| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a semiconductor device enhancing concealment of a program to be executed. SOLUTION: When a CPU(Central Processing Unit) 37 executes a module PM-1 with concealment, while the CPU 37 accesses to an internal memory 32, a switch circuit 34 and a selective circuit 36 are made into non-connected states so as to intercept an access from the outside of a semiconductor chip 31 to a CPU data bus 40. On the other hand, while the CPU 37 is non-accessed to the internal memory 32, the switch circuit 34 and the selective circuit 36 are made into connected states so as to permit the access from the outside.</p> |
