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The default programming of the DE-SIM matches the reset values of the
6833x SIM (refer to the Motorola MC6833x User's Manual for specific
values).
If desired, the programming of the DE-SIM can be transferred into the 6833x
SIM with the sync_sim_registers to_6833x_from_config command. This
happens automatically each time a break to the monitor from emulation reset
occurs. This ensures that the 6833x is prepared to properly access memory
when a program is downloaded to the emulator.
Alternatively, the emulator's DE-SIM can be programmed from the 6833x SIM
with the sync_sim_registers from_6833x_to_config command. This is
useful if initialization code that configures the 6833x SIM exists, but you don't
know what its values are. In this case, you can use the default configuration,
run from reset to execute the initialization code, and use the
sync_sim_registers from_6833x_to_config command to configure the
emulator to match the 6833x SIM.
At any time, you can verify if the SIM and DE-SIM are programmed the same
with the sync_sim_registers difference command. Any differences
between the two register sets will be listed.
It should be noted that the DE-SIM module is programmed solely from the
EMSIM register set and is therefore static with respect to the application
program. No attempt is made to update the programming of the DE-SIM by
tracking instructions that will program the 6833x SIM.
This section shows you how to:
•
View the SIM register differences.
•
Synchronize to the 6833x SIM registers.
•
Synchronize to the EMSIM registers.
•
Restore default values in the EMSIM registers.
Using the Emulator
137
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