Datasheet
436
2549O–AVR–05/12
ATmega640/1280/1281/2560/2561
38.4 Rev. 2549L-08/07
38.5 Rev. 2549K-01/07
38.6 Rev. 2549J-09/06
38.7 Rev. 2549I-07/06
1. Updated note in Table 10-11 on page 47.
2. Updated Table 10-3 on page 43, Table 10-5 on page 44, Table 10-9 on page 47.
3. Updated typos in “DC Characteristics” on page 367
4. Updated “Clock Characteristics” on page 371
5. Updated “External Clock Drive” on page 371.
6. Added “System and Reset Characteristics” on page 372.
7. Updated “SPI Timing Characteristics” on page 375.
8. Updated “ADC Characteristics – Preliminary Data” on page 377.
9. Updated ordering code in “ATmega640” on page 419.
1. Updated Table 1-1 on page 3.
2. Updated “Pin Descriptions” on page 7.
3. Updated “Stack Pointer” on page 16.
4. Updated “Bit 1 – EEPE: EEPROM Programming Enable” on page 36.
5. Updated Assembly code example in “Thus, when the BOD is not enabled, after setting the ACBG
bit or enabling the ADC, the user must always allow the reference to start up before the output
from the Analog Comparator or ADC is used. To reduce power consumption in Power-down
mode, the user can avoid the three conditions above to ensure that the reference is turned off
before entering Power-down mode.” on page 63.
6: Updated “EIMSK – External Interrupt Mask Register” on page 115.
7. Updated Bit description in “PCIFR – Pin Change Interrupt Flag Register” on page 116.
8. Updated code example in “USART Initialization” on page 210.
9. Updated Figure 26-8 on page 284.
10. Updated “DC Characteristics” on page 367.
1. Updated “” on page 46.
2. Updated code example in “Moving Interrupts Between Application and Boot Section” on page
109.
3. Updated “Timer/Counter Prescaler” on page 186.
4. Updated “Device Identification Register” on page 303.
5. Updated “Signature Bytes” on page 338.
6. Updated “Instruction Set Summary” on page 416.
1. Added “Data Retention” on page 11.
2. Updated Table 16-3 on page 129, Table 16-6 on page 130, Table 16-8 on page 131, Table 17-2
on page 148, Table 17-4 on page 159, Table 17-5 on page 160,
Table 20-3 on page 187, Table
20-6 on page 188 and Table 20-8 on page 189.
3. Updated “Fast PWM Mode” on page 150.