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Compiler: C28x MOVW assembly language instruction

Tool/software: TI C/C++ Compiler

In spru430, "MOVW DP, #16bit" means "Load the data page register with a 16-bit constant, DP(15:0) = 16bit;".

If the following codes are in my software, does "#_Buff " stand for immediate constant value? Generally, What are the following codes mean?

uint32_t Buff;

asm(" MOVW    DP, #_Buff ");