| 摘要 |
In a microcomputer, a circuit is provided which performs the option setting of the condition of an I/O port. The option setting is repeatedly performed while the microcomputer is operating. As a result, even if the option setting is changed to an incorrect setting due to noise from external sources, the incorrect option setting is immediately returned to the correct setting. Moreover, the option setting is never reset at the time of resetting other than the resetting performed at the time of the turning on of the power.
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