Recall that the two main
functions of the processor are control and arithmetic/logic. These are
represented by the control unit and the ALU, respectively, in the Von Neumann
The ALU includes registers
and circuits for doing the basic arithmetic and logical operations.
can be thought of as fast
are relatively few in
number (e.g., 16 or 32);
are typically large enough
to hold a single integer or floating point number;
are used to hold inputs
to, and outputs from, the arithmetic and logical operations;
are used for temporary
storage of intermediate results.
Last Updated 2001/10/10
L.Heath, 2000, extensively modified by J.A.N. Lee, 2001.