LM3S617 Datasheet, PDF (86/379 Pages) List of Unclassifed Manufacturers – Microcontroller

System Control
Bit/Field
10
Name
PLLVER
Type
R/W
9:6
XTAL
R/W
Oscillator-Related Bits
5:4
OSCSRC
R/W
Reset
0
0xB
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 87.
0x0
Picks among the four input sources for the OSC. The
values are:
Value Input Source
00
Main oscillator (default)
01
Internal oscillator
10
Internal oscillator / 4 (this is necessary if used
as input to PLL)
11
reserved
3
IOSCVER
R/W
2
MOSCVER
R/W
1
IOSCDIS
R/W
0
MOSCDIS
R/W
0
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.
0
This bit controls the main 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.
0
Internal Oscillator Disable
0: Internal oscillator is enabled.
1: Internal oscillator is disabled.
0
Main Oscillator Disable
0: Main oscillator is enabled.
1: Main oscillator is disabled.
Table 6-3. PLL Mode Control
PWRDN
1
0
OEN
X
0
Mode
Power down
Normal
86
May 4, 2007
Preliminary