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nRF51822 - SWDIO/SWDCLK Internal pull resistors

Hello. The nRF51822 Series Reference Manual says on page 38, "The SWDCLK pin has an internal pull down resistor and the SWDIO/nRESET pin has an internal pull up resistor."

What are the values of these pull resistors? If SWDCLK has an internal pulldown, why is an external pulldown required in the hardware design?

Thanks very much -