| 摘要 |
PROBLEM TO BE SOLVED: To prevent any invalid data from being transferred from an external memory to the on-board memory of a remote controller when there is possibility that the invalid data are transferred since any program or data are transferred from the external memory to the on-board memory without judging the validity of the program at the origin of transfer or the data at the origin of transfer in a micro system to be used for the remote controller connected to the master station of a city disaster prevention radio system. SOLUTION: An external memory is provided with a program flag indicating whether or not a program is valid and a data flag indicating whether or not data are valid. A boot program judges the validity of the program at the origin of transfer and the data at the origin of transfer according to the program flag and the data flag. Thus, it is possible to transfer only the valid data to the on-board memory.
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