ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 401

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Table of Contents
8011D–AVR–02/07
1
2
3
4
5
6
7
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 3
Resources ................................................................................................. 7
About Code Examples ............................................................................. 8
AVR CPU Core .......................................................................................... 9
AVR Memories ........................................................................................ 18
System Clock and Clock Options ......................................................... 29
2.1 Block Diagram ..........................................................................................................3
2.2 Comparison Between ATmega164P, ATmega324P and ATmega644P ..................4
2.3 Pin Descriptions .......................................................................................................4
5.1 Overview ..................................................................................................................9
5.2 ALU – Arithmetic Logic Unit ...................................................................................10
5.3 Status Register .......................................................................................................10
5.4 General Purpose Register File ...............................................................................12
5.5 Stack Pointer ..........................................................................................................13
5.6 Instruction Execution Timing ..................................................................................14
5.7 Reset and Interrupt Handling .................................................................................15
6.1 Overview ................................................................................................................18
6.2 In-System Reprogrammable Flash Program Memory ............................................18
6.3 SRAM Data Memory ..............................................................................................19
6.4 EEPROM Data Memory .........................................................................................21
6.5 I/O Memory .............................................................................................................22
6.6 Register Description ...............................................................................................23
7.1 Clock Systems and their Distribution ......................................................................29
7.2 Clock Sources ........................................................................................................30
7.3 Low Power Crystal Oscillator ..................................................................................32
7.4 Full Swing Crystal Oscillator ...................................................................................33
7.5 Low Frequency Crystal Oscillator ...........................................................................34
7.6 Calibrated Internal RC Oscillator ............................................................................36
7.7 128 kHz Internal Oscillator .....................................................................................37
7.8 External Clock ........................................................................................................37
ATmega164P/324P/644P
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