For an ink jet recording apparatus that utilizes the STOP mode function of a
CPU to reduce power consumption and a method for controlling the recording apparatus,
many NMI interrupts occur due to chattering generated upon switching when the trigger
for the restoration from the STOP mode is effectuated by use of the power switch,
and the normal ON/OFF process for the power supply is disabled. For example, therefore,
an ink jet recording apparatus, which is 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 receives a signal from a power switching unit as an
NMI interrupt signal for the execution of NMI interrupt process, is arranged to
be provided with a controller for prohibiting the NMI interrupt until operation
is completed by way of the status of the recording apparatus with respect to the
NMI interrupt process to be executed by the input of the signal from the power
switching unit.
