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µVision User's Guide
µVision3 Overview User Interface Creating Applications Utilities 
Debugging Using the Debugger 
CPU Simulation Start Debugging Application Program Execution Debug Windows and Dialogs Breakpoints Code Coverage CPU Registers Disassembly Window Logic Analyzer Setup Setup in Detail Restrictions Memory Window Memory Map Output Window - Command Debug Commands Variables and Registers Debug Functions Execution Profiler Performance Analyzer Serial Window Symbol Window Toolbox Watch Window Expressions 
Constants System Variables Peripheral Variables I/O Ports Serial Ports Program Variables (Symbols) Line Numbers Bit Addresses Type Specifications Operators Differences Between µVision3 and C Expression Examples Tips and Tricks Review Peripherals and CPU Configuration Simulate I/O Ports Simulate Interrupts and Clock Inputs Simulate external I/O Devices Assign Serial I/O to a PC COM Port Check Illegal Memory Accesses Command Input from File Preset I/O Ports or Memory Contents Write Debug Output to a File Keyboard Shortcuts Debug Commands Debug Functions Simulation Flash Programming Dialogs Example Programs Command Line AppendixSimulate external I/O Devices
External I/O devices are typical memory mapped. You may simulate such I/O devices with the Memory Window provided in the µVision3 debugger. Since the C user program does not contain any variable declarations for such memory regions it is required that you map this memory with the MAP command:
MAP 0x100000, 0x100FFF READ WRITE /* MAP memory for I/O area */
You may use breakpoints in combination with debug functions to simulate the logic behind the I/O device.
Refer to User Functions for more information.
Example for a breakpoint definition:
BS WRITE 0x100000, 1, "IO_access ()"
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