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UART TASKS_SUSPEND and sending a break

Hello everybody,

I have a few questions about the built-in UART (UART0) in the nRF51822.

  1. I've noticed some registers that aren't fully documented in nrf51.h of the sdk. I'd like to know what TASKS_SUSPEND does. I'm also curious about SHORTS and if there's anything to know about POWER.

  2. The UART can interrupt on a break (en.wikipedia.org/.../transmitter, which is great for my application (two UARTs, one on each chip, go to sleep as often as possible and wake each other with a break). Does the UART have the capability to send a break using a simple command, or must I bit-bang a break of the pin by switching the crossbar to GPIO?

Thank you!