atmega644v ATMEL Corporation, atmega644v Datasheet - Page 18

• Manufacturer Part Number: atmega644v
• Description: Atmega644 8-bit Avr Microcontroller With 64k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

8. Errata
8.1
8.2
8.3
18
Rev. C
Rev. B
Rev. A
ATmega644
• Inaccurate ADC conversion in differential mode with 200x gain
1. Inaccurate ADC conversion in differential mode with 200x gain
•
1. EEPROM read from application code does not work in Lock Bit Mode 3
EEPROM read from application code does not work in Lock Bit Mode 3.
With AVCC < 3.6V, random conversions will be inaccurate. Typical absolute accuracymay
reach 64 LSB.
Problem Fix/Workaround
None
Not sampled
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.
.
2593MS–AVR–08/07