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

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

Specifications of ATMEGA644P-20AU

• 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: 44-TQFP, 44-VQFP
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: 2-Wire, SPI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 channel
• A/d Inputs: 8-Channel, 10-Bit
• Cpu Speed: 20 MIPS
• Eeprom Memory: 2K Bytes
• Input Output: 32
• Interface: 2-Wire/JTAG/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin TQFP
• Programmable Memory: 64K Bytes
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2.7-5.5 V
• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 20MHz
• Total Internal Ram Size: 4KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Controller Family/series: AVR MEGA
• No. Of I/o's: 32
• Eeprom Memory Size: 2KB
• Ram Memory Size: 4KB
• Rohs Compliant: Yes
• For Use With: ATSTK600-TQFP44 - STK600 SOCKET/ADAPTER 44-TQFPATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10. Datasheet Revision History
10.1
10.2
10.3
8011KS–AVR–09/08
Rev. 8011K- 09/08
Rev. 8011J- 09/08
Rev. 8011I- 05/08
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.
3.
4.
5.
1.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Updated
tion” on page 15
Updated V
Updated t
page
Updated typical values for ATmega324P and ATmega644P in the tables of
acteristics” on page
Replaced the package drawing
Updated ATmega644P
Updated description in
Updated
Updated Data Memory Map addresses,
Updated description of use of external capacitors in
on page
Updated typo
Updated bit description in
Updated typo in
Updated conditions for V
Updated
Updated conditions for V
teristics” on page
Updated Minimum Reference Voltage in
Characteristics” on page
Updated bit bit field typos in
332.
35.
”Stack Pointer” on page
”External Clock Drive” on page
”Features” on page
RST
OL
in the table of
in”Alternate Functions of Port C” on page
and t
”Programming via the JTAG Interface” on page
according to the updated 44M1 package drawing.
336.
BOD
326.
”AVCC” on page
”Errata” on page
unites in the table of
OL
INT2
336.
”TWSR – TWI Status Register” on page
in the table of
”DC Characteristics” on page
”Register Summary” on page
in
1,
”44M1” on page 426
Table 27-11
”Pin Configurations” on page 2
14.
Figure 7-2 on page
7.
331.
428.
ATmega164P/324P/644P
”DC Characteristics” on page
Table 27-12
(Single Ended channels) in
”System and Reset Characteristics” on
”Low Frequency Crystal Oscillator”
by a rev H update.
(Differential channels) in
86.
326.
414.
21.
and
313.
235.
”Ordering Informa-
326.
”ADC Charac-
”DC Char-
”ADC
23