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TM4C123AH6PM: What happen when phA and phB of EQI change simultaneously

Part Number: TM4C123AH6PM

Hi Experts,

Due to the noise environment, there is a chance that phA and phB of QEI module input signals rise or fall simultaneously. In this case, what happens on QEI counter? Is it incremented or decremented? 

I was looking for any logic table for phA/phB and timing figure but could not find it on the datasheet.

Regards,

Uchikoshi