A drive system for a surgical fastener is composed of a drive tool with a drive tip that mates closely with the recess formed in the head of a threaded fastener. The logic synthesis tool logically synthesizes an HDL-described circuit and then outputs intermediate data. When an ignition is made OFF, there is constituted a low current consumption mode for carrying out calculation by intermittent operation and power source to the MR sensor is made OFF by a sensor switch. Functionally, an apparatus according to an embodiment of the present invention includes 3 blocks: a scrambler, egress logic, and a de-scrambler.