ATMEGA649A-AU Atmel, ATMEGA649A-AU Datasheet - Page 704

• Manufacturer Part Number: ATMEGA649A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA649A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• 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: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table of Contents
8284A–AVR–10/10
1
2
3
4
5
6
7
8
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 5
Resources ............................................................................................... 11
Data Retention ........................................................................................ 11
About Code Examples ........................................................................... 11
AVR CPU Core ........................................................................................ 12
AVR Memories ........................................................................................ 20
System Clock and Clock Options ......................................................... 30
1.1Pinout - 64A (TQFP) and 64M1 (QFN/MLF) ..............................................................2
1.2Pinout - 100A (TQFP) ................................................................................................3
1.3Pinout - 64MC (DRQFN) ...........................................................................................4
2.1Block Diagram ...........................................................................................................5
2.2Comparison Between
2.3Pin Descriptions ........................................................................................................8
6.1Overview .................................................................................................................12
6.2Architectural Overview ............................................................................................12
6.3ALU – Arithmetic Logic Unit ....................................................................................13
6.4AVR Status Register ...............................................................................................13
6.5General Purpose Register File ................................................................................15
6.6Stack Pointer ...........................................................................................................16
6.7Instruction Execution Timing ...................................................................................17
6.8Reset and Interrupt Handling ..................................................................................18
7.1In-System Reprogrammable Flash Program Memory .............................................20
7.2SRAM Data Memory ...............................................................................................21
7.3EEPROM Data Memory ..........................................................................................22
7.4I/O Memory ..............................................................................................................26
7.5General Purpose I/O Registers ...............................................................................26
7.6Register Description ................................................................................................27
8.1Clock Systems and their Distribution .......................................................................30
8.2Clock Sources .........................................................................................................31
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P 7
i