LM3S1512_16 Datasheet, PDF (191/660 Pages) Texas Instruments – Stellaris LM3S1512 Microcontroller

Stellaris^® LM3S1512 Microcontroller
Bit/Field
9:6
5:4
3:2
1
Name
XTAL
OSCSRC
reserved
IOSCDIS
Type
R/W
R/W
RO
R/W
Reset
0xB
Description
Crystal Value
This field specifies the crystal value attached to the main oscillator. The
encoding for this field is provided below. Depending on the crystal used,
the PLL frequency may not be exactly 400 MHz (see Table
20-9 on page 611 for more information).
Value Crystal Frequency (MHz) Not Crystal Frequency (MHz) Using
Using the PLL
the PLL
0x0
1.000
reserved
0x1
1.8432
reserved
0x2
2.000
reserved
0x3
2.4576
reserved
0x4
3.579545 MHz
0x5
3.6864 MHz
0x6
4 MHz
0x7
4.096 MHz
0x8
4.9152 MHz
0x9
5 MHz
0xA
5.12 MHz
0xB
6 MHz (reset value)
0xC
6.144 MHz
0xD
7.3728 MHz
0xE
8 MHz
0xF
8.192 MHz
0x1
Oscillator Source
Selects the input source for the OSC. The values are:
Value Input Source
0x0 MOSC
Main oscillator
0x1 IOSC
Internal oscillator (default)
0x2 IOSC/4
Internal oscillator / 4
0x3 30 kHz
30-KHz internal oscillator
For additional oscillator sources, see the RCC2 register.
0x0
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.
0
Internal Oscillator Disable
0: Internal oscillator (IOSC) is enabled.
1: Internal oscillator is disabled.
July 15, 2014
191
Texas Instruments-Production Data