LM3S6918 Luminary Micro, Inc, LM3S6918 Datasheet - Page 62

• Manufacturer Part Number: LM3S6918
• Description: Lm3s6918 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

System Control
6.1.4
6.1.4.1
62
Figure 6-2. Power Architecture
Clock Control
System control determines the control of clocks in this part.
Fundamental Clock Sources
There are four clock sources for use in the device:
■
Internal Oscillator (IOSC): The internal oscillator is an on-chip clock source. It does not require
the use of any external components. The frequency of the internal oscillator is 12 MHz ± 30%.
+3.3V
VDD
VCCPHY
VCCPHY
VCCPHY
VCCPHY
VDD25
VDD25
VDD25
VDD25
VDDA
VDDA
VDD
VDD
VDD
VDD
LDO
Analog circuits
Logic and PLL
Low-noise
(ADC, analog
comparators)
I/O Buffers
Ethernet
LDO
Internal
PHY
Preliminary
GNDPHY
GNDPHY
GNDPHY
GNDPHY
GND
GND
GND
GND
GNDA
GNDA
GND
GND
GND
GND
July 26, 2008