This dialog is displayed when you select the option Set New Start Address from the Stack pane context menu. Specify a Register or expression to be used to redefine the Stack Pointer when the Stack pane updates. For example, enter @R7 to use R7 as the Stack Pointer when stepping through your code. The evaluated address always appears at the top of the pane, with EP by the side of it, to distinguish it from the default Stack pointer (SP). Enter a blank expression to revert to the default (usually R13 for ARM processors).