LM3S2110-IQN20-A0 Luminary Micro, Inc., LM3S2110-IQN20-A0 Datasheet - Page 453

• Manufacturer Part Number: LM3S2110-IQN20-A0
• Description: Microcontroller
• Manufacturer: Luminary Micro, Inc.

20.2
20.2.1
20.2.2
November 29, 2007
AC Characteristics
Load Conditions
Unless otherwise specified, the following conditions are true for all timing measurements. Timing
measurements are for 4-mA drive strength.
Figure 20-1. Load Conditions
Clocks
Table 20-6. Phase Locked Loop (PLL) Characteristics
a. The exact value is determined by the crystal value programmed into the XTAL field of the Run-Mode Clock Configuration
b. PLL frequency is automatically calculated by the hardware based on the XTAL field of the RCC register.
Table 20-7. Clock Characteristics
Table 20-8. Crystal Characteristics
Parameter
f
f
f
T
f
f
f
t
f
f
f
Parameter Name
Frequency
Frequency tolerance
Aging
Oscillation mode
Temperature stability (0 - 85 °C)
Motional capacitance (typ)
ref_crystal
ref_ext
pll
IOSC
IOSC30KHZ
MOSC
MOSC_per
ref_crystal_bypass
ref_ext_bypass
system_clock
READY
Parameter
pin
(RCC) register.
Parameter Name
Crystal reference
External clock reference
PLL frequency
PLL lock time
Parameter Name
Internal 12 MHz oscillator frequency
Internal 30 KHz oscillator frequency
Main oscillator frequency
Main oscillator period
Crystal reference using the main oscillator (PLL in BYPASS mode)
External clock reference (PLL in BYPASS mode)
System clock
GND
C
L
b
= 50 pF
a
Parallel
a
27.8
±50
±25
±5
3.579545
3.579545
8
Min
-
-
Parallel
Preliminary
37.0
±50
±25
±5
6
Nom
Value
400
-
-
-
Parallel
55.6
±50
±25
8.192
8.192
±5
Max
4
0.5
-
Parallel
MHz
MHz
MHz
Unit
ms
63.5
±50
±25
3.5
±5
Units
ppm/yr
MHz
ppm
ppm
pF
Min
125
8.4
21
1
1
0
0
Nom
LM3S2110 Microcontroller
12
30
-
-
-
-
-
1000
Max
15.6
39
25
25
8
8
MHz
MHz
MHz
MHz
MHz
Unit
KHz
ns
453