LM3S9B81 Datasheet, PDF (1086/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Electrical Characteristics
Table 25-10. 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%
25.2.2.2 PIOSC Specifications
Table 25-11. PIOSC Clock Characteristics
Parameter
f_PIOSC25
f_PIOSCT
Parameter Name
Min
Internal 16-MHz precision oscillator frequency variance, -
factory calibrated at 25 °C
Internal 16-MHz precision oscillator frequency variance, -
factory calibrated at 25 °C, across specified temperature
range
Nom
±0.25%
-
Max
Unit
±1%
-
±3%
-
25.2.2.3 Internal 30-kHz Oscillator Specifications
Table 25-12. 30-kHz Clock Characteristics
Parameter
Parameter Name
Min
f_IOSC30KHZ
Internal 30-KHz oscillator frequency
15
Nom
30
Max
45
Unit
KHz
25.2.2.4 Main Oscillator Specifications
Table 25-13. Main Oscillator Clock Characteristics
Parameter
Parameter Name
Min
Nom
Max
f_MOSC
Main oscillator frequency
1
-
t_{MOSC_PER}
Main oscillator period
61
-
t_{MOSC_SETTLE}
Main oscillator settling time
17.5
-
f_{REF_XTAL_BYPASS}
Crystal reference using the main oscillator
(PLL in BYPASS mode)^a
1
-
16.384
1000
20
16.384
f_{REF_EXT_BYPASS}
External clock reference (PLL in BYPASS
mode)^a
0
-
80
a. The ADC must be clocked from the PLL or directly from a 14- to 18-MHz clock source to operate properly.
Unit
MHz
ns
ms
MHz
MHz
Table 25-14. MOSC Oscillator Input Characteristics
Name
Frequency
Frequency tolerance
Oscillation mode
Equivalent series resistance
(max)
Load capacitance
Drive level (typ)
16
±100
parallel
70
16
100
12
±100
parallel
90
16
100
Value
8
6
±100
±100
parallel parallel
120
160
16
16
100
100
4
±100
parallel
200
16
100
3.5
±100
parallel
220
Condition
MHz
PPM
-
Ω
16
pF
100
µw
1086
Texas Instruments-Advance Information
June 29, 2010