DescriptionResetTypeNameBit/Field
EPSR ICI / IT status
These bits, along with bits 26:25, contain the Interruptible-Continuable
Instruction (ICI) field for an interrupted load multiple or store multiple
instruction or the execution state bits of the IT instruction.
When an interrupt occurs during the execution of an LDM, STM, PUSH
POP, VLDM, VSTM, VPUSH, or VPOP instruction, the processor stops the
load multiple or store multiple instruction operation temporarily and
stores the next register operand in the multiple operation to bits 15:12.
After servicing the interrupt, the processor returns to the register pointed
to by bits 15:12 and resumes execution of the multiple load or store
instruction. When EPSR holds the ICI execution state, bits 11:10 are
zero.
The If-Then block contains up to four instructions following a 16-bit IT
instruction. Each instruction in the block is conditional. The conditions
for the instructions are either all the same, or some can be the inverse
of others. See the Cortex™-M4 instruction set chapter in the ARM®
Cortex™-M4 Devices Generic User Guide (literature number ARM DUI
0553A) for more information.
The value of this field is only meaningful when accessing PSR or EPSR.
0x0ROICI / IT15:10
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x0ROreserved9:8
IPSR ISR Number
This field contains the exception type number of the current Interrupt
Service Routine (ISR).
DescriptionValue
Thread mode0x00
Reserved0x01
NMI0x02
Hard fault0x03
Memory management fault0x04
Bus fault0x05
Usage fault0x06
Reserved0x07-0x0A
SVCall0x0B
Reserved for Debug0x0C
Reserved0x0D
PendSV0x0E
SysTick0x0F
Interrupt Vector 00x10
Interrupt Vector 10x11
......
Interrupt Vector 1130x81
See “Exception Types” on page 114 for more information.
The value of this field is only meaningful when accessing PSR or IPSR.
0x00ROISRNUM7:0
95June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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