ExtClk cmos level?

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ToPh_1104671
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Table 49. External Clock Specifications
CMOS input level only.TTL input is not supported

   

I plan to run PRoC BLE at 5V, so what is these cmos level it wants?
As I have a 8MHz TTL clk available.

   

The ExtClk can not be doubled or multiplied? (PRoC does not have PLL ect?)

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