438
8331B–AVR–03/12
Atmel AVR XMEGA AU
Notes: 1. The flash range CRC command used byte addressing of the flash.
2. Will depend on the flash section (application or boot loader) that is actually addressed.
3. This command is qualified with the lock bits, and requires that the boot lock bits are unprogrammed.
4. When using a command that changes the normal behavior of the LPM command; READ_USER_SIG_ROW and
READ_CALIB_ROW; it is recommended to disable interrupts to ensure correct execution of the LPM instruction.
33.11.2.1 Read Flash
The (E)LPM instruction is used to read one byte from the flash memory.
1. Load the Z-pointer with the byte address to read.
2. Load the NVM command register (NVM CMD) with the no operation command.
3. Execute the LPM instruction.
The destination register will be loaded during the execution of the LPM instruction.
33.11.2.2 Erase Flash Page Buffer
The erase flash page buffer command is used to erase the flash page buffer.
1. Load the NVM CMD with the erase flash page buffer command.
2. Set the command execute bit (NVMEX) in the NVM control register A (NVM CTRLA).
This requires the timed CCP sequence during self-programming.
The NVM busy (BUSY) flag in the NVM status register (NVM STATUS) will be set until the page
buffer is erased.
0x02E WRITE_FLASH_PAGE Write flash page SPM N/Y
(2)
YYZ-pointer -
0x2F ERASE_WRITE_FLASH_PAGE Erase and write flash page SPM N/Y
(2)
YYZ-pointer -
0x3A FLASH_RANGE_CRC
(3)
Flash range CRC CMDEX Y Y Y DATA/ADDR
(1)
DATA
Application Section
0x20 ERASE_APP Erase application section SPM Y Y Y Z-pointer -
0x22 ERASE_APP_PAGE Erase application section page SPM N Y Y Z-pointer -
0x24 WRITE_APP_PAGE Write application section page SPM N Y Y Z-pointer -
0x25 ERASE_WRITE_APP_PAGE Erase and write application section page SPM N Y Y Z-pointer -
0x38 APP_CRC Application section CRC CMDEX Y Y Y - DATA
Boot Loader Section
0x2A ERASE_BOOT_PAGE Erase boot loader section page SPM Y Y Y Z-pointer -
0x2C WRITE_BOOT_PAGE Write boot loader section page SPM Y Y Y Z-pointer -
0x2D
ERASE_WRITE_BOOT_PAGE Erase and write boot loader section page SPM Y Y Y Z-pointer -
0x39 BOOT_CRC Boot loader section CRC CMDEX Y Y Y - DATA
User Signature Row
0x01
(4)
READ_USER_SIG_ROW Read user signature row LPM N N N Z-pointer Rd
0x18 ERASE_USER_SIG_ROW Erase user signature row SPM Y Y Y - -
0x1A WRITE_USER_SIG_ROW Write user signature row SPM Y Y Y - -
Calibration Row
0x02
(4)
READ_CALIB_ROW Read calibration row LPM N N N Z-pointer Rd
Table 33-2. Flash self-programming commands (Continued).
CMD[6:0] Group Configuration Description Trigger
CPU
Halted
NVM
Busy
Change
Protected
Address
Pointer
Data
Registe
r
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