ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 572

• Manufacturer Part Number: ATMEGA644A-PU
• Description: IC MCU AVR 64K FLASH 40PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644A-PU

• 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): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: JTAG, TWI, SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

34. Datasheet Revision History
34.1
8272A–AVR–01/10
Rev. 8272A - 01/10
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.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
1.
2.
Initial revision (Based on the ATmega164PA/324PA/644PA/1284P datasheet 8252G-AVR-11/09
and on the ATmega644 datasheet 2593N-AVR-09/09).
Changes done:
– Non-picoPower devices added: ATmega164A/324A/644A/1284
– Updated
– Updated
– Updated
– Updated
– Updated
– Updated
– Added
– Added
– Added
– Added
– Added
– Added
– Added
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– Added
– Added
”DC Characteristics” on page 327
”ATmega164A Typical Characteristics” on page 343
”ATmega324A Typical Characteristics” on page 395
”ATmega644A Typical Characteristics” on page 447
”ATmega1284 Typical Characteristics” on page 499
”Ordering Information” on page 558
”Errata for ATmega164A” on page 571
”Errata for ATmega324A” on page 571
”Errata for ATmega644PA” on page 571
”Errata for ATmega1284” on page 571
Table 2-1 on page 6
Table 9-1 on page 43
”Sleep Modes” on page 43
”Register Description” on page 68
”USART” on page 172
”Signature Bytes” on page 298
and
and
”USART in SPI Mode” on page 199
and
”BOD Disable
for non-picoPower devices.
for non-picoPower devices
”Page Size” on page 298
(1)
” on page 44
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