Register 17: Precision Internal Oscillator Calibration (PIOSCCAL), offset 0x150
This register provides the ability to update or recalibrate the precision internal oscillator. Note that
a 32.768-kHz oscillator must be used as the Hibernation module clock source for the user to be
able to calibrate the PIOSC.
Precision Internal Oscillator Calibration (PIOSCCAL)
Base 0x400F.E000
Offset 0x150
Type RW, reset 0x0000.0000
16171819202122232425262728293031
reservedUTEN
RORORORORORORORORORORORORORORORWType
0000000000000000Reset
0123456789101112131415
UTreservedUPDATECALreserved
RWRWRWRWRWRWRWRORWRWROROROROROROType
0000000000000000Reset
DescriptionResetTypeNameBit/Field
Use User Trim Value
DescriptionValue
The factory calibration value is used for an update trim operation.0
The trim value in bits[6:0] of this register are used for any update
trim operation.
1
0RWUTEN31
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.
0x0000ROreserved30:10
Start Calibration
DescriptionValue
No action.0
Starts a new calibration of the PIOSC. Results are in the
PIOSCSTAT register. The resulting trim value from the operation
is active in the PIOSC after the calibration completes. The result
overrides any previous update trim operation whether the
calibration passes or fails.
1
This bit is auto-cleared after it is set.
0RWCAL9
Update Trim
DescriptionValue
No action.0
Updates the PIOSC trim value with the UT bit or the DT bit in
the PIOSCSTAT register. Used with UTEN.
1
This bit is auto-cleared after the update.
0RWUPDATE8
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.
0ROreserved7
289June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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