Programmer’s Model
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Figure 2-2 Application Program Status Register bit assignments
Table 2-1 describes the bit assignments of the APSR.
Interrupt PSR
The Interrupt PSR (IPSR) contains the Interrupt Service Routine (ISR) number of the
current exception activation.
Figure 2-2 shows the bit assignments of the IPSR.
Figure 2-3 Interrupt Program Status Register bit assignments
31 30 29 28 27
N Z C V
0
ReservedQ
26
Table 2-1 Application Program Status Register bit assignments
Field Name Definition
[31] N Negative or less than flag:
1 = result negative or less than
0 = result positive or greater than.
[30] Z Zero flag:
1 = result of 0
0 = nonzero result.
[29] C Carry/borrow flag:
1 = carry or borrow
0 = no carry or borrow.
[28] V Overflow flag:
1 = overflow
0 = no overflow.
[27] Q Sticky saturation flag.
[26:0] - Reserved.
31 0
Reserved ISR NUMBER
89
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