Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
176
• USERSETMPEND
Enables unprivileged software access to the STIR, see “Software Trigger Interrupt Register” on page 162:
0: disable
1: enable.
• NONEBASETHRDENA
Indicates how the processor enters Thread mode:
0: processor can enter Thread mode only when no exception is active.
1: processor can enter Thread mode from any level under the control of an EXC_RETURN value, see “Exception return”
on page 76.