LM3S1439 Luminary Micro, Inc, LM3S1439 Datasheet - Page 82
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LM3S1439
Manufacturer Part Number
LM3S1439
Description
Lm3s1439 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1439.pdf
(544 pages)
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System Control
82
Bit/Field
9:6
5:4
3:2
1
0
MOSCDIS
OSCSRC
IOSCDIS
reserved
Name
XTAL
Type
R/W
R/W
R/W
R/W
RO
Reset
0xB
0x1
0x0
0
1
Preliminary
Description
Crystal Value
This field specifies the crystal value attached to the main oscillator. The
encoding for this field is provided below.
Oscillator Source
Picks among the four input sources for the OSC. The values are:
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.
Internal Oscillator Disable
0: Internal oscillator (IOSC) is enabled.
1: Internal oscillator is disabled.
Main Oscillator Disable
0: Main oscillator is enabled .
1: Main oscillator is disabled (default).
Value
Value
0x0
0x1
0x2
0x3
0xC
0xD
0xA
0xB
0xE
0xF
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8
0x9
Input Source
Main oscillator
Internal oscillator (default)
Internal oscillator / 4 (this is necessary if used as input to PLL)
30 KHz internal oscillator
Crystal Frequency (MHz)
Not Using the PLL
1.8432
2.4576
1.000
2.000
6 MHz (reset value)
3.579545 MHz
3.6864 MHz
4.9152 MHz
7.3728 MHz
4.096 MHz
6.144 MHz
8.192 MHz
5.12 MHz
4 MHz
5 MHz
8 MHz
Crystal Frequency (MHz)
Using the PLL
reserved
reserved
reserved
reserved
July 25, 2008
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