UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 20 December 2013 770 of 841
NXP Semiconductors
UM10360
Chapter 34: Appendix: Cortex-M3 user guide
– whether there are preempted active exceptions
– the exception number of the highest priority pending exception
– whether any interrupts are pending.
See the register summary in Table 654
, and the Type descriptions in Table 657, for the
ICSR attributes. The bit assignments are shown in Table 657
.
Table 657. ICSR bit assignments
Bits Name Type Function
[31] NMIPENDSET RW 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 enter the NMI exception handler as soon as it
registers a write of 1 to this bit, and entering the handler clears
this bit to 0. 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.
[30:29] - - Reserved.
[28] PENDSVSET RW 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.
[27] PENDSVCLR WO PendSV clear-pending bit.
Write:
0 = no effect
1 = removes the pending state from the PendSV exception.
[26] PENDSTSET RW 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.
To Next Page
Loading...
Need help?
General
