Atmel AVR XMEGA AU series User Manual

449
8331B–AVR–03/12
Atmel AVR XMEGA AU
Notes: 1. If the EESAVE fuse is programmed, the EEPROM is preserved during chip erase.
33.12.3.1 Chip Erase
The chip erase command is used to erase the flash program memory, EEPROM and lock bits.
Erasing of the EEPROM depends on EESAVE fuse setting. Refer to ”FUSEBYTE5 – Fuse Byte
5” on page 34 for details. The user signature row, calibration row, and fuses are not affected.
1. Load the NVM CMD register with the chip erase command.
2. Set the CMDEX bit in the NVM CTRLA register. This requires the timed CCP sequence
during self-programming.
Once this operation starts, the PDI bus between the PDI controller and the NVM is disabled, and
the NVMEN bit in the PDI STATUS register is cleared until the operation is finished. Poll the
NVMEN bit until this is set, indicating that the PDI bus is enabled.
The BUSY flag in the NVM STATUS register will be set until the operation is finished.
33.12.3.2 Read NVM
The read NVM command is used to read the flash, EEPROM, fuses, and signature and calibra-
tion row sections.
0x38 Application section CRC CMDEX Y Y
Boot Loader Section
0x68 Erase boot section
PDI write N Y
0x2A Erase boot loader section page
PDI write N Y
0x2C Write boot loader section page
PDI write N Y
0x2D
Erase and write boot loader section page PDI write N Y
0x39 Boot loader section CRC
NVMAA Y Y
Calibration and User Signature Sections
0x01 Read user signature row
PDI read N N
0x18 Erase user signature row
PDI write N Y
0x1A Write user signature row
PDI write N Y
0x02 Read calibration row
PDI read N N
Fuses and Lock Bits
0x07 Read fuse
PDI read N N
0x4C Write fuse
PDI write N Y
0x08 Write lock bits
CMDEX Y Y
EEPROM Page Buffer
0x33 Load EEPROM page buffer
PDI write N N
0x36 Erase EEPROM page buffer
CMDEX Y Y
EEPROM
0x30 Erase EEPROM CMDEX Y Y
0x32 Erase EEPROM page PDI write N Y
0x34 Write EEPROM page PDI write N Y
0x35 Erase and write EEPROM page PDI write N Y
0x06 Read EEPROM PDI read N N
CMD[6:0] Commands / Operation Trigger
Change
Protected NVM Busy

Atmel AVR XMEGA AU series Specifications

General

Brand	Atmel
Model	AVR XMEGA AU series
Category	Microcontrollers
Language	English