SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1370

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

44.6.8
1370
1370
SAM3X/A
SAM3X/A
Write Protection Registers
In order to provide security to the DACC, a write protection system has been implemented.
The write protection mode prevents the writing of certain registers. When this mode is enabled
and one of the protected registers is written, an error is generated in the
Status Register
the WPROTERR flag is set and the address of the corresponding canceled register write is
available in the WPROTADRR field of the
Due to the nature of the write protection feature, enabling and disabling the write protection
mode requires the use of a security code. Thus when enabling or disabling the write protection
mode the WPKEY field of the
ASCII code (corresponding to 0x444143) otherwise the register write is canceled.
The protected registers are:
DACC Mode Register
DACC Channel Enable Register
DACC Channel Disable Register
DACC Analog Current Register
and the register write request is canceled. When a write protection error occurs,
DACC Write Protect Mode Register
DACC Write Protect Status
must be filled with the “DAC”
Register.
DACC Write Protect
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12