Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK Data Sheet
Product codes
ATSAM4E-EK
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
572
29.4
Slow Clock
The Supply Controller embeds a slow clock generator that is supplied with the VDDIO power supply. As soon as
the VDDIO is supplied, both the crystal oscillator and the embedded RC oscillator are powered up, but only the
embedded RC oscillator is enabled. This allows the slow clock to be valid in a short time (about 100 µs).
the VDDIO is supplied, both the crystal oscillator and the embedded RC oscillator are powered up, but only the
embedded RC oscillator is enabled. This allows the slow clock to be valid in a short time (about 100 µs).
The slow clock is generated either by the slow clock crystal oscillator or by the slow clock RC oscillator.
The selection between the RC or the crystal oscillator is made by writing the XTALSEL bit in the Supply Controller
Control register (SUPC_CR).
Control register (SUPC_CR).