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Code and Data Coverage->Data Coverage
The simulator keeps track of which memory addresses have been accessed (read or written) during program execution. If Show Data Coverage is enabled from the Options menu, then these accessed memory locations will be highlighted with a pale green background in the memory views.
Data coverage is cleared when the program is restarted.
Data coverage information is stored with the rest of the microprocessor state data and so when you restore a captured state, the coverage information is also restored.
The Data Coverage setting is saved in the status file and so will be restored when you restart the simulator.