sam3s16 ATMEL Corporation, sam3s16 Datasheet - Page 33

• Manufacturer Part Number: sam3s16
• Description: At91sam Arm-based Flash Mcu
• Manufacturer: ATMEL Corporation

10.6
Figure 10-3. SAM3S16 Power Management Controller Block Diagram
11117AS–ATARM–12-Jul-11
Power Management Controller
MAINCK
PLLACK
PLLBCK
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 user can trim the 8 and 12 MHz RC Oscillator frequency by software.
• 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 Clock, UDPCK
• independent peripheral clocks, typically at the frequency of MCK
• three programmable clock outputs: PCK0, PCK1 and PCK2
SLCK
Master Clock Controller
MAINCK
PLLBCK
PLLBCK
PLLACK
SLCK
/1,/2,/4,...,/64
Prescaler
Programmable Clock Controller
USB Clock Controller
/1,/2,/4,...,/64
Prescaler
Sleep Mode
ON/OFF
Clock Controller
Processor
Controller
ON/OFF
Divider
Clock
Peripherals
ON/OFF
/8
SAM3S16 Preliminary
HCK
int
SystTick
FCLK
MCK
periph_clk[..]
pck[..]
UDPCK
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