Datasheet

20
2593OS–AVR–02/12
ATmega644
9. Datasheet Revision History
Please note that the referring page numbers in this section are referred to this document. The
referring revision in this section are referring to the document revision.
9.1 Rev. 2593O - 02/12
9.2 Rev. 2593N - 07/10
9.3 Rev. 2593M - 08/07
9.4 Rev. 2593L - 02/07
1. Datasheet changes status from preliminary to complete.
2. Updated the page layouts that include Atmel blue logo and new addresses on the last page.
1. Updated Table 26-4 on page 320, BODLEVEL Fuse Coding.
2. Corrected use of comma i formula for Rp in Table 26-5, “2-wire Serial Bus Requirements,” on
page 321
3. Corrected use of comma in example under Table 27-2, “Additional Current Consumption (per-
centage) in Active and Idle mode,” on page 332
4. Note 6 and Note 7 in Table 26-5, “2-wire Serial Bus Requirements,” on page 321 have been
removed
5. Updated document according to Atmel standard use of technical terminology
1. Updated ”Features” on page 1.
2. Updated description in ”Stack Pointer” on page 13.
3. Updated ”Power-on Reset” on page 46.
4. Updated ”Brown-out Detection” on page 47.
5. Updated ”Internal Voltage Reference” on page 48.
6. Updated code example in ”MCUCR – MCU Control Register” on page 58.
7. Added ”System and Reset Characteristics” on page 320.
8. All Register Descriptions moved to the end of their respective chapters.
1. Updated bit description on page 153
2. Updated typos in “External Interrupts” Section 11.1.6 on page 63
3. UpdatedTable 24-8 on page 280
4. Updated Table 24-7 on page 280.