Patent ID: 7447959
Filing Date: 2008-11-04
Classification: G01R,G06F,G11C

Abstract:
1. A processing circuit comprising: a central processing unit; a nonvolatile memory unit; a pulse generating unit; and a terminal, wherein said terminal is capable of receiving a first pulse signal, which has a first frequency, from outside of the processing circuit, wherein said central processing unit is capable of performing a first operation for checking frequency of a generating pulse signal generated by said pulse generating unit, wherein said nonvolatile memory unit has a plurality of nonvolatile memory cells and receives said generating pulse signal for storing data to ones of said nonvolatile memory cells, and wherein in performing said first operation by said central processing unit, said central processing unit executes operations for comparing said first frequency of said first pulse signal with said frequency of said generating pulse signal and for adjusting said frequency of said generating pulse signal in accordance with a result of the comparing.