During a debug session it is often helpful to be able to see variables represented in hexadecimal format as opposed to the default decimal format. The obvious Eclipse setting to change the Debug number format does not work in the version of Eclipse CDT on which Simplicity Studio is based and this Default number format settings have been removed from the latest version of Eclipse:
However there is an obscure way to change the default format from a debug session, it applies to hover windows and the other debug windows and it will persist across projects, debug sessions and Simplicity Studio restarts. From an active debug session, with the [Variables] tab selected, click the small white down arrow chevron in the upper right corner of the Variables dialog and select [Number Format] and then choose the desired option from the drop down list:
Hopefully this is useful information.