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CHAPTER 3 REGISTER DESCRIPTIONS
3.3.3 Table Base Register (TBR)
The Table Base Register (TBR) designates the table containing the entry address for
"EIT" operations.
■ Overview of the Table Base Register
The Table Base Register (TBR) designates the table containing the entry address for "EIT" operations.
When an "EIT" condition occurs, the address of the vector reference is determined by the sum of the
contents of this register and the vector offset corresponding to the "EIT" operation.
Figure 3.3-7 shows an example of the operation of the table base register.
Figure 3.3-7 Sample of Table Base Register (TBR) Operation
Vector correspondence table
Vector no.
Vector offset
Timer
interrupt
11
H
3B8
H
bit310
EAddr0 EAddr1 EAddr2 EAddr3
EAddr0 EAddr1 EAddr2 EAddr3
PC
TBR
87654123
H
Adder
Vector table
+0 +1 +2 +387654123
H
+000003B8
H
876544DB
H
876544D8
H
The process of referencing a vector table involves application of address alignment rules
for word access.
Note: