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LDC1000: About setting of PD_CLK in case of external TBCLK

Part Number: LDC1000

Hello support team,

I have a question regarding LDC1000.

In case that TBCLK is input from the outside, how do I set PD_CLK (0x05 [0])?
On page 21 of the data sheet (Rev. c), the following is described.
0: CLK_PD
         Crystal Power Down.
         0: Crystal drive enabled.
         1: Crystal drive is disabled. Use this setting to reduce power
            consumption with a crystal input when device is in Standby mode.
            Use this setting for clock input.

However, in case that the clock is input externally, inductance can not be measured unless PD_CLK is set to 0.
Is the above description wrong?

Best regards,
M. Tachibana