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2812 SCI电平问题

Other Parts Discussed in Thread: MAX232

我想用2812SCI与Gps和数传电台通信   但是GPS和数传电台都是串口5VTTL的电平,方法实现DSP与GPS数传电台的电平兼容呢?

还有2812的所有接口不管是再GPIO状态还是用作特殊功能都是输入时3.3VTTL输出3.3VCMOS吗?谢谢!!

还有28335的上述情况是和2812一样的吗?