HP 64746 User Manual page 163

6 Modify your emulator configuration to specify a foreground monitor and specify
the address you chose and the filename you created (in this example the filename is
Mfmon68302.X for the Microtec or HP AxLS linker).
7 Make sure that the address range 0FFF000H through 0FFFFFFH is mapped as
"target RAM". This is important because the emulator will attempt to access the
on-chip locations of the 68302 upon entering the monitor. It uses the default
address for the BAR, placing the internal register section at address 0FFF000H.
Leaving this as guarded will cause a guarded access error — mapping it to
emulation RAM will cause unpredictable results.
If You Plan to Single-Step:
If you plan to single-step when using the foreground monitor, there's one more
thing you need to do. You need to ensure that the vector table entry at location 24H
points to the label "TRACE_ENTRY" in the foreground monitor module. You can
determine what this address is by looking at the listing file created when you
assembled the monitor. There are many approaches you can take to ensure this,
including:
•
Modify your own code to place the value of TRACE_ENTRY at location 24H.
This is probably the most "robust" method because you can account for things
such as a RAM-based vector table that is loaded by your initialization code.
•
Use a modify memory command to put the value of TRACE_ENTRY at 24H
after loading your program. This works fine if your program doesn't overwrite
or re-initialize the vector table during execution.
Chapter 5: Plugging into a Target System
Configuring the Emulator for In-Circuit Operation
163