ATSAM3U datasheet(39/62 Pages) ATMEL

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6430CS–ATARM–09-Apr-10

SAM3U Series

The Slow Clock generator is based on a 32 kHz crystal oscillator and an embedded 32 kHz RC

oscillator. The Slow Clock defaults to the RC oscillator, but the software can enable the crystal

oscillator and select it as the Slow Clock source.

The Supply Controller starts up the device by enabling the Voltage Regulator, then it generates

the proper reset signals to the core power supply.

It also enables to set the system in different low power modes and to wake it up from a wide

range of events.

10.5

Clock Generator

The Clock Generator is made up of:

• One Low Power 32768 Hz Slow Clock Oscillator with bypass mode

• One Low Power RC Oscillator

• One 3 to 20 MHz Crystal Oscillator, which can be bypassed

• One Fast RC Oscillator factory programmed, 3 output frequencies can be selected: 4, 8 or 12

MHz. By default 4 MHz is selected. 8 MHz and 12 MHz output are factory calibrated.

• One 480 MHz UPLL providing a clock for the USB High Speed Device Controller. Input

frequency is 12 MHz (only).

• One 96 to 192 MHz programmable PLL (PLL A), capable to provide the clock MCK to the

processor and to the peripherals. The input frequency of the PLL A is between 8 and 16 MHz.

Figure 10-2. Clock Generator Block Diagram

Power

Management

Controller

XIN

XOUT

Main Clock

MAINCK

UPLL Clock

UPLLCK

Control

Status

PLL and

Divider A

PLLA Clock

PLLACK

12M Main

Oscillator

PLL B

On Chip

32k RC OSC

Slow Clock

SLCK

XIN32

XOUT32

Slow Clock

Oscillator

Clock Generator

XTALSEL

HSCK

Divider

/6 /8

On Chip

12/8/4 MHz

RC OSC

MAINSEL

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