Patent ID: 7103183

Claim:
A production method for an electronic apparatus comprising a board having a separable region, said board being mounted with a central processing unit, an electrically alterable nonvolatile storage device, a connector, a scrambling device, and a detection device for detecting whether said region is separated or not, wherein: when said region is not separated yet, data read out of said storage device can be descrambled with a first scrambling pattern by said scrambling device and the descrambled data can be transferred to said central processing unit, and by connecting an external apparatus to said connector and directly controlling an internal logic circuit of said central processing unit, said central processing unit can be caused to output data to said scrambling device and said scrambling device can scramble the output data of said central processing unit with said first scrambling pattern and write the scrambled data to said storage device; and when said region is separated, based on an output signal of said detection device, data read out of said storage device can be descrambled with said first scrambling pattern by said scrambling device and the descrambled data can be transferred to said central processing unit, and by connecting said external apparatus to said connector and directly controlling the internal logic circuit of said central processing unit, said central processing unit can be caused to output data to said scrambling device and said scrambling device can scramble the output data of said central processing unit with a second scrambling pattern and write the scrambled data to said storage device, said production method comprising: a writing step in which by connecting said external apparatus to said connector and directly controlling the internal logic circuit of said central processing unit, said central processing unit is caused to output data to said scrambling device, and in which said scrambling device scrambles the output data of said central processing unit with the first scrambling pattern and writes the scrambled data to said storage device; and a separating step of separating said region after said writing step.