Data Sheet

471
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
This flag is set when the entire frame in the transmit shift register has been shifted out and there are no new data
in DATA.
Writing a zero to this bit has no effect.
Writing a one to this bit will clear the flag.
z Bit 0 – DRE: Data Register Empty
This flag is cleared by writing new data to DATA.
This flag is set when DATA is empty and ready to be written.
Writing a zero to this bit has no effect.
Writing a one to this bit has no effect.