Data processing device

Abstract

A data processing device according to embodiments comprises a non-volatile memory, and executing a process to data stored in the memory while switching a power to be supplied to the memory from a first power for executing the process to a second power being lower than the first power. When a time required for the process is shorter than a threshold, the device executes the process with the power supplied to the memory being the first power, and after the process is finished, the device switches the power supplied to the memory from the first power to the second power. When the time required for the process is equal or longer than the threshold, the device switches the power supplied to the memory from the first power to the second poser, returns the power supplied to the memory from the second power to the first power, and executes the process with the power supplied to the memory being the first power.

What is claimed is: 
     
         1 . A data processing device comprising a memory being a non-volatile memory, and executing a process to data stored in the memory while switching a power to be supplied to the memory from a first power for executing the process to a second power being lower than the first power, wherein
 when a time required for the process is shorter than a first threshold, the device executes the process with the power supplied to the memory being the first power, and after the process is finished, the device switches the power supplied to the memory from the first power to the second power, and   when the time required for the process is equal to or longer than the first threshold, the device switches the power supplied to the memory from the first power to the second poser, returns the power supplied to the memory from the second power to the first power, and executes the process with the power supplied to the memory being the first power.   
     
     
         2 . The device according to  claim 1 , wherein
 the device includes a plurality of candidates of the process,   when the time required for the process is equal to or longer than the first threshold and the number of the candidates of the process is smaller than a second threshold, the device executes the process with the power supplied to the memory being the first power, and after the process is finished, the device switches the power supplied to the memory from the first power to the second power, and   when the time required for the process is equal to or longer than the first threshold and the number of the candidates of the process is equal to or greater than the second threshold, the device switches the power supplied to the memory from the first power to the second poser, returns the power supplied to the memory from the second power to the first power, and executes the process with the power supplied to the memory being the first power.   
     
     
         3 . A data processing device comprising a memory being a non-volatile memory, and executing a process to data stored in the memory while switching a power to be supplied to the memory from a first power for executing the process to a second power being lower than the first power, wherein
 the data processing device includes a plurality of candidates of the first process,   when the number of the candidates of the first process is smaller than a specific threshold, the device executes the process with the power supplied to the memory being as the first power, and after the process is finished, the device switches the power supplied to the memory from the first power to the second power, and   when the number of the candidates of the process is equal to or greater than the specific threshold, the device switches the power supplied to the memory from the first power to the second power, returns the power supplied to the memory from the second power to the first power, and executes the process with the power supplied to the memory being the first power.