Datasheet
383
XMEGA B [DATASHEET]
8291B–AVR–01/2013
Table 30-2. Flash self-programming commands.
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.
5. For consistency the name Calibration Row has been renamed to Production Signature Row throughout the document.
30.11.2.1 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.
CMD[6:0] Group Configuration Description Trigger
CPU
Halted
NVM
Busy
Change
Protected
Address
Pointer
Data
Register
0x00 NO_OPERATION No operation / read flash -/(E)LPM -/N N -/N -/ Z-pointer -/Rd
Flash Page Buffer
0x23 LOAD_FLASH_BUFFER Load flash page buffer SPM N N N Z-pointer R1:R0
0x26 ERASE_FLASH_BUFFER Erase flash page buffer CMDEX N Y Y Z-pointer -
Flash
0x2B ERASE_FLASH_PAGE Erase flash page SPM N/Y
(2)
Y Y Z-pointer -
0x02E WRITE_FLASH_PAGE Write flash page SPM N/Y
(2)
Y Y Z-pointer -
0x2F ERASE_WRITE_FLASH_PAGE Erase and write flash page SPM N/Y
(2)
Y Y Z-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 - -
Production Signature (Calibration) Row
(5)
0x02
(4)
READ_CALIB_ROW Read calibration row LPM N N N Z-pointer Rd