ATMEGA644-20AUR Atmel, ATMEGA644-20AUR Datasheet - Page 20

• Manufacturer Part Number: ATMEGA644-20AUR
• Description: MCU AVR 64K FLASH 20MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644-20AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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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All Register Descriptions moved to the end of their respective chapters.
Updated bit description on
Updated typos in “External Interrupts”
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”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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320, BODLEVEL Fuse Coding.
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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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Table 26-5, “2-wire Serial Bus Require-
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ATmega644
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have
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