Semiconductor memory apparatus

Details Semiconductor memory apparatus Semiconductor memory apparatus

G - Physics

11

C

G11C 15/04 (2006.01) G06F 12/14 (2006.01)

Patent

CA 2137210

A semiconductor memory incorporates a protecting circuit which causes data stored in a memory portion to be outputted by executing a key canceling sequence from an external apparatus. The data stored in the memory are not outputted only when a key canceling signal is inputted to the protecting circuit to execute the key canceling sequence, so that the data are not outputted only by inputting an address signal and a reading signal to the memory apparatus. As a result, it is impossible to find out the contents of the program stored in the memory portion.

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