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I donÂ't anderstand how define a ports of ADuC831 for I2C communications. The names MOSI and MISO are not anderstandable for Keil programma who I use. Please help me with this problems.
I don't work with your processor, so I can't give explicit information.
But it is very common that processor pins have multiple names, because you may configure the pin for one of several functions.
In this case MOSI/MISO are names when the pins are used with SPI. SDATA/SCLOCK are probably the names when the pins are configured for use with I2C.
I think that you will find that the datasheet do specify pin names for these signals. But the processor may possibly have multiple pins that can be used, so the description of the I2C function may just use signal names, while the chapter describing how to set modes for all pins may mention these signal names - possibly on multiple pins - and tell how to configure these pins for I2C use instead of being generic GPIO pins.