By Jean J Labrosse; et al
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In fact, due to its somewhat dubious need, some compilers have dropped the requirement for this part of the definition, as it is not widely used. Other compilers may support the convention to only limited degrees, so consulting the documentation on the compiler is best if the feature is to be used. Access to a STRUCTURE from assembly language is simply a matter of using the name of the structure as a label within the assembly. However, access to the individual bits must be accomplished through the appropriate assembly language bit manipulation instructions.
This is not to say that a pointer can’t be used to access one type of data with another type’s definition. In fact, this is one of the more powerful capabilities of the pointer type. The syntax of the pointer data structure is also somewhat unique. The “*” sign is used as a prefix for the variable being accessed, to indicate that the data held in the variable is to be loaded into the pointer. The “&” sign is used as a prefix for the variable being accessed, to indicate that the address of the variable is to be loaded into the pointer.
The address of the byte containing the BIT is typically available through the variable’s label. The specific BIT within the byte may not be readily available, and may change as new variables are added to the design. For these reasons, it is generally best to only use manual access of a BIT defined using either a compiler function that allows the designer to specify the bit location, or a STRUCTURE. Using a STRUCTURE to define the location of a BIT is also useful in that it can be used to force the compiler to group specific variables together.