FOXBORO FBM237 RH914XS industrial control automation card module
Technical data of product parameters
The exception vectors used by the debugger are listed in Table FBM237 RH914XS
These vectors must reside at the specified offsets in the target
program’s vector table for the associated debugger facilities
(breakpoints, trace mode, etc.) to operate.
When the debugger handles one of the exceptions listed in Table
B-5, the target stack pointer is left pointing past the bottom of the
exception stack frame created; that is, it reflects the system stack FBM237 RH914XS
pointer values just before the exception occurred. In this way, the
operation of the debugger facility (through an exception) is
transparent to users. The start address of this target vector table area is the base address FBM237 RH914XS
($00) of the debugger memory. This address loads into the targetstate VBR at power-up or cold-start reset and can be observed by
using the RD command to display the target-state registers
immediately after power-up.
The Bug initializes the target vector table with the debugger vectors
listed in Table B-5 and fills the other vector locations with the
address of a generalized exception handler (refer to the Bug
Generalized Exception Handler section in this chapter). The target
program may take over as many vectors as desired by simply
writing its own exception vectors into the table. If the vector
locations listed in Table B-5 are overwritten, the accompanying
debugger functions are lost. FBM237 RH914XS
The 147Bug maintains a separate vector table for its own use. In
general, you do not have to be aware of the existence of the
debugger vector table. It is completely transparent and you should
never make any modifications to the vectors contained in it. Your program may create a separate vector table in memory to
contain its own exception vectors. If this is done, the program must
change the value of the VBR to point to the new vector table. In
order to use the debugger facilities you can copy the proper vectors
from the Bug vector table into the corresponding vector locations in
your program vector table.
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Introduction to main products
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reminder
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