- Use internal RAM for stack pointer.
6. 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.
ATmega640/V-1280/V-1281/V-2560/V-2561/V [SUMMARY]
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2549QS–AVR–02/2014