Next: Instructions
Up: Description of the Hypothetical
Previous: Description of the Hypothetical
Figure 1:
Structure of Instructions
![\begin{figure}
\centering
\includegraphics[width=\textwidth]{graphics/Command}\end{figure}](img1.png) |
- OP-Code
- The code of an operation. See section Opcodes.
- D
- Mark for double-word instructions. The data is in the next
word if this bit is set. An Exception are the operations on the
stack where this bit is a part of the modification part.
- MOD
- Modification part. With these bits addressing modes,
stack- and indexoperations are selected.
- Address / Value
- In this part the data belonging to the
operation is stored.
Markus Hennecke
9/14/2003