There are some exceptions to the identifier formatting conventions described in Identifier Format Control.
Type name generation: name mangling conventions do not apply to type names (that is,
typedef statements) generated for global data types. If the
$R token is included in the Identifier format
control parameter specification, the model name is included in the
typedef. When generating type definitions, the Maximum
identifier length parameter is not respected.
Non-Auto storage classes: the Identifier format
control parameters specification does not
affect objects (such as signals and parameters) that have a
storage class other than Auto (such as
ImportedExtern or ExportedGlobal).
For shared utilities, code generation inserts the checksum specified by
$C to prevent name collisions in the following situations:
$C is specified without $N.
The length of $N plus the length of the text that you specify
exceeds the Maximum identifier length. Code generation
truncates $N and inserts an 8-character checksum where you
specified $C in the formatting scheme.
.