To Specify The Initial Value Of The Program Counter - HP MC68040 User Manual

Emulator, graphical user interface
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Chapter 8: Configuring the Emulator
Configuring the Emulator General Items Screen

To specify the initial value of the program counter

• Type in the address that is the initial value for the program counter in the text entry
area beside "Initial Program Counter Value".
Enter a 32-bit hexadecimal address for the initial value of the program counter.
Normally, this value is the same as the value at memory address 4. The default
value is 0FFFFFFFFH. This in an invalid value. It is given as the default to remind
you to enter the correct hexadecimal address for the program counter before using
the emulator.
Normally, if you run the emulator from reset, the processor fetches the value at
offset 4 from the vector table, and loads it into the program counter. There are
cases where the program counter value cannot be fetched from the reset vector
table. For example, if you reset the emulator, break to the emulation monitor, and
then run the emulator from the monitor, the program counter value will not be read
from the normal location. In these cases, the program counter value will be read
from the value you enter here.
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