TM4C1237E6PZ Datasheet, PDF (79/1306 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C1237E6PZ Microcontroller
Bit/Field
15:10
9:8
7:0
Name
ICI / IT
reserved
ISRNUM
Type
RO
RO
RO
Reset
0x0
0x0
0x00
Description
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.
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.
IPSR ISR Number
This field contains the exception type number of the current Interrupt
Service Routine (ISR).
Value
Description
0x00
Thread mode
0x01
Reserved
0x02
NMI
0x03
Hard fault
0x04
Memory management fault
0x05
Bus fault
0x06
Usage fault
0x07-0x0A Reserved
0x0B
SVCall
0x0C
Reserved for Debug
0x0D
Reserved
0x0E
PendSV
0x0F
SysTick
0x10
Interrupt Vector 0
0x11
Interrupt Vector 1
...
...
0x9A
Interrupt Vector 138
See “Exception Types” on page 97 for more information.
The value of this field is only meaningful when accessing PSR or IPSR.
June 12, 2014
79
Texas Instruments-Production Data