UCD3138ACCEVM149: cannot read any of the registers of DTC controls in UCD3138A

hello

I am using UCD3138ACCEVM to controll a LLC circuit which made by us.

To make the [LLCHBFirmware-1.2] to work, I emptyed the content of the  funtion [void standard_interrupt(void)].

Then I modified the code, acktually it can run simplely.

while I want to enable the DTC to work with UCD7138, there is a trouble. as shown in the following picture, I cannot read any of the registers of DTC controls, an error emerged.

would you please tell me about the possible reason?

thank you very much.

Xiaofeng Wu