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TMS320F28021: TMS320F28021 IEC60730 PSA function issue

Part Number: TMS320F28021


Dear

I can nomal write 0x846 to active PSA function when address from 0x840 to 0x880 value is 0x0000,but when address from 0x840 to 0x880 value is not 0x0000 and I

cann't activer PSA function from write 0x846 address.my program will enter below sub function when I write 0x846 address to active PSA function.

Pls help provide suggest,thanks