LM3S2739 Datasheet, PDF (78/532 Pages) List of Unclassifed Manufacturers – Microcontroller

System Control
Bit/Field
5:4
Name
OSCSRC
Type
R/W
Reset
0x1
Description
Picks among the four input sources for the OSC. The values are:
Value Input Source
00 Main oscillator (default)
01 Internal oscillator (default)
10 Internal oscillator / 4 (this is necessary if used as input to PLL)
11 reserved
3:2
reserved
RO
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.
1
IOSCDIS
R/W
0
Internal Oscillator (IOSC) Disable
0: Internal oscillator is enabled.
1: Internal oscillator is disabled.
0
MOSCDIS
R/W
1
Main Oscillator Disable
0: Main oscillator is enabled.
1: Main oscillator is disabled (default).
Table 6-3. Default Crystal Field Values and PLL Programming
Crystal Number (XTAL Binary Value) Crystal Frequency (MHz) Not Using Crystal Frequency (MHz) Using the PLL
the PLL
0000
1.000
reserved
0001
1.8432
reserved
0010
2.000
reserved
0011
2.4576
reserved
0100
3.579545 MHz
0101
3.6864 MHz
0110
4 MHz
0111
4.096 MHz
1000
4.9152 MHz
1001
5 MHz
1010
5.12 MHz
1011
6 MHz (reset value)
1100
6.144 MHz
1101
7.3728 MHz
1110
8 MHz
1111
8.192 MHz
78
June 04, 2007
Preliminary