TMS320F280049: what 's the current consume when only read from Flash?

Zane,

The current during flash read is inclusive of the operational current listed above the section you mention in the DS.  https://www.ti.com/document-viewer/TMS320F280049/datasheet#GUID-93E133FF-83DE-4472-82E4-3901DF618D99/TITLE-SPRS945A_1467990986_SWITCHINGCHAR_SF1 

The current values for programming the flash are a bit higher than just reading from flash so as long as you budget for this programming currents you should be fine.

Best,

Matthew