Data Sheet

160
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
Figure 16-3. CK and CLK_FDPLL96M Off Mode to Running Mode
Figure 16-4. CK and CLK_FDPLL96M Off Mode to Running Mode when Wake-Up Fast is Activated
Figure 16-5. CK and CLK_FDPLL96M Running Mode to Off Mode
16.6.8.5 Reference Clock Switching
When a software operation requires reference clock switching, the normal operation is to disable the FDPLL96M, modify
the DPLLCTRLB.REFCLK to select the desired reference source and activate the FDPLL96M again.
CKRx
ENABLE
CK
LOCK
$,45"#-&UTUBSUVQ@UJNF UMPDL@UJNF
CLK_FDPLL96M
CKRx
ENABLE
CK
LOCK
$,45"#-&UTUBSUVQ@UJNF UMPDL@UJNF
CLK_FDPLL96M
CKRx
ENABLE
CK
LOCK
CLK_FDPLL96M