LM3S102 Luminary Micro, Inc, LM3S102 Datasheet - Page 77

• Manufacturer Part Number: LM3S102
• Description: Lm3s102 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

July 6, 2006
Oscillator-Related Bits
Bit/Field
9:6
5:4
1:0
10
3
2
Table 6-3. PLL Mode Control
Table 6-4. Default Crystal Field Values and PLL Programming
MOSCVER
IOSCVER
OSCSRC
PWRDN
reserved
PLLVER
Name
XTAL
(XTAL Binary Value)
1
0
Crystal Number
0000-0011
0100
0101
Type
R/W
R/W
R/W
R/W
R/W
RO
OEN
X
0
Reset
reserved
3.579545 MHz
3.6864 MHz
0xB
0x0
Mode
Power down
Normal
0
0
0
0
Preliminary
Crystal Frequency (MHz)
Description
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.
This field specifies the crystal value attached to the main
oscillator. The encoding for this field is provided in Table 6-4
on page 77.
Picks among the four input sources for the OSC. The
values are:
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.
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.
Reserved bits return an indeterminate value, and should
never be changed.
This bit controls the internal oscillator verification timer
This bit controls the main oscillator verification timer
Value
00
01
10
11
Input Source
Main oscillator (default)
Internal oscillator
Internal oscillator / 4 (this is necessary if used
as input to PLL)
reserved
LM3S102 Data Sheet
77