ATmega644 Atmel Corporation, ATmega644 Datasheet - Page 20

• Manufacturer Part Number: ATmega644
• Manufacturer: Atmel Corporation

Specifications of ATmega644

• Flash (kbytes): 64 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 32
• Usb Speed: No
• Usb Interface: No
• Spi: 3
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

9. Datasheet Revision History
9.1
9.2
9.3
9.4
2593NS–AVR–07/10
Rev. 2593N - 07/10
Rev. 2593M - 08/07
Rev. 2593L - 02/07
Rev. 2593K - 01/07
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.
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Updated
Corrected use of comma i formula for Rp in
ments,” on page 321
Corrected use of comma in example under
tion (percentage) in Active and Idle mode,” on page 332
Note 6 and Note 7 in
been removed
Updated document according to Atmel standard use of technical terminology
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Updated description in
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Updated code example in
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All Register Descriptions moved to the end of their respective chapters.
Updated bit description on
Updated typos in “External Interrupts”
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Added note to
”System and Reset Characteristics” on page
Table 26-4 on page
”Features” on page
”Power-on Reset” on page
”Brown-out Detection” on page
”Internal Voltage Reference” on page
Table 24-7 on page
Figure 2-1 on page
”PCIFR – Pin Change Interrupt Flag Register” on page
Table 21-4 on page
”DC Characteristics” on page
Table 26-5, “2-wire Serial Bus Requirements,” on page 321
”Stack Pointer” on page
”MCUCR – MCU Control Register” on page
page 153
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Section 11.1.6 on page 63
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Table 27-2, “Additional Current Consump-
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ATmega644
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