A control unit (103) writes the same data to mutually identical addresses of a nonvolatile memory (104) and a nonvolatile memory (105). The control unit (103) terminates the processing for writing to whichever nonvolatile memory, of the nonvolatile memory (104) and the nonvolatile memory (105), was the first to complete the processing whereby this nonvolatile memory was initially written to by some source other than nonvolatile memory, at the time-point where such processing is completed.

Information processing device

PROBLEM TO BE SOLVED: To simplify a confirmation processing of writing in a microcontroller that performs writing of the same data into a plurality of non-volatile memories using serial communication.SOLUTION: Each of chip select output terminals CS1-CS3 of a microcontroller 1 is connected to one of a plurality of non-volatile memories 2a-2c, and one of input terminals 3b, 3d and 3f of an arbitration circuit 3. Each of data output terminals OUTs of the non-volatile memories 2a-2c is connected to one of input terminals 3a, 3c and 3e of the arbitration circuit 3. An output terminal 3g of the arbitration circuit 3 is connected to an input terminal M-IN for serial data of the microcontroller 1. The arbitration circuit 3 is also configured to have an ON signal output from the output terminal 3g only if all signals input to the input terminals 3a, 3c and 3e are ON when all signals input to input terminals 3b, 3d and 3f are ON.

Electronic device and microcontroller

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Electronic device and microcontroller