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芯片对于高低电平的判断

Other Parts Discussed in Thread: MSP430F5419A

【芯片型号】msp430F5419A

【问题描述】该芯片的I2C功能寄存UCBxSTAT 其中有一位UCBBUSY用判断I2C总线状态,如果I2C总线一直为低电平时则表明总线处于忙状态,如果一直为高电平时则为空闲,那请问电平要高于多少伏芯片才认为是高电平,低于多少伏芯片才认为是低电平,I2C总线上有3.3V的上拉电阻,

有劳各位解答!