IS_SFR - An identifier is a valid SFR

Language reference ›› Built-in functions ›› Conditional compilation ››
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is-sfr-function = IS_SFR "(" identifier [ "." subfield ] ")" .

NEW! (V2.0): Returns true if the given identifier and optional subfield exist and are SFR / SFR for the current processor.

Useful for conditional compilation, it will replace the use of DEFINED on SFRs where it was ambiguous (e.g.: it may conflict with user identifiers).