Datasheet

210
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
If this bit is set to 1, an unaligned access generates a usage fault.
Unaligned LDM, STM, LDRD, and STRD instructions always fault irrespective of whether UNALIGN_TRP is set to 1.
• USERSETMPEND: Unprivileged Software Access
Enables unprivileged software access to the NVIC_STIR, see “Software Trigger Interrupt Register” :
0: Disable.
1: Enable.
• NONBASETHRDENA: Thread Mode Enable
Indicates how the processor enters Thread mode:
0: The processor can enter the Thread mode only when no exception is active.
1: The processor can enter the Thread mode from any level under the control of an EXC_RETURN value, see “Exception Return”
.