Datasheet

77
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
The processor sets EXC_RETURN bits[31:4] to 0xFFFFFFF . When this value is loaded into the PC it indicates to the
processor that the exception is complete, and the processor initiates the exception return sequence.
Table 10-10. Exception return behavior
EXC_RETURN[3:0] Description
bXXX0 Reserved.
b0001
Return to Handler mode.
Exception return gets state from MSP.
Execution uses MSP after return.
b0011 Reserved.
b01X1 Reserved.
b1001
Return to Thread mode.
Exception return gets state from MSP.
Execution uses MSP after return.
b1101
Return to Thread mode.
Exception return gets state from PSP.
Execution uses PSP after return.
b1X11 Reserved.