| 摘要 |
PURPOSE:To obtain an information processor with which the decoding of the program PG is difficult by the third person, by making the addressing order of the PG of the PG counter different from the reading order of the PG out of the memory device storing the PG. CONSTITUTION:When the information processor starts working, the multiplexer 21 is controlled by the control unit 19. And the operation of the CPU11 is discontinued by the switch signal 22. At the same time, the address signal is supplied from the unit 19 in the form of the address of the address converting memory device 18. And the unit 19 makes the device 18 store the irregular address converting rule. Then the signal 22 is switches so as to secure a selection for the address of the CPU11, and thus the stop mode of the CPU11 is cancelled. The CPU11 generates the address signal through the device 18 and then reads the instruction out of the PG memory device 12. The contents of the device 12 and the data memory device 13 are rearranged based on the converting rule stored in the device 18. And the address order of the PG counter in the CPU11 is different from the order of the PG read out of the device 12. Accordingly, the protection of the secret is secured for the PG. |
