NXP Semiconductors LPC11U3x

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User manual Rev. 5.5 — 21 December 2016 437 of 523
NXP Semiconductors
UM10462
Chapter 24: LPC11U3x/2x/1x Appendix ARM Cortex-M0
See the instruction descriptions Section 24–24.4.7.6 and Section 24–24.4.7.7 for more
information about how to access the program status registers.
Application Program Status Register: The APSR contains the current state of the
condition flags, from previous instruction executions. See the register summary in
Table 24–413
for its attributes. The bit assignments are:
See Section 24.4.4.1.4 for more information about the APSR negative, zero, carry or
borrow, and overflow flags.
Interrupt Program Status Register: The IPSR contains the exception number of the
current Interrupt Service Routine (ISR). See the register summary in Table 24–413
for
its attributes. The bit assignments are:
Execution Program Status Register: The EPSR contains the Thumb state bit.
See the register summary in Table 24–413
for the EPSR attributes. The bit assignments
are:
Table 415. APSR bit assignments
Bits Name Function
[31] N Negative flag
[30] Z Zero flag
[29] C Carry or borrow flag
[28] V Overflow flag
[27:0] - Reserved
Table 416. IPSR bit assignments
Bits Name Function
[31:6] - Reserved
[5:0] Exception number This is the number of the current exception:
0 = Thread mode
1 = Reserved
2 = NMI
3 = HardFault
4-10 = Reserved
11 = SVCall
12, 13 = Reserved
14 = PendSV
15 = SysTick
16 = IRQ0
.
.
.
47 = IRQ31
48-63 = Reserved.
see Section 24–24.3.3.2
for more information.