| 摘要 |
PROBLEM TO BE SOLVED: To prevent the fraudulence worked out by the reloading of the program onto the non-volatile memory and also curtail the number of pins of the non-volatile memory. SOLUTION: In the non-volatile memory mounted on the control board 100, the built-in control circuit 102 permits the loading by transmitting the loading permission signal to the request sender when a given time passes after the reception of the loading request signal from the CPU (after the passage of delay time with delay circuit 103). As a result, the time required for the fraudulence to be worked out by the reloading of the program is set longer thereby hindering the accomplishment of the fraudulence substantially. The loading permission signal is set with the control circuit while a register circuit referable from outside is added to curtail the number of input/out pins. COPYRIGHT: (C)2006,JPO&NCIPI
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