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RM48L940: ESMSR3 Register Read

Part Number: RM48L940

When I attempt to read ESM Grp 3 status register (address 0xFFFFF520) I get garbage content from RAM (stack location). I'm able to read Grp 1 and Grp 2 status registers as well as other registers from the ESM module without a problem. Is there anything special I need to do before I can read Grp 3 register?