ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 678

• Manufacturer Part Number: ATMEGA645A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA645A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, 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

vi
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
26 Memory Programming ......................................................................... 283
27 Electrical Characteristics .................................................................... 317
28 ADC Characteristics ........................................................................... 330
29 Typical Characteristics ........................................................................ 332
25.5Boot Loader Lock Bits .........................................................................................270
25.6Entering the Boot Loader Program ......................................................................271
25.7Addressing the Flash During Self-Programming .................................................272
25.8Self-Programming the Flash ................................................................................273
25.9Register Description ............................................................................................281
26.1Program And Data Memory Lock Bits .................................................................283
26.2Fuse Bits .............................................................................................................284
26.3Signature Bytes ...................................................................................................286
26.4Calibration Byte ...................................................................................................286
26.5Page Size ............................................................................................................286
26.6Parallel Programming Parameters, Pin Mapping, and Commands .....................286
26.7Parallel Programming ..........................................................................................289
26.8Serial Downloading .............................................................................................298
26.9Programming via the JTAG Interface ..................................................................304
27.1Absolute Maximum Ratings* ...............................................................................317
27.2DC Characteristics ..............................................................................................317
27.3Speed Grades .....................................................................................................324
27.4Clock Characteristics ...........................................................................................325
27.5System and Reset Characteristics ......................................................................326
27.6Power-on Reset ...................................................................................................326
27.7Brown-out Detection ............................................................................................327
27.8External Interrupts Characteristics ......................................................................327
27.9SPI Timing Characteristics ..................................................................................328
29.1ATmega165A ......................................................................................................332
29.2ATmega165PA ....................................................................................................365
29.3ATmega325A ......................................................................................................397
29.4ATmega325PA ....................................................................................................428
29.5ATmega3250A ....................................................................................................459
29.6ATmega3250PA ..................................................................................................490
29.7ATmega645A ......................................................................................................521
29.8ATmega645P ......................................................................................................553
8285B–AVR–03/11