TMS320F280049C: How to split 32-bit data into two 16 bit data

I'm not certain I understand what this code intends to do.  I think you want to output the upper 16 bits of CLLLC_vPrimRef_Volts in the same raw form in which it resides in memory.  To do that requires you use a technique called type punning.  To learn more about it, especially the many problems associated with it, please perform an internet search on the term type punning in C.  

In this specific case, I recommend you remove the variables data and data_Half.  Then change line 1947 to ...

 EE24CX_Write_Byte(CLLLC_VPrim_address_H, (int16_t)(*((int32_t *)&CLLLC_vPrimRef_Volts) >> 16));

By restricting the use of type punning to one expression that is an argument to a function call, you are unlikely to have any problems.  But please understand that extending the use out beyond this point can quickly lead to things going wrong.

Please let me know if this suggestion resolves the problem.

Thanks and regards,

-George