ATMEGA1280V ATMEL [ATMEL Corporation], ATMEGA1280V Datasheet - Page 30

• Manufacturer Part Number: ATMEGA1280V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

ATmega2561 rev. E
ATmega2561 rev. D
ATmega2561 rev. C
ATmega2561 rev. B
ATmega2561 rev. A
30
ATmega640/1280/1281/2560/2561
6. EEPROM read from application code does not work in Lock Bit Mode 3
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1. High current consumption in sleep mode.
Not sampled.
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High current consumption in sleep mode
Non-Read-While-Write area of flash not functional
Part does not work under 2.4 Volts
Incorrect ADC reading in differential mode
Internal ADC reference has too low value
IN/OUT instructions may be executed twice when Stack is in external RAM
EEPROM read from application code does not work in Lock Bit Mode 3
When the Memory Lock Bits LB2 and LB1 are programmed to mode 3, EEPROM
read does not work from the application code.
Problem Fix/Workaround
Do not set Lock Bit Protection Mode 3 when the application code needs to read from
EEPROM.
No known errata.
Not sampled.
If a pending interrupt cannot wake the part up from the selected sleep mode, the
current consumption will increase during sleep when executing the SLEEP instruc-
tion directly after a SEI instruction.
Problem Fix/Workaround
Before entering sleep, interrupts not used to wake the part from the sleep mode
should be disabled.
The Non-Read-While-Write area of the flash is not working as expected. The prob-
lem is related to the speed of the part when reading the flash of this area.
Problem Fix/Workaround
- Only use the first 248K of the flash.
- If boot functionality is needed, run the code in the Non-Read-While-Write area at
maximum 1/4th of the maximum frequency of the device at any given voltage. This
is done by writing the CLKPR register before entering the boot section of the code.
Non-Read-While-Write area of flash not functional
2549KS–AVR–01/07