| 摘要 |
A method for protecting a program in a microcomputer wherein analysis of the program by a third party is made difficult. It is configured that at least one region of the program enclosed by a memory 2 is enciphered, and the program is enclosed by a memory 2 together with a key necessary for the decode thereof, and the enciphered region is decoded using the key with a decode circuit 5 at the time when the enciphered region is accessed, and the decoded program data is outputted to a CPU 1.
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