LM3S317-IQN20-A0T Luminary Micro, Inc., LM3S317-IQN20-A0T Datasheet - Page 86

• Manufacturer Part Number: LM3S317-IQN20-A0T
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

System Control
86
Oscillator-Related Bits
Bit/Field
9:6
5:4
10
3
2
1
0
Table 6-3. PLL Mode Control
MOSCVER
MOSCDIS
IOSCVER
OSCSRC
IOSCDIS
PWRDN
PLLVER
Name
XTAL
1
0
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
OEN
X
0
Reset
0xB
0x0
Mode
Power down
Normal
0
0
0
0
0
Preliminary
This field specifies the crystal value attached to the main
This bit controls the internal oscillator verification timer
This bit controls the main oscillator verification timer
Main Oscillator Disable
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.
oscillator. The encoding for this field is provided in Table 6-4
on page 87.
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.
Internal Oscillator Disable
0: Internal oscillator is enabled.
1: Internal oscillator is disabled.
0: Main oscillator is enabled.
1: Main oscillator is disabled.
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
May 4, 2007