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MSPM0G3507: Pin Attributes in the datasheet

Part Number: MSPM0G3507

Tool/software:

Hi !

I just check the datasheet of MSPM0G3507.

In the table 6-1, there is some pin functions like 

UART0_TX [2] / I2C0_SDA [3] / TIMA0_C0 [4]

What does the number in the [] mean?

For example, UART0_TX[2], what does [2] mean?

THanks

Ryder