Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet

42023E–SAM–07/2013

In ATSAM4L8/L4/L2, there are 12 generic clocks. These are allocated to different functions as
shown in 

. 

Generic Clock Allocation

0

DFLLIF main reference and GCLK0 pin 
(CLK_DFLLIF_REF)

1

DFLLIF dithering and SSG reference and GCLK1 pin 
(CLK_DFLLIF_DITHER)

2

AST and GCLK2 pin

3

CATB and GCLK3 pin

4

AESA

5

GLOC, TC0 and RC32KIFB_REF

6

ABDACB and IISC

7

USBC

8

TC1 and PEVC[0]

9

PLL0 and PEVC[1]

10

ADCIFE

11

Master generic clock. Can be used as source for other 
generic clocks.

Generic Clock Sources

0

RCSYS

System RC oscillator clock

1

OSC32K

Output clock from OSC32K

2

DFLL0

Output clock from DFLL0

3

OSC0

Output clock from Oscillator0

4

RC80M

Output from 80MHz RCOSC

5

RCFAST

Output from 4,8,12MHz RCFAST

6

RC1M

Output from 1MHz RC1M

7

CLK_CPU

The clock the CPU runs on

8

CLK_HSB

High Speed Bus clock

9

CLK_PBA

Peripheral Bus A clock

10

CLK_PBB

Peripheral Bus B clock

11

CLK_PBC

Peripheral Bus C clock

12

CLK_PBD

Peripheral Bus D clock

13

RC32K

Output from 32kHz RCOSC

14

reserved