在微机上模拟I2C总线的设计中，用并行口的D0（PIN2）模拟SCL信号，用D1（PIN3）模拟SDA信号。根据IIC总线的电平规范
-Computer simulation on the design of I2C bus with a parallel port D0 (PIN2) Analog SCL signal, with D1 (PIN3) Analog signal SDA. According to the IIC bus specification level
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