LM3S6422 Datasheet, PDF (169/609 Pages) Texas Instruments – Stellaris® LM3S6422 Microcontroller

Figure 5-4. Power Architecture
VDD
VCCPHY
VCCPHY
VCCPHY
VCCPHY
Ethernet
PHY
VDD25
VDD25
VDD25
VDD25
LDO
+3.3V
VDDA
VDDA
Internal
Logic and PLL
Low-noise
LDO
Analog circuits
Stellaris^® LM3S6422 Microcontroller
GNDPHY
GNDPHY
GNDPHY
GNDPHY
GND
GND
GND
GND
GNDA
GNDA
VDD
GND
VDD
GND
VDD
I/O Buffers
GND
VDD
GND
5.2.4
5.2.4.1
Clock Control
System control determines the control of clocks in this part.
Fundamental Clock Sources
There are multiple 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%.
June 18, 2012
169
Texas Instruments-Production Data