Preserving the Debugger Operating Environment
http://www.mcg.mot.com/literature
4-11
4
Hardware Functions
The only hardware resources used by the debugger are the EIA-232-D
ports, which are initialized to interface to the debug terminal. If these ports
are reprogrammed, the terminal characteristics must be modified to suit, or
the ports should be restored to the debugger-set characteristics prior to
reinvoking the debugger.
Exception Vectors Used by 162Bug
The exception vectors used by the debugger are listed below. These
vectors must reside at the specified offsets in the target program’s vector
table for the associated debugger facilities (breakpoints & trace mode) to
operate.
When the debugger handles one of the exceptions shown in Table 4-2, the
target stack pointer is left pointing past the bottom of the exception stack
frame created; that is, it reflects the system stack pointer values just before
the exception occurred. In this way, the operation of the debugger facility
(through an exception) is transparent to users.
Table 4-2. Exception Vectors Used by 162Bug
Vector
Offset
Exception
162Bug Facility
$10
Illegal instruction
Breakpoints (used by GO, GN, GT)
$24
Trace
Trace operations (such as T, TC, TT)
$80-$B8
TRAP #0 - #14
Used internally
$BC
TRAP #15
System calls
NOTE 1
Level 7 interrupt
ABORT
pushbutton
NOTE 2
Level 7 interrupt
AC Fail
$DC
FP Unimplemented Data
Type
Software emulation and data type
conversion of floating point data.
NOTES:
1.
This depends on what the Vector Base Register (VBR) is set to
in the MCchip.
2.
This depends on what the Vector Base Register (VBR) is set to
in the VMEchip2.
Содержание MVME162LX 200 Series
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