ATMEGA644P-20AUR Atmel, ATMEGA644P-20AUR Datasheet - Page 23

• Manufacturer Part Number: ATMEGA644P-20AUR
• Description: MCU AVR 64K FLASH 20MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-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
8011OS–AVR–07/10
Rev. 8011O- 07/10
Rev. 8011N- 10/09
Rev. 8011M- 08/09
Rev. 8011L- 02/09
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.
1.
2.
1.
2.
1.
2.
3.
4.
5.
6.
1.
2.
3.
4.
5.
6.
6.
Corrected use of comma in formula for Rp in
ments,” on page 333
Updated document according to Atmel standard
Updated
Added
Updated
Removed VFBGA - pinout from
Updated
Updated Input Hysteresis Unit (V) in the “Typical Characteristics”.
Updated
Updated
Updated
Merged
Updated the front page by removing “Preliminary”.
Updated the
the table note 5.
Updated the table note1 of the
Updated
Updated
Table 6-8 on page
”Ordering Information” on page
”Packaging Information” on page
Sections
Section 6.5 ”Low Frequency Crystal Oscillator” on page 34
”Features” on page
”System Control and Reset” on page
”Features” on page 1
”Typical Characteristics” on page
”Typical Characteristics” on page 339
”DC Characteristics” on page 326
3.1,
3.2
and
34.
1.
3.3
by inserting a table note 1.
Table 25-6 on page
”Pin Configurations” on page
in one section
420. Removed 44MC and 49C2 packages.
423.
ATmega164P/324P/644P
339.
Table 25-10, “2-wire Serial Bus Require-
50.
by removing
”About” on page
332.
V
2.
IL3
/
V
9.
IH3
and V
OL3
/V
OH3
and
23