SAM4L Datasheet, PDF (253/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
In ATSAM4L4/L2, there are 12 generic clocks. These are allocated to different functions as
shown in Table 13-7.
Table 13-7. Generic Clock Allocation
Clock number Function
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
Master generic clock. Can be used as source for other
11
generic clocks.
Table 13-8.
OSCSEL
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Generic Clock Sources
Clock/Oscillator Description
RCSYS
System RC oscillator clock
OSC32K
Output clock from OSC32K
DFLL0
Output clock from DFLL0
OSC0
Output clock from Oscillator0
RC80M
Output from 80MHz RCOSC
RCFAST
Output from 4,8,12MHz RCFAST
RC1M
Output from 1MHz RC1M
CLK_CPU
The clock the CPU runs on
CLK_HSB
High Speed Bus clock
CLK_PBA
Peripheral Bus A clock
CLK_PBB
Peripheral Bus B clock
CLK_PBC
Peripheral Bus C clock
CLK_PBD
Peripheral Bus D clock
RC32K
Output from 32kHz RCOSC
reserved
42023C–SAM–02/2013
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