SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 45

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

10.6
11057AS–ATARM–10-Feb-12
11057AS–ATARM–10-Feb-12
Power Management Controller
Figure 10-2. Clock Generator Block Diagram
The Power Management Controller provides all the clock signals to the system. It provides:
The Supply Controller selects between the 32 kHz RC oscillator or the crystal oscillator. The
unused oscillator is disabled automatically so that power consumption is optimized.
By default, at startup the chip runs out of the Master Clock using the Fast RC Oscillator running
at 4 MHz.
• the Processor Clock HCLK
• the Free running processor clock FCLK
• the Cortex SysTick external clock
• the Master Clock MCK, in particular to the Matrix and the memory interfaces
• the USB OTG HS Clock UOTGCK
• independent peripheral clocks, typically at the frequency of MCK
• three programmable clock outputs: PCK0, PCK1 and PCK2
XOUT32
XIN32
XOUT
XIN
Management
Clock Generator
32k RC OSC
Slow Clock
3-20 MHz
12/8/4 MHz
Controller
Status
Oscillator
Oscillator
Divider A
PLL and
On Chip
On Chip
RC OSC
Power
Divider
Main
UPLL
/6 /8
Control
XTALSEL
Slow Clock
SLCK
Main Clock
MAINCK
MAINSEL
HSCK
UPLL Clock
UPLLCK
PLLA Clock
PLLACK
SAM3X/A
SAM3X/A
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