Datasheet

21
2593OS–AVR–02/12
ATmega644
9.5 Rev. 2593K - 01/07
9.6 Rev. 2593J - 09/06
9.7 Rev. 2593I - 08/06
9.8 Rev. 2593H - 07/06
9.9 Rev. 2593G - 06/06
9.10 Rev. 2593F - 04/06
1 Removed the “Not recommended in new designs“ notice on page 1.
2. Updated Figure 2-1 on page 3.
3. Updated ”PCIFR – Pin Change Interrupt Flag Register” on page 62.
4. Updated Table 21-4 on page 248.
5. Added note to ”DC Characteristics” on page 316.
1. Updated ”Calibrated Internal RC Oscillator” on page 33.
2. Updated ”Fast PWM Mode” on page 117.
3. Updated ”Device Identification Register” on page 260.
4. Updated ”Signature Bytes” on page 287.
5. Updated Table 13-3 on page 97,Table 13-6 on page 98, Table 14-3 on page 126, Table 14-4 on
page 126, Table 14-5 on page 127, Table 15-3 on page 146, Table 15-6 on page 147 and Table
15-8 on page 148.
1. Updated note in ”Pin Configurations” on page 2.
2. Updated Table 7-2 on page 29, Table 12-11 on page 80 and Table 24-7 on page 280.
3. Updated ”Timer/Counter Prescaler” on page 145.
1. Updated ”Fast PWM Mode” on page 117.
2. Updated Figure 14-7 on page 118.
3. Updated Table 24-7 on page 280.
4. Updated ”Packaging Information” on page 362.
1. Updated ”Calibrated Internal RC Oscillator” on page 33.
2. Updated ”OSCCAL – Oscillator Calibration Register” on page 37.
3. Updated Table 26-1 on page 319.
1. Updated typos.
2. Updated ”ADC Noise Reduction Mode” on page 40.
3. Updated ”Power-down Mode” on page 40.