Module icsr

Use the Interrupt Control State Register to set a pending Non-Maskable Interrupt (NMI), set or clear a pending PendSV, set or clear a pending SysTick, check for pending exceptions, check the vector number of the highest priority pended exception, check the vector number of the active exception.

Structs

ICSR_SPEC

Use the Interrupt Control State Register to set a pending Non-Maskable Interrupt (NMI), set or clear a pending PendSV, set or clear a pending SysTick, check for pending exceptions, check the vector number of the highest priority pended exception, check the vector number of the active exception.

Type Aliases

ISRPENDING_R

Field ISRPENDING reader - External interrupt pending flag

ISRPREEMPT_R

Field ISRPREEMPT reader - The system can only access this bit when the core is halted. It indicates that a pending interrupt is to be taken in the next running cycle. If C_MASKINTS is clear in the Debug Halting Control and Status Register, the interrupt is serviced.

NMIPENDSET_R

Field NMIPENDSET reader - Setting this bit will activate an NMI. Since NMI is the highest priority exception, it will activate as soon as it is registered.
NMI set-pending bit.
Write:
0 = No effect.
1 = Changes NMI exception state to pending.
Read:
0 = NMI exception is not pending.
1 = NMI exception is pending.
Because NMI is the highest-priority exception, normally the processor enters the NMI
exception handler as soon as it detects a write of 1 to this bit. Entering the handler then clears
this bit to 0. This means a read of this bit by the NMI exception handler returns 1 only if the
NMI signal is reasserted while the processor is executing that handler.

NMIPENDSET_W

Field NMIPENDSET writer - Setting this bit will activate an NMI. Since NMI is the highest priority exception, it will activate as soon as it is registered.
NMI set-pending bit.
Write:
0 = No effect.
1 = Changes NMI exception state to pending.
Read:
0 = NMI exception is not pending.
1 = NMI exception is pending.
Because NMI is the highest-priority exception, normally the processor enters the NMI
exception handler as soon as it detects a write of 1 to this bit. Entering the handler then clears
this bit to 0. This means a read of this bit by the NMI exception handler returns 1 only if the
NMI signal is reasserted while the processor is executing that handler.

PENDSTCLR_R

Field PENDSTCLR reader - SysTick exception clear-pending bit.
Write:
0 = No effect.
1 = Removes the pending state from the SysTick exception.
This bit is WO. On a register read its value is Unknown.

PENDSTCLR_W

Field PENDSTCLR writer - SysTick exception clear-pending bit.
Write:
0 = No effect.
1 = Removes the pending state from the SysTick exception.
This bit is WO. On a register read its value is Unknown.

PENDSTSET_R

Field PENDSTSET reader - SysTick exception set-pending bit.
Write:
0 = No effect.
1 = Changes SysTick exception state to pending.
Read:
0 = SysTick exception is not pending.
1 = SysTick exception is pending.

PENDSTSET_W

Field PENDSTSET writer - SysTick exception set-pending bit.
Write:
0 = No effect.
1 = Changes SysTick exception state to pending.
Read:
0 = SysTick exception is not pending.
1 = SysTick exception is pending.

PENDSVCLR_R

Field PENDSVCLR reader - PendSV clear-pending bit.
Write:
0 = No effect.
1 = Removes the pending state from the PendSV exception.

PENDSVCLR_W

Field PENDSVCLR writer - PendSV clear-pending bit.
Write:
0 = No effect.
1 = Removes the pending state from the PendSV exception.

PENDSVSET_R

Field PENDSVSET reader - PendSV set-pending bit.
Write:
0 = No effect.
1 = Changes PendSV exception state to pending.
Read:
0 = PendSV exception is not pending.
1 = PendSV exception is pending.
Writing 1 to this bit is the only way to set the PendSV exception state to pending.

PENDSVSET_W

Field PENDSVSET writer - PendSV set-pending bit.
Write:
0 = No effect.
1 = Changes PendSV exception state to pending.
Read:
0 = PendSV exception is not pending.
1 = PendSV exception is pending.
Writing 1 to this bit is the only way to set the PendSV exception state to pending.

R

Register ICSR reader

VECTACTIVE_R

Field VECTACTIVE reader - Active exception number field. Reset clears the VECTACTIVE field.

VECTPENDING_R

Field VECTPENDING reader - Indicates the exception number for the highest priority pending exception: 0 = no pending exceptions. Non zero = The pending state includes the effect of memory-mapped enable and mask registers. It does not include the PRIMASK special-purpose register qualifier.

W

Register ICSR writer