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TMS320F28377D: I wonder what '_DUAL_HEADERS' means in AdcSetMode( ) function.

Part Number: TMS320F28377D

Hi,

The attached image is part of the AdcSetMode () function in the F2837xD_Adc.c file.

I wonder what '_DUAL_HEADERS' means.
In what cases do I need to define the keyword?

Thanks in advance.