SAM3X8C

Manufacturer Part NumberSAM3X8C
ManufacturerAtmel Corporation
SAM3X8C datasheets

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SAM3A4C PDF datasheetSAM3A4C PDF datasheet #2
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Page 45/72

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Figure 10-2. Clock Generator Block Diagram
10.6
Power Management Controller
The Power Management Controller provides all the clock signals to the system. It provides:
• 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
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.
11057AS–ATARM–10-Feb-12
11057AS–ATARM–10-Feb-12
Clock Generator
On Chip
32k RC OSC
XIN32
Slow Clock
Oscillator
XOUT32
XIN
3-20 MHz
Main
Oscillator
XOUT
On Chip
12/8/4 MHz
RC OSC
UPLL
Divider
/6 /8
PLL and
Divider A
Status
Control
Power
Management
Controller
SAM3X/A
SAM3X/A
XTALSEL
Slow Clock
SLCK
Main Clock
MAINCK
MAINSEL
HSCK
UPLL Clock
UPLLCK
PLLA Clock
PLLACK
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