Program status register wiki

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Can a lender stop you from register a new car if another car is in repo status in Florida? Study Guides. Trending Questions. What's the most outdated thing you still use today? Is it better to take a shower in the morning or at night? The meaning of a bit is either set 1 or true or cleared 0 or false. Flags [ edit edit source ] The condition of the MOS Technology 65xx CPUs is recorded by seven combined processor flags and control flags all within a single byte.

Also used for rotate and shift operations. Diagrammatically this can be seen as: The most commonly used flags are C bit 0 , Z bit 1 , N bit 7. In the exception handler the error reason can be analyzed and recover the system from the error, for example by terminating the task which caused the error.

In the case of a crash, the system can recover by simply resetting it. In more advanced scenarios, a crash dump could be generated before the reset, to be sent or saved on reboot. The system state that led to an exception can be analyzed with the HardFault Handler described above. Additionally some debuggers, such as Ozone provide special features to simplify the analysis.

When Ozone detects that the target system has crashed, it automatically analyzes the target state and provides all necessary information. The Exception Window displays the reason for the crash along with where it happened and the additional NVIC registers. The Call Stack Window can also unwind from an exception to enable easy navigation to the location of error, even across multiple exceptions. It can also be directly accessed with halfword access to 0xEED2A. It can be directly accessed with byte access ad 0xEED On exception entry, the exception handler can check which stack has been used when the fault happened.

On exception entry, some CPU registers are stored on the stack and can be read from there for error analysis. A project to test the faults is available here. Jump to: navigation , search. If a release configuration requires a HardFault handler, a specific HardFault handler should be included instead, which for example issues a reset or lits an error LED. Increment PC by 2 to skip break instruction.