control means for setting the prohibition of said NMI interrupt for said user logic circuit means when the said NMI interrupt signal is inputted by said input means for a designated number subsequent to said NMI interrupt process executed by the input of said signal from said power switching means, and enabling said user logic circuit means to output said trigger signal in accordance with said setting, and said mask signal generating portion to generate said mask signal in accordance with the output of said trigger signal for making signal from said power switching means invalid.

A method for controlling an ink jet recording apparatus provided with a CPU having plural modes including a mode to reduce the power consumption by suspending the clock signal as an operational mode, and executing NMI interrupt process with the input of signal from power switching means as NMI interrupt signal, comprising the following steps of:

• retaining a power supply status flag on non-volatile memory means;
• outputting trigger signal from user logic circuit means;
• and
• generating mask signal in the NMI interrupt signal generating portion for the NMI interrupt when said trigger signal is received, wherein
• the operational process of the ink jet recording apparatus is executed in accordance with said flag retained in said flag retaining step when said NMI interrupt process is executed by signal from said power switching means, and said flag retained in said flag retaining process is updated in said trigger signal outputting step for outputting trigger signal in accordance with the setting for said user logic circuit, and mask signal is generated in said mask signal generating step in accordance with said trigger signal for making signal from said power switching means invalid by the generation of said mask signal until said operational process is completed.

A method for controlling an ink jet recording apparatus provided with a CPU having plural modes including a mode to reduce the power consumption by suspending the clock signal as an operational mode, and executing NMI interrupt process with the input of signal from power switching means as NMI interrupt signal, comprising the following steps of:

• detecting abnormality by abnormality detection means;
• retaining a power supply status flag on non-volatile memory means;
• outputting trigger signal from user logic circuit means;
• and
• generating mask signal in the NMI interrupt signal generating portion for the NMI interrupt when said trigger signal is received, wherein
• abnormality is detected in said abnormality detecting step to output said trigger signal in said trigger signal outputting step in accordance with said abnormality, and said mask signal is generated in said mask signal generating step in accordance with said output trigger signal for making signal from said power switching means invalid by said generated mask signal.

A method for controlling an ink jet recording apparatus provided with a CPU having plural modes including a mode to reduce the power consumption by suspending the clock signal as an operational mode, and input means for inputting signal from power switching means as NMI interrupt signal, comprising the following steps of:

• deciding whether or not said NMI interrupt signal is inputted into said input means for a designated number;
• outputting trigger signal from user logic circuit means;
• and
• generating mask signal in the NMI interrupt signal generating portion for the NMI interrupt by receiving said trigger signal, wherein
• the NMI interrupt prohibition is set for said user logic circuit means when the input of said NMI interrupt signal is made in the designated number in said determining step subsequent to said NMI interrupt process executed by the input of signal from said power switching means, the trigger signal is output in said trigger signal generating step in accordance with said setting to user logic circuit means for generating mask signal in said mask signal generating step in accordance with the output of said trigger signal.