LM3S6422 Datasheet, PDF (564/609 Pages) Texas Instruments – Stellaris® LM3S6422 Microcontroller

Electrical Characteristics
Table 18-9. Actual PLL Frequency
XTAL
0x4
0x5
0x6
0x7
0x8
0x9
0xA
0xB
0xC
0xD
0xE
0xF
Crystal Frequency (MHz)
3.5795
3.6864
4.0
4.096
4.9152
5.0
5.12
6.0
6.144
7.3728
8.0
8.192
PLL Frequency (MHz)
400.904
398.1312
400
401.408
398.1312
400
399.36
400
399.36
398.1312
400
398.6773333
Error
0.0023%
0.0047%
-
0.0035%
0.0047%
-
0.0016%
-
0.0016%
0.0047%
0.0047%
0.0033%
Table 18-10. Clock Characteristics
Parameter
Parameter Name
Min
Nom
Max
f_IOSC
Internal 12 MHz oscillator frequency
8.4
12
f_IOSC30KHZ
Internal 30 KHz oscillator frequency
15
30
f_MOSC
Main oscillator frequency
1
-
t_{MOSC_per}
Main oscillator period
125
-
f_{ref_crystal_bypass}
Crystal reference using the main oscillator
(PLL in BYPASS mode)^a
1
-
15.6
45
8.192
1000
8.192
f_{ref_ext_bypass}
External clock reference (PLL in BYPASS
0
mode)^a
-
25
f_{system_clock}
System clock
0
-
25
a. The ADC must be clocked from the PLL or directly from a 16-MHz clock source to operate properly.
Unit
MHz
KHz
MHz
ns
MHz
MHz
MHz
Table 18-11. 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)
8
±50
±5
Parallel
±25
27.8
14.3
120
10
16
100
Value
6
4
±50
±50
±5
±5
Parallel
Parallel
±25
±25
37.0
55.6
19.1
28.6
160
200
10
10
16
16
100
100
3.5
±50
±5
Parallel
±25
63.5
32.7
220
10
16
100
Units
MHz
ppm
ppm/yr
-
ppm
pF
mH
Ω
pF
pF
µW
564
June 18, 2012
Texas Instruments-Production Data