LM3S600 Bookham Technology, Inc., LM3S600 Datasheet - Page 68
LM3S600
Manufacturer Part Number
LM3S600
Description
Microcontroller
Manufacturer
Bookham Technology, Inc.
Datasheet
1.LM3S600.pdf
(378 pages)
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System Control
68
Bit/Field
9:6
5:4
11
10
3
IOSCVER
OSCSRC
BYPASS
PLLVER
Name
XTAL
Type
R/W
R/W
R/W
R/W
R/W
Reset
0xB
0x0
1
0
0
Preliminary
Description
PLL Bypass
Chooses whether the system clock is derived from the PLL output or
the OSC source. If set, the clock that drives the system is the OSC
source. Otherwise, the clock that drives the system is the PLL output
clock divided by the system divider.
PLL Verification
This bit controls the PLL verification timer function. If set, the verification
timer is enabled and an interrupt is generated if the PLL becomes
inoperative. Otherwise, the verification timer is not enabled.
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:
Internal Oscillator Verification Timer
This bit controls the internal oscillator verification timer function. If set,
the verification timer is enabled and an interrupt is generated if the timer
becomes inoperative. Otherwise, the verification timer is not enabled.
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 (default)
Internal oscillator (default)
Internal oscillator / 4 (this is necessary if used as input to PLL)
reserved
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
October 01, 2007
reserved
reserved
reserved
reserved
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