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µVision3 User's Guide

µVision3 Overview User Interface Creating Applications Utilities Debugging Debug Commands Debug Functions Simulation Flash Programming Dialogs File Device Database License Management Single-User License Floating-User License Floating License Administrator Edit Find in Files Configuration Editor Colors & Fonts User Keywords Shortcut Keys Templates View Symbol Window Project Components, Enviornment, and Books Project Components Folders/Extensions Books Multi-Project Select Device Options Device Properties Target Target (Keil ARM) Target (Keil C51) Target (Keil C166) Target (Keil C251) Target (GNU ARM) Target (RealView ARM) Output Output (Keil) Output (GNU ARM) Output (RealView ARM) Listing Listing (Keil) Listing (GNU ARM) Listing (RealView ARM) User Keil EC++ Compiler Compiler Keil CA ARM Compiler Keil Cx51 Compiler Keil C166 Compiler Keil C251 Compiler GNU ARM C Compiler RealView ARM C Compiler Assembler Keil AA ARM Assembler Keil Ax51 Assembler Keil A166 Assembler Keil A251 Assembler GNU ARM Assembler RealView ARM Assembler Linker Keil LA Locate Keil LA Misc Keil BL51 Locate Keil BL51 Misc Keil Lx51 Locate Keil Lx51 Misc Keil L166 Locate Keil L166 Misc GNU ARM Linker RealView ARM Linker Debug Utilities Batch Build Debug Breakpoints Debug Settings Logic Analyzer Memory Map Performance Analyzer Function Editor Tools Setup PC-Lint Customize Tools Menu SVCS Configure Version Control Example Programs Command Line Appendix

Target (RealView ARM)

Xtal (MHz)
Specifies the XTAL frequency of your device. XTAL is used to configure the debugger and Flash programmer. Note that XTAL reflects the main oscillator externally connected to the device. 
Operating System
Select the RTX Kernel which adds the correct RTX library and enables kernel aware debugging.
Code Generation
Select ARM-Mode or Thumb-Mode for the application.
Use Cross-Module Optimization enables the linker feedback file that allows further code optimizations.
Select usage for the Floating Point Co-processor on devices that have a Vector Floating Point (VFP) co-processor:
  • not used: code generated does not use any VFP instructions (Compiler switch: none, Assembler switch: none)
  • library calls: compiler generates library calls that use VFP instructions (generates typically the smallest code and should be used when Thumb mode is selected) (Compiler switch: --fpu=softvfp+vfpv2, Assembler switch: --fpu=vfpv2)
  • in-line (strict ANSI): compiler mostly uses the VFP unit with in-line code (generates fast code that conforms to the ANSI standard).  (Compiler switch: --fpu=vfpu2, Assembler switch: --fpu=vfpv2)
  • in-line (fast): compiler uses for all VFP instructions in-line code (error checking does not always conform to the ANSI standard). (Compiler switch: --fpu=vfpv2 --fpmode=fast, Assembler switch: --fpu=vfpv2)

Use MicroLIB to change the C run-time library set for smallest code application code. MicroLIB is not fully ANSI compatible but sufficient for most small embedded applications.

Read/Only Memory Areas
Specify the RO areas (typically located in ROM space). The default check box before each entry enables the area globally for the application. Individual modules may be assigned in the Properties dialog to specific areas. Startup selects the area used for the Startup code.
Read/Write Memory Areas
Specify the ZI and RW areas (typically located in RAM space). The default check box before each entry enables the area globally for the application. Individual modules may be assigned in the Properties dialog to specific areas. Noinit selects areas that should be excluded from zero initialization.


  • The settings for Read/Only Memory Areas and Read/Write Memory Areas are used to create a linker scatter file. This requires that the setting Use Memory Layout from Target Dialog is enabled in the Linker dialog.
  • the Evaluation version of the RealView ARM tools do not support linker scatter file. As a result, the settings for Read/Only Memory Areas andRead/Write Memory Areas cannot be used.
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