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Technical Support
On-Line Manuals
µVision User's Guide
About µVision
User Interface
Creating Applications
Utilities
Debugging
Using the Debugger
Simulation
Start Debugging
Application Program Execution
Debug Windows and Dialogs
Breakpoints Window
Call Stack and Locals Window
Code Coverage
Command Window
Disassembly Window
Event Viewer
Logic Analyzer
Setup
Setup in Detail
Restrictions
Memory Map
Memory Window
Performance Analyzer
Registers Window
Serial Window
Symbols Window
System Viewer
System and Thread Viewer
Thread States
Toolbox
Watch Window
Expressions
Constants
System Variables
Peripheral Variables
I/O Ports
Serial Ports
Program Variables (Symbols)
Fully Qualified Symbols
Non-Qualified Symbols
Literal Symbols
Using Symbols
Line Numbers
Bit Addresses
Type Specifications
Operators
Memory Type Specifiers
Differences between µVision 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 Access
Command Input from File
Preset I/O Ports or Memory Contents
Write Debug Output to a File
Keyboard Shortcuts
Prevent Opening Files
Debug Commands
Debug Functions
Simulation
Flash Programming
Dialogs
Example Programs
Command Line
Appendix
System Variables
System variables allow accessing specific functions and can be used anywhere program variables or expressions can be used. The system variables are listed in the table below.
| System Variable | Type | Description |
|---|---|---|
| $ | unsigned long | Represents the program counter. Use the
$-sign to display and change the program counter. For
example, $ = 0x4000 sets the program counter to
the address 0x4000. |
| _break_ | unsigned int | Halts program execution when set to a non-zero value. Use this variable in debug functions to halt program execution. |
| _traps_ | unsigned int | Displays messages for the 166 hardware traps when set to a non-zero value. 166-Hardware traps: Undefined Opcode, Protected Instruction Fault, Illegal Word Operand Access, Illegal Instruction Access, Stack Underflow and Stack Overflow. |
| states | unsigned long | Displays the CPU instruction state counter value (32 bit). It starts counting from 0 and increments with each executed instruction. |
| states64 | unsigned long long | Displays the CPU instruction state counter value (64 bit). It starts counting from 0 and increments with each executed instruction. |
| seconds | double | Displays execution time in seconds. This variable is available for some devices. |
| radix | unsigned int | Displays and sets the output base for numeric
values. radix can be 10 or 16. The default setting is 16
for HEX output. Change the output base by entering
radix=10 in the Command window. |
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