ATMEGA645-16AI Atmel, ATMEGA645-16AI Datasheet - Page 355

• Manufacturer Part Number: ATMEGA645-16AI
• Description: IC AVR MCU FLASH 64K 5V 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA645-16AI

• 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: 53
• 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: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table of Contents
2570M–AVR–04/11
1
2
3
4
5
6
7
8
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 4
Resources ................................................................................................. 9
Data Retention .......................................................................................... 9
About Code Examples ............................................................................. 9
AVR CPU Core ........................................................................................ 10
AVR Memories ........................................................................................ 18
System Clock and Clock Options ......................................................... 26
2.1
2.2
2.3
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
7.1
7.2
7.3
7.4
7.5
8.1
8.2
8.3
8.4
8.5
8.6
Block Diagram ...................................................................................................4
Comparison between ATmega325, ATmega3250, ATmega645 and
ATmega6450 5
Pin Descriptions .................................................................................................6
Overview ..........................................................................................................10
Architectural Overview .....................................................................................10
ALU – Arithmetic Logic Unit .............................................................................11
Status Register ................................................................................................12
General Purpose Register File ........................................................................13
Stack Pointer ...................................................................................................14
Instruction Execution Timing ...........................................................................14
Reset and Interrupt Handling ...........................................................................15
In-System Reprogrammable Flash Program Memory .....................................18
SRAM Data Memory ........................................................................................19
EEPROM Data Memory ..................................................................................20
I/O Memory ......................................................................................................21
Register Description ........................................................................................22
Clock Systems and their Distribution ...............................................................26
Clock Sources .................................................................................................27
Crystal Oscillator .............................................................................................28
Low-frequency Crystal Oscillator .....................................................................29
Calibrated Internal RC Oscillator .....................................................................29
External Clock .................................................................................................30
ATmega325/3250/645/6450
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