LM3S9DN6_16 Datasheet, PDF (233/1391 Pages) Texas Instruments – Stellaris LM3S9DN6 Microcontroller

Stellaris^® LM3S9DN6 Microcontroller
Register 13: Precision Internal Oscillator Calibration (PIOSCCAL), offset 0x150
This register provides the ability to update or recalibrate the precision internal oscillator.
Precision Internal Oscillator Calibration (PIOSCCAL)
Base 0x400F.E000
Offset 0x150
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
UTEN
reserved
Type R/W
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
UPDATE reserved
UT
Type RO
RO
RO
RO
RO
RO
RO
R/W
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31
Name
UTEN
Type
R/W
Reset
0
Description
Use User Trim Value
Value Description
1 The trim value in bits[6:0] of this register are used for any update
trim operation.
0 The factory calibration value is used for an update trim operation.
30:9
reserved
RO
0x0000 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.
8
UPDATE
R/W
0
Update Trim
Value Description
1 Updates the PIOSC trim value with the UT bit. Used with UTEN.
0 No action.
This bit is auto-cleared after the update.
7
reserved
RO
0
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.
6:0
UT
R/W
0x0
User Trim Value
User trim value that can be loaded into the PIOSC.
Refer to “Main PLL Frequency Configuration” on page 202 for more
information on calibrating the PIOSC.
July 03, 2014
233
Texas Instruments-Production Data