These text boxes are used to specify the default data types that should be used for each of the following:
The data types specified will be used when declaring data, and, in the case of signed integers and unsigned integers, will be used when using bit-wise shift operators.
The data type specified for Bit Field is used for conditions and bit data items. This text box is only enabled when the option (Use Macros For) Conditions and Bit Data Items on the General tab is not selected.