| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problem: though a branch target address related to a branch instruction also has a form clearly shown in a program in the case of conventional technology, there is risk that contents of the program are grasped when a third party analyzes the program by execution of the branch instruction by an illegal act, so as not to protect security. SOLUTION: In this microprocessor system, when the program contents are the branch instruction, the branch instrution is stored as a branch instruction (non addressed branch instruction) not designating the branch target address, in the program 150 stored in a storage device 140. As alternated, the microprocessor system is provided with a branch target address storage part 101, and the branch target address is stored in the branch target address storage part 101. The microprocessor system has a branch target address control part 120 controlling the branch target address when the non addressed branch instruction not designating the branch target address is fetched on the program 150. COPYRIGHT: (C)2005,JPO&NCIPI
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