Volatile

(Connection Properties window)

*.rbe\CONNECTION=\Advanced_Information\
Default\Register\Default\Volatile

If this value is True, the register value can change without the debugger explicitly modifying it. For example, a hardware timer continues to count even when the processor is halted.

Volatility indicates that the register has side-effects when accessed (read or write). Common read side-effects are the data is lost (such as pulled from a UART). Common write side-effects are the device takes some action on write (such as triggers a DMA). This information is used in the register window.