LM3S5739 Datasheet, PDF (795/856 Pages) Texas Instruments – Stellaris® LM3S5739 Microcontroller

Stellaris® LM3S5739 Microcontroller
Table 22-10. Actual PLL Frequency (continued)
XTAL
0x12
0x13
0x14
0x15
0x16
Crystal Frequency (MHz)
12.288
13.56
14.318
16.0
16.384
PLL Frequency (MHz)
401.408
397.76
400.90904
400
404.1386667
Error
0.0035%
0.0056%
0.0023%
-
0.010%
Table 22-11. Clock Characteristics
Parameter Parameter Name
Min
Nom
Max
f_IOSC
f_IOSC30KHZ
f_XOSC
f_{XOSC_XTAL}
f_{XOSC_EXT}
Internal 12 MHz oscillator frequency
8.4
12
15.6
Internal 30 KHz oscillator frequency
15
30
45
Hibernation module oscillator frequency
-
4.194304
-
Crystal reference for hibernation oscillator
-
4.194304
-
External clock reference for hibernation
-
32.768
-
module
f_MOSC
Main oscillator frequency
1
-
16.384
t_{MOSC_per}
Main oscillator period
61
-
1000
f_{ref_crystal_bypass}
Crystal reference using the main oscillator
(PLL in BYPASS mode)^a
1
-
16.384
f_{ref_ext_bypass}
External clock reference (PLL in BYPASS
0
mode)^a
-
50
f_{system_clock}
System clock
0
-
50
a. The ADC must be clocked from the PLL or directly from a 16-MHz clock source to operate properly.
Unit
MHz
KHz
MHz
MHz
KHz
MHz
ns
MHz
MHz
MHz
Table 22-12. Crystal Characteristics
Parameter Name
Frequency
Frequency tolerance
Aging
Oscillation mode
Temperature stability (-40°C to
85°C)
Motional capacitance (typ)
Motional inductance (typ)
Equivalent series resistance
(max)
Shunt capacitance (max)
Load capacitance (typ)
Drive level (typ)
16
±50
±5
Parallel
±25
13.9
7.15
80
10
16
100
12
±50
±5
Parallel
±25
18.5
9.5
100
10
16
100
Value
8
6
±50
±50
±5
±5
Parallel Parallel
±25
±25
27.8
37.0
14.3
19.1
120
160
10
10
16
16
100
100
4
±50
±5
Parallel
±25
55.6
28.6
200
10
16
100
3.5
±50
±5
Parallel
±25
Units
MHz
ppm
ppm/yr
-
ppm
63.5
pF
32.7
mH
220
Ω
10
pF
16
pF
100
µW
November 17, 2011
795
Texas Instruments-Production Data