ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 674

• 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

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ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
9
10 System Control and Reset .................................................................... 46
11 Interrupts ................................................................................................ 55
12 External Interrupts ................................................................................. 62
13 I/O-Ports .................................................................................................. 68
Power Management and Sleep Modes ................................................. 39
8.4Calibrated Internal RC Oscillator .............................................................................31
8.5Crystal Oscillator .....................................................................................................32
8.6Low-frequency Crystal Oscillator .............................................................................33
8.7External Clock .........................................................................................................35
8.8Timer/Counter Oscillator .........................................................................................36
8.9Clock Output Buffer .................................................................................................36
8.10System Clock Prescaler ........................................................................................36
8.11Register Description ..............................................................................................37
9.1Overview .................................................................................................................39
9.2Sleep Modes ...........................................................................................................39
9.3BOD Disable
9.4Idle Mode .................................................................................................................40
9.5ADC Noise Reduction Mode ...................................................................................40
9.6Power-down Mode ..................................................................................................40
9.7Power-save Mode ...................................................................................................41
9.8Standby Mode .........................................................................................................41
9.9Power Reduction Register .......................................................................................41
9.10Minimizing Power Consumption ............................................................................41
9.11Register Description ..............................................................................................44
10.1Resetting the AVR .................................................................................................46
10.2Reset Sources .......................................................................................................46
10.3Internal Voltage Reference ....................................................................................50
10.4Watchdog Timer ....................................................................................................50
10.5Register Description ..............................................................................................53
11.1Interrupt Vectors ....................................................................................................55
11.2Moving Interrupts Between Application and Boot Space ......................................60
11.3Register Description ..............................................................................................61
12.1Pin Change Interrupt Timing .................................................................................62
12.2Register Description ..............................................................................................64
(1)
.........................................................................................................39
8285B–AVR–03/11