When mass-producing a mask-ROM version after developing using a flash memory version, will some kind of code be written to areas not used by programs?
A1 Yes. Some values are read if data is read from an unused area due to a bug. If an used area where no code has been generated is read, the value read when debugging and that read from a mask-ROM version may be different. If the program operation depends on the value read from this area, the operations with the mask-ROM version is deferent from those at the step of debugging. Since this situation must be avoided, it is necessary to use the same value as the fill value for areas outside the code area, so that the operations with the mask-ROM version are the same as those at the step of debugging. To prevent problems that can occur after ordering mask-ROM version production, we also recommend using the -U option to specify an evaluation when filling.
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