Datasheet

48
11011B–ATARM–21-Feb-12
SAM3N
•C
Carry or borrow flag:
0 = add operation did not result in a carry bit or subtract operation resulted in a borrow bit
1 = add operation resulted in a carry bit or subtract operation did not result in a borrow bit.
•V
Overflow flag:
0 = operation did not result in an overflow
1 = operation resulted in an overflow.
•Q
Sticky saturation flag:
0 = indicates that saturation has not occurred since reset or since the bit was last cleared to zero
1 = indicates when an
SSAT or USAT instruction results in saturation.
This bit is cleared to zero by software using an
MRS instruction.
10.4.3.7 Interrupt Program Status Register
The IPSR contains the exception type number of the current Interrupt Service Routine (ISR).
See the register summary in Table 10-2 on page 44 for its attributes. The bit assignments are:
•ISR_NUMBER
This is the number of the current exception:
0 = Thread mode
1 = Reserved
2 = NMI
3 = Hard fault
4 = Memory management fault
5 = Bus fault
6 = Usage fault
7-10 = Reserved
11 = SVCall
12 = Reserved for Debug
13 = Reserved
14 = PendSV
15 = SysTick
16 = IRQ0
26 = IRQ32
see “Exception types” on page 63 for more information.