Register 54: Auxiliary Control (ACTLR), offset 0x008
Note: This register can only be accessed from privileged mode.
The ACTLR register provides disable bits for IT folding, write buffer use for accesses to the default
memory map, and interruption of multi-cycle instructions. By default, this register is set to provide
optimum performance from the Cortex-M4 processor and does not normally require modification.
Auxiliary Control (ACTLR)
Base 0xE000.E000
Offset 0x008
Type RW, reset 0x0000.0000
16171819202122232425262728293031
reserved
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
0123456789101112131415
DISMCYCDISWBUFDISFOLDreservedDISFPCADISOOFPreserved
RWRWRWRORORORORORWRWROROROROROROType
0000000000000000Reset
DescriptionResetTypeNameBit/Field
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.
0x00ROreserved31:10
Disable Out-Of-Order Floating Point
Disables floating-point instructions completing out of order with respect
to integer instructions.
0RWDISOOFP9
Disable CONTROL.FPCA
Disable automatic update of the FPCA bit in the CONTROL register.
Important:
Two bits control when FPCA can be enabled: the ASPEN
bit in the Floating-Point Context Control (FPCC)
register and the DISFPCA bit in the Auxiliary Control
(ACTLR) register.
0RWDISFPCA8
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.
0x00ROreserved7:3
Disable IT Folding
DescriptionValue
No effect.0
Disables IT folding.1
In some situations, the processor can start executing the first instruction
in an IT block while it is still executing the IT instruction. This behavior
is called IT folding, and improves performance, However, IT folding can
cause jitter in looping. If a task must avoid jitter, set the DISFOLD bit
before executing the task, to disable IT folding.
0RWDISFOLD2
June 18, 2014164
Texas Instruments-Production Data
Cortex-M4 Peripherals
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