This is a common question to those new to Fortran. The Fortran way of doing this is not to call a routine, as in other languages, but to use a special form of I/O statements called "internal I/O". With internal I/O, you specify a character variable in place of the unit number. You can do formatted or list-directed internal I/O. (You can even use character arrays, in which eash array element is considered a "record".)
So in your case you would want something like:
READ (CRECY, '(BN,I13)') intvar
Some people would use list-directed (format *) here, but I recommend against it because list-directed is too permissive in what it will accept. If you know that the input is always a well-formed integer, you can use:
READ (CRECY, *) intvar
instead.
