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TMS320F280039C-Q1: CMPSS module problem consultation

Part Number: TMS320F280039C-Q1

Tool/software:

Hi, I see from the technical manual that when Voltage A>Voltage B, the output is 1.

But in my actual test, B's input was the internal DAC value (set to 3776), and A's input was the external sampling value.

The maximum value of A obtained by recording is 3759, but the output of CMPSS will be 1. Is this because of internal errors in the CMPSS module?