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DS90UB936-Q1: Crystal oscillator frequency question

Part Number: DS90UB936-Q1

Hi team,

customer use a active crystal at Pin 5 of 936, The Crystal frequency is 25M, below is crystal datasheet and measure waveform.

but, they read reg 0xA5 of 936, it show only 23M, some times is 24M.

can you comments why the reg value is difference with actual crystal frequency?

thank you.

TSX-3225-爱普生晶振规格书.pdf