ATMEGA644PV-20AU Atmel, ATMEGA644PV-20AU Datasheet - Page 431
![IC MCU AVR 64K FLASH 44-TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644PV-20AU
Manufacturer Part Number
ATMEGA644PV-20AU
Description
IC MCU AVR 64K FLASH 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PV-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)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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Table of Contents
8011O–AVR–07/10
1
2
3
4
5
6
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 4
About ......................................................................................................... 8
AVR CPU Core .......................................................................................... 9
AVR Memories ........................................................................................ 18
System Clock and Clock Options ......................................................... 29
1.1 Pinout - PDIP/TQFP/VQFN/QFN/MLF .....................................................................2
1.2 Pinout - DRQFN .......................................................................................................3
2.1 Block Diagram ..........................................................................................................4
2.2 Comparison Between ATmega164P, ATmega324P and ATmega644P ..................5
2.3 Pin Descriptions .......................................................................................................6
3.1 Resources ................................................................................................................8
3.2 About Code Examples ..............................................................................................8
3.3 Data Retention .........................................................................................................8
4.1 Overview ..................................................................................................................9
4.2 ALU – Arithmetic Logic Unit ...................................................................................10
4.3 Status Register .......................................................................................................10
4.4 General Purpose Register File ...............................................................................12
4.5 Stack Pointer ..........................................................................................................13
4.6 Instruction Execution Timing ..................................................................................14
4.7 Reset and Interrupt Handling .................................................................................15
5.1 Overview ................................................................................................................18
5.2 In-System Reprogrammable Flash Program Memory ............................................18
5.3 SRAM Data Memory ..............................................................................................19
5.4 EEPROM Data Memory .........................................................................................21
5.5 I/O Memory .............................................................................................................22
5.6 Register Description ...............................................................................................23
6.1 Clock Systems and their Distribution ......................................................................29
6.2 Clock Sources ........................................................................................................30
6.3 Low Power Crystal Oscillator ..................................................................................32
6.4 Full Swing Crystal Oscillator ...................................................................................33
ATmega164P/324P/644P
i
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