Selecting The Emulation Monitor - HP 64751 User Manual

Selecting the Emulation Monitor

This section shows you how to:
•
Select the background monitor (implemented with the 68340 Background
Debug Mode (BDM)).
•
Select the foreground monitor program.
•
Use a custom foreground monitor program.
When you power up the emulator, or when you initialize it, the background monitor
is selected. You can also configure the emulator to use a foreground monitor.
Before the background and foreground monitors are described, you should
understand the foreground and background emulator modes as well as the function
of the emulation monitor.
Background
Background is the emulator mode in which emulation processor execution is
suspended.
Foreground
Foreground is the mode in which the emulator executes as if it were a real
microprocessor. The emulator is in foreground when it is running user programs or
running in a foreground monitor.
Function of the Monitor
The monitor is the interface between the emulation system controller (which
accepts and executes emulation commands) and the target system. The monitor
uses the emulation microprocessor because that's the only way to access registers,
single-port emulation memory, and target system memory.
When the emulation system controller recognizes that a command requires the
monitor, it writes a command code to a communications area and "breaks" emulator
execution into the monitor. The monitor reads this command (and any associated
parameters), makes the appropriate accesses, places the values in the
communication area, and returns emulator execution to its previous state.
Chapter 5: Configuring the Emulator
Selecting the Emulation Monitor
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