LM3S328-IRN20-A0T Luminary Micro, Inc., LM3S328-IRN20-A0T Datasheet - Page 84

• Manufacturer Part Number: LM3S328-IRN20-A0T
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

System Control
84
Oscillator-Related Bits
Bit/Field
9:6
5:4
11
10
3
2
1
0
MOSCVER
MOSCDIS
IOSCVER
OSCSRC
IOSCDIS
BYPASS
PLLVER
Name
XTAL
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0xB
0x0
0
0
1
0
0
0
Preliminary
PLL Bypass
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
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.
Note:
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 85.
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
The ADC module must be clocked from the PLL or
directly from a 14-MHz to an 18-MHz clock source
in order to operate properly.
Input Source
Main oscillator (default)
Internal oscillator
Internal oscillator / 4 (this is necessary if used
as input to PLL)
reserved
April 27, 2007