What does PMCR mean in UNCLASSIFIED
PMCR stands for Performance Monitor Control Register, and it is a type of special purpose register that is found in some processor architectures. This register provides a way to control performance monitoring features such as the collection of performance data, enabling events, monitoring counters and interrupting execution when predetermined conditions are met. This register is primarily used for debugging purposes and performance analysis.
PMCR meaning in Unclassified in Miscellaneous
PMCR mostly used in an acronym Unclassified in Category Miscellaneous that means Performance Monitor Control Register
Shorthand: PMCR,
Full Form: Performance Monitor Control Register
For more information of "Performance Monitor Control Register", see the section below.
Functionality
The functionality of the PMCR register varies depending on the specific architecture, but it generally allows for control over performance data collection. For example, it will usually enable or disable access to any monitored event block or counter which can be used to start/stop specific events from being monitored and collected. It can also be used to set up interrupt systems which stop execution upon reaching certain conditions. Additionally, the PMCR register often allows users to reset all monitored values back to zero at any given time or select individual counters to reset.
Usage
PMCR registers are mainly used by software developers for debugging applications. They allow for fine control over how certain operations are monitored and can make it easier to debug code if something goes wrong with its execution. The ability to capture events within a certain counter range can also help with tracking down bugs while also allowing users to gather more detailed information about their application's behavior above the level of instruction tracing alone. Additionally, having access to the PMCR register can help with analyzing performance in order to improve overall program efficiency.
Essential Questions and Answers on Performance Monitor Control Register in "MISCELLANEOUS»UNFILED"
What is the purpose of the PMCR register?
The PMCR register stands for Performance Monitor Control Register and it provides control over the performance monitoring logic in ARM Cortex-M processors. It allows users to enable the monitoring counters, set the event selection, start the counter and configure various operating modes.
What type of data can be tracked using a PMCR register?
With the help of a PMCR register, users can track events such as cycles, instructions executed, branches taken or mispredicted, cache and memory accesses including misses and data stalls.
How does the PMCR control logic work?
The PMCR control logic works by providing enable bits for each counter which allow users to specify which events they want to capture from their processor. Once enabled, each event has an associated input signal that triggers when its event occurs and increments its corresponding counter.
Can an interrupt be triggered using a PMCR?
Yes. An interrupt can be triggered with a Performance Monitor Control Register (PMCR). When it is enabled, it will generate an interrupt signal when certain predetermined events occur such as instructions executed or data stalls occurring.
Is there any limit to how many events can be monitored with a single PMCR?
Yes, generally most ARM Cortex-M processors feature up to four counters that can be used with a single PMCR. These counters can monitor one or multiple events depending on user selection.
Does accessing a Performance Monitor Control Register require special privileges?
No, regular user access without privileged access rights is enough to access a Performance Monitor Control Register (PMCR). Additionally, some processors also offer additional support for secure privileged access allowing secured applications to run while still having visibility into performance metrics.
What is the instruction length for programming a Performance Monitor Control Register?
Generally speaking, most microprocessors have an instruction length of 8 bytes while programming a Performance Monitor Control Register (PMCR). However this may vary depending on your specific architecture so it's important to check your processor's documentation before coding your applications.
How do you configure Cycle Counting with a Performance Monitor Control register?
To configure cycle counting with a Performance Monitor Control register (PMCR), you need to enable bit 0 of Counter 0 by setting bit 0 of CNTENSET in order for cycle count events to be recorded accurately in cycle_count registers. You then need to reset Counter 0 by writing 1 into CNTRESET in order for cycle counting to begin recording cycles after reset rather than from power up time specifically.
Final Words:
In conclusion, PMCR stands for Performance Monitor Control Register and it is an important component in some processor architectures which provides users with control over specific aspects of performance monitoring related tasks such as data collection, event enablement, counter manipulation and interrupts from pre-defined conditions being met. These registers are primarily utilized by software developers during debugging and performance analysis tasks.
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