TM4C1292NCPDT Datasheet, PDF (272/1822 Pages) Texas Instruments – Tiva Microcontroller

System Control
Register 10: Main Oscillator Control (MOSCCTL), offset 0x07C
This register provides control over the features of the main oscillator, including the ability to enable
the MOSC clock verification circuit, what action to take when the MOSC fails, and whether or not a
crystal is connected. When enabled, this circuit monitors the frequency of the MOSC to verify that
the oscillator is operating within specified limits. If the clock goes invalid after being enabled, the
microcontroller issues a power-on reset and reboots to the NMI handler or generates an interrupt.
Main Oscillator Control (MOSCCTL)
Base 0x400F.E000
Offset 0x07C
Type RW, reset 0x0000.000C
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
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
OSCRNG PWRDN NOXTAL MOSCIM CVAL
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RW
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
Bit/Field
31:5
4
Name
reserved
OSCRNG
Type
Reset Description
RO 0x0000.000 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.
RW
0
Oscillator Range
Specifies the frequency range of operation of the oscillator.
Value Description
0 Low Frequency Range
1 High Frequency Range (equal to or greater than 10 MHz).
3
PWRDN
RW
1
Power Down
Provides user control over powering down the main oscillator circuit.
Value Description
0 Power to main oscillator circuit is enabled.
1 Main Oscillator circuit is powered down.
Note: This bit should be cleared when using a crystal and set for
single-ended mode.
272
June 18, 2014
Texas Instruments-Production Data