Datasheet

438
2549O–AVR–05/12
ATmega640/1280/1281/2560/2561
38.13 Rev. 2549C-09/05
38.14 Rev. 2549B-05/05
38.15 Rev. 2549A-03/05
9. Updated Note for Table 4 on page 43, Table 13-15 on page 86, Table 26-3 on page 289 and
Table 26-6 on page 295.
10. Updated Table 31-9 on page 377 and Table 31-10 on page 378.
11. Updated “Filling the Temporary Buffer (Page Loading)” on page 323.
12. Updated “Typical Characteristics” on page 385.
13. Updated “Packaging Information” on page 424.
14. Updated “Errata” on page 428.
1. Updated Speed Grade in section “Features” on page 1.
2. Added “Resources” on page 11.
3. Updated “SPI – Serial Peripheral Interface” on page 195. In Slave mode, low and high period SPI
clock must be larger than 2 CPU cycles.
4. Updated “Bit Rate Generator Unit” on page 247.
5. Updated “Maximum speed vs. V
CC
” on page 373.
6. Updated “Ordering Information” on page 419.
7. Updated “Packaging Information” on page 424. Package 64M1 replaced by 64M2.
8. Updated “Errata” on page 428.
1. JTAG ID/Signature for ATmega640 updated: 0x9608.
2. Updated Table 13-7 on page 81.
3. Updated “Serial Programming Instruction set” on page 352.
4. Updated “Errata” on page 428.
1. Initial version.