Motorola CPU32 User's Guide download pdf (Page 92)

CPU32 Emulation 91

Chapter 6: Using Internal Registers (SIM and EMSIM Registers)

Configuring the SIM Registers

Summary

If you have a boot ROM that initializes the SIM registers, you don’t have

to configure the EMSIM registers in order to load code and run your

target. It is a good idea to configure the EMSIM registers anyway, since

the EMSIM registers are used configure an analysis probe. Page 93

discusses how to copy the SIM registers into the EMSIM registers.

If you do not have a boot ROM, then you will need to initialize the

EMSIM registers first so that you can communicate with the memory of

the processor. Once the EMSIM registers are defined, then every reset

followed by a break will write the EMSIM registers to the processor’s

SIM registers.

Once you have configured the EMSIM registers, it is a good idea to save

a configuration. Loading the configuration will restore the values of all

configuration options, including the EMSIM registers.

How SIM Register Values are Set

These registers are typically initialized by the CPU32 executing the

reset initialization code. During development this code may not be

available or may not exist on the target system. To aid in development,

the most important of these registers can be set directly by the

emulator. This enables such functions as clock speed, chip selects, and

location of internal memory to be established prior to executing any

user code. Once these registers are set, resources in the target system

can be accessed in the same manner as the processor would access

them after executing the reset initialization code. Activities such as

downloading code into the target system can now be performed

through the emulator.

The emulator copy is identified by the prefix "EM" on the register name

(e.g. EMSYNCR is the emulator copy of the SYNCR register) and are

referred to as the EMSIM. The EMSIM registers are transferred to the

processor registers when the target processor is reset while it is

running in the BDM monitor.

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Motorola CPU32 User's Guide Page 92