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Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller QFN 64 (9x9) 8-Bit 8 MHz I/O number 54
31323334353637383940
36
2549PS–AVR–10/2012
ATmega640/1280/1281/2560/2561
12. Datasheet Revision History
Please note that the referring page numbers in this section are referring to this document.The
referring revision in this section are referring to the document revision.
12.1 Rev. 2549P-10/2012
12.2 Rev. 2549O-05/12
12.3 Rev. 2549N-05/11
12.4 Rev. 2549M-09/10
1. Replaced drawing in 10.4 “64M2” on page 28.
2. Former page 439 has been deleted as the content of this page did not belong there (same page
as the last page).
3. Some small correction made in the setup.
1. The datasheet changed status from Preliminary to Complete. Removed “Preliminary” from the
front page.
2. Replaced Figure 10-3 on page 46 by a new one.
3. Updated the last page to include the new address for Atmel Japan site.
1. Added Atmel QTouch Library Support and QTouch Sensing Capablity Features
2. Updated Cross-reference in “Bit 5, 2:0 - WDP3:0: Watchdog Timer Prescaler 3, 2, 1 and 0” on
page 68
3. Updated Assembly codes in section “USART Initialization” on page 210
4. Added “Standard Power-On Reset” on page 372.
5. Added “Enhanced Power-On Reset” on page 373.
6. Updated Figure 32-13 on page 393
7. Updated “Ordering Information” on page 20 to include Tape & Reel devices.
1. Updated typos in Figure 26-9 on page 285 and in Figure 26-10 on page 285.
2. Note is added below Table 1-1 on page 3.
3. The values for “typical characteristics” in Table 31-9 on page 377 and Table 31-10 on page 378,
has been rounded.
4. Units for tRST and tBOD in Table 31-3 on page 372 have been changed from “ns” to “µs”.
5. The figure text for Table 31-2 on page 371 has been changed.
6. Text in first column in Table 30-3 on page 336 has been changed from “Fuse Low Byte” to
“Extended Fuse Byte”.
7. The text in “Power Reduction Register” on page 54 has been changed.
8. The value of the inductor in Figure 26-9 on page 285 and Figure 26-10 on page 285 has been
changed to 10 µH.
9. “Port A” has been changed into “Port K” in the first paragraph of “Features” on page 275.
10. Minimum wait delay for tWD_EEPROM in Table 30-16 on page 351 has been changed from
9.0ms to 3.6ms
11. Dimension A3 is added in “64M2” on page 28.
12. Several cross-references are corrected.