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8331B–AVR–03/12
Atmel AVR XMEGA AU
• Bit 0 – CMDEX: Command Execute
Setting this bit will execute the command in the CMD register. This bit is protected by the config-
uration change protection (CCP) mechanism. Refer to ”Configuration Change Protection” on
page 13 for details on the CCP.
4.15.9 CTRLB – Control register B
• Bit 7:4 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
• Bit 3 – EEMAPEN: EEPROM Data Memory Mapping Enable
Setting this bit enables data memory mapping of the EEPROM section. The EEPROM can then
be accessed using load and store instructions.
• Bit 2 – FPRM: Flash Power Reduction Mode
Setting this bit enables power saving for the flash memory. If code is running from the applica-
tion section, the boot loader section will be turned off, and vice versa. If access to the section
that is turned off is required, the CPU will be halted for a time equal to the start-up time from the
idle sleep mode.
• Bit 1 – EPRM: EEPROM Power Reduction Mode
Setting this bit enables power saving for the EEPROM. The EEPROM will then be turned off in a
manner equal to entering sleep mode. If access is required, the bus master will be halted for a
time equal the start-up time from idle sleep mode.
• Bit 0 – SPMLOCK: SPM Locked
This bit can be written to prevent all further self-programming. The bit is cleared at reset, and
cannot be cleared from software. This bit is protected by the configuration change protection
(CCP) mechanism. Refer to ”Configuration Change Protection” on page 13 for details on the
CCP.
4.15.10 INTCTRL – Interrupt Control register
• Bit 7:4 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always
write these bits to zero when this register is written.
Bit 7 6 5 4 3 2 1 0
+0x0C – – – – EEMAPEN FPRM EPRM SPMLOCK CTRLB
Read/Write R R R R R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
+0x0D – – – – SPMLVL[1:0] EELVL[1:0] INTCTRL
Read/Write R R R R R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
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