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Technical Support
On-Line Manuals
µVision User's Guide
About µVision
User Interface
Creating Applications
Debugging
Start Debugging
Start Energy Measurement without Debug
Application Program Execution
Debug Windows and Dialogs
Breakpoints Window
Call Stack and Locals Window
Code Coverage
Command Window
Component Viewer
Disassembly Window
Editor Window
Event Recorder
Setup Event Recorder
Event Recorder Window
Events Filtering
Event Statistics Window
Post-mortem Analysis
Event Viewer
Execution Profiler
Instruction Trace Window
System Analyzer
Usage tips
Save System Analyzer Contents
Statistics
Restrictions
Logic Analyzer
Setup
Setup in Detail
Restrictions
Cortex-M Trace Configuration
Memory Map
Memory Window
Performance Analyzer
Registers Window
Serial Window
Debug (printf) Viewer
Symbols Window
System Viewer
Adding System Viewer Windows
System and Thread Viewer
Thread States
Toolbox
Trace Data Window
Trace Navigation
Trace Exceptions
Event Counters
ULINKplus Window
Watch Window
Core Peripherals
Cortex-M0 and Cortex-M0+
CM0/M0+: Nested Vector Interrupt Controller
CM0/M0+: System Control and Configuration
CM0/M0+: System Tick Timer
Fault Reports (Cortex-M0+ only)
Cortex-M3, Cortex-M4, and Cortex-M7
CM3/M4/M7: Nested Vector Interrupt Controller
CM3/M4/M7: System Control and Configuration
CM3/M4/M7: System Tick Timer
CM3/M4/M7: Fault Reports
CM3/M4/M7: Memory Protection Unit
Cortex-M23/M33/M35P and Cortex-M55
Armv8-M: Nested Vector Interrupt Controller
Armv8-M: System Control and Configuration
Armv8-M: System Tick Timer
Armv8-M: Fault Reports
Armv8-M: Memory Protection Unit
Armv8-M: Security Attribution Unit
M-Profile Vector Extension (MVE)
Debug Scripting
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
Memory Attribution Specifiers
Operators
Differences between µVision and C
Expression Examples
Code and Data Trace (Cortex-M)
Trace Features
Configuring Trace
Tracepoint Expressions
Tracepoint Intrinsics
Tracepoint Limitations
Tracepoint Marks
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
TPIU Initialization after RESET (Cortex-M)
Prevent Opening Files
Show Japanese Messages
Debug Commands
Debug Functions
Simulation
Flash Programming
Dialogs
Utilities
Command Line
Example Programs
Appendix
Registers Window
The Registers window shows and allows modifying the content of registers, lists microcontroller operation modes, and system and internal states.
The toolbar button or the menu View -
Registers Window opens the window.
Where
| Register | Lists operation modes, register names, and CPU states. |
| Value | Shows the register content. Double-click on a value (or click on the value and press F2) to modify the content. |
- CPUs that have enabled TrustZone for Armv8-M, show the Secure and Non-Secure operation modes. This mode is also displayed in the Status Bar.
- The currently active mode is highlighted in black.
- Modified registers are highlighted in blue.
- CPUs with Floating Point Unit (FPU) show the corresponding registers in the FPU group.
- CPUs with Cortex-M Vector Extension (MVE) show the VPR register in the MVE group.
- Refresh the window content by halting program execution or clicking Update Windows from the Toolbox.
States Register
The register field States shows:
-
In Simulator mode:
The approximated cycle value. The memory system is not simulated. Thus, extra cycles required for memory accesses are not taken into account. -
For Cortex-M0/M0+/M1/M23
Not displayed. -
For Cortex-M3/M4/M7/M33/M35P/M55
Represents the target cycle counter, which is updated from the CoreSight Data Watchpoint and Trace unit Cycle Count (DWT_CYCCNT) register.
Sec Register
The register field Sec shows the elapsed time (in seconds) since debugging started and is based on the same information as States. The value is identical with the entry t0 of the Status Bar. Not displayed for Cortex-M0/M0+/M1/M23 devices.
See Also:
Information about additional counters can be found in:
- Event Counter for CMSIS-DAP.
- Event Counter for ULINKpro.
- Event Counter for ULINKplus.
- Event Counters Window for ULINK2.
- Event Counters Window for JLink.
Note
- The window content depends on the device in use. The picture above is an example from a Cortex-M3 processor based device.
- For Armv8-M implementations with Main and Security Extensions, the cycle counter does not increment if the CPU is in Secure state and DWT_CTRL.CYCDISS is set to 1.
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