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Travis
Employee
Employee
First solution authored Welcome! 500 replies posted
The processor modes are:
• Thread mode
Used to execute application software. The processor enters Thread mode when it
comes out of reset.
• Handler mode
Used to handle exceptions. The processor returns to Thread mode when it has
finished all exception processing.
The privilege levels for software execution are:
• Unprivileged
Unprivileged software executes at the unprivileged level.
The software:
– has limited access to the MSR and MRS instructions, and cannot use the CPS
instruction
– cannot access the system timer, NVIC, or system control block
– might have restricted access to memory or peripherals.
• Privileged
Privileged software executes at the privileged level.
The software can use all the instructions and has access to all resources.
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