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Is it possible to fill unused areas in ROM with a certain value?

April 26, 2017areas certain possible ROM unused value

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Is it possible to fill unused areas in ROM with a certain value?

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Q1 I am trying to fill the unused area between the end of the program and the last ROM address with a particular data. But an error occurs when the DB pseudo instruction is used as follows. DB ( 7FFFH – !$ ) A1 Unfortunately, that pseudo instruction cannot be used as the assembler stage. Instead, the object converter is equipped with a special function that fills unused areas with a specified code. Use this function (-U option) to fill unused areas with any specified code. Ordinarily, when ordering a mask-ROM version, we recommend using this function to fill unused areas. For details, see the description of the object converter in the operation user’s manual.