Datasheet

637
Atmel | SMART SAM D20 [DATASHEET]
Atmel-42129K–SAM-D20_datasheet–06/2014
Clock System
Updated “Clock System” on page 73
z Updated the clock names in the Figure 13-1
z Updated the description of Generic Clock generators and Generic Clocks in the “Clock
Distribution” on page 73
z Updated Figure 13-2
z Synchronous Clock Controller renamed to Main clock controller
z Updated the description of “Read-Synchronization” on page 76
z Changed the title “Enable Write-Synchronization” to “Write-Synchronization of
CTRL.ENABLE” on page 76
z Updated “Clocks after Reset” on page 78
z Renamed GCLKMAIN to GCLK_MAIN
Generic Clock
Controller
z Updated the “Overview” on page 79 and renamed GCLK_PERIPH to
GCLK_PERIPHERAL throughout the datasheet
z Updated “Features” on page 79
z Updated “Block Diagram” on page 79
z Updated Figure 14-1
z Updated Figure 14-2 and added note
z Updated links in “Power Management” on page 80 and in “Clocks” on page 80
z Updated “Functional Description” on page 81
z Added links in “Initialization” on page 81 for GENDIV, GENCTRL and CLKCTRL
z Updated the Figure 14-3
z Renamed “External Clock” to “Generic Clock Output on I/O Pins” on page 83 and
updated the description
z Updated the Figure 14-4 and renamed it “Generic Clock Multiplexer”
z Updated the description of “Disabling a Generic Clock” on page 84
z Updated the Figure 14-5. GCLK becomes Generic Clock
z Updated links in “Run in Standby Mode” on page 85 and in “Synchronization” on
page 85
z Added a table note on the Reset in GENCTRL
z Added a third column “Generator Clock Source” to Table 14-7
z Replaced the text “if the generator is not used by the RTC” by the “if the generator is not
used by the RTC and not a source of a 'locked' generic clock
” in the Table 14-8 and in
Table 14-12
z Updated the Table 14-12