| 摘要 |
The present invention proposes an output signal circuit capable of automatically detecting polarity, whose input/output signal terminal of the output signal circuit has both input and output functions. When a system undergoes a power on reset or a hardware reset, the output signal circuit can be shut off, and the input state of the input/output signal terminal is used to set the polarity of output signal. After reset, the pin is restored to its normal output. When an IC has the output signal capable of automatically detecting polarity, the flexibility in design of application circuits can be enhanced. Limitation of usage of IC due to fixed polarity of output signal can thus be avoided.
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