| 摘要 |
PROBLEM TO BE SOLVED: To provide an integrated circuit device capable of keeping the safety of a system from the threat of illegal use by analyzing/falsifying a program or data. SOLUTION: A code processing part 310 for decoding the program or data from an external storage part 200 and encoding the data when writing the data into the external storage part 200, a monitoring part 320 for monitoring access from the outside to a system IC 300, an internal power source part 330 having a function for supplying power to a sub storage part 340 and monitoring part 320 and cutting the supply of power to a sub storage part 340 when there is a power supply cutting indication from the monitoring part 320, and the sub storage part 340 for holding an encoding/decoding key based on the supply of power from the internal power source part 330 are integrated in the system IC 300 and these components are made into one chip. |
