Atmel SAM4L-EK Atmel ATSAM4L-EK ATSAM4L-EK Data Sheet
Product codes
ATSAM4L-EK
903
42023E–SAM–07/2013
ATSAM4L8/L4/L2
Figure 33-2. Internal Trigger
Figure 33-3. External Trigger
33.6.4
Write Protection Registers
In order to provide security to the DACC, a write protection mode is implemented. This mode is
enabled by writing a one in Write Protect Enable (WPE) in the Write Protect Mode Register
(WPMR) and disabled by writing a zero. Writing to WPMR requires to write a security key in
Write Protect Key (WPMR.WPKEY). The value is “DAC” in ASCII, corresponding to 0x444143.
enabled by writing a one in Write Protect Enable (WPE) in the Write Protect Mode Register
(WPMR) and disabled by writing a zero. Writing to WPMR requires to write a security key in
Write Protect Key (WPMR.WPKEY). The value is “DAC” in ASCII, corresponding to 0x444143.
The write protection mode prevents the write of Mode Register. When this mode is enabled and
the protected registers is written, an error is generated in the Write Protect Status Register
(WPSR) and the register write request is canceled. When a write protection error occurs, the
Write Protection Error bit (WPROTERR) is set to one.
the protected registers is written, an error is generated in the Write Protect Status Register
(WPSR) and the register write request is canceled. When a write protection error occurs, the
Write Protection Error bit (WPROTERR) is set to one.