ATMEGA644_07 Datasheet, PDF (18/22 Pages) ATMEL Corporation – 8-bit Microcontroller with 64K Bytes In-System Programmable Flash

8. Errata
8.1 Rev. C
8.2 Rev. B
8.3 Rev. A
• Inaccurate ADC conversion in differential mode with 200x gain.
1. Inaccurate ADC conversion in differential mode with 200x gain
With AVCC < 3.6V, random conversions will be inaccurate. Typical absolute accuracymay reach
64 LSB.
Problem Fix/Workaround
None
Not sampled
• EEPROM read from application code does not work in Lock Bit Mode 3.
1. 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/Work around
Do not set Lock Bit Protection Mode 3 when the application code needs to read from EEPROM.
18 ATmega644
2593LS–AVR–02/07