ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 672

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

Table of Contents
8285D–AVR–06/11
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
1
2
3
4
5
6
7
8
9
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 4
Resources ................................................................................................. 9
Data Retention .......................................................................................... 9
About Code Examples ............................................................................. 9
Capacitive touch sensing ........................................................................ 9
AVR CPU Core ........................................................................................ 10
AVR Memories ........................................................................................ 18
System Clock and Clock Options ......................................................... 29
1.1Pinout - TQFP and QFN/MLF ....................................................................................2
1.2Pinout - 100A (TQFP) ................................................................................................3
2.1Block Diagram ...........................................................................................................4
2.2Comparison Between
2.3Pin Descriptions ........................................................................................................6
7.1Introduction ..............................................................................................................10
7.2Architectural Overview ............................................................................................10
7.3ALU – Arithmetic Logic Unit ....................................................................................11
7.4AVR Status Register ...............................................................................................11
7.5General Purpose Register File ................................................................................13
7.6Stack Pointer ...........................................................................................................14
7.7Instruction Execution Timing ...................................................................................15
7.8Reset and Interrupt Handling ..................................................................................16
8.1In-System Reprogrammable Flash Program Memory .............................................18
8.2SRAM Data Memory ...............................................................................................19
8.3EEPROM Data Memory ..........................................................................................21
8.4I/O Memory ..............................................................................................................25
8.5General Purpose I/O Registers ...............................................................................25
8.6Register Description ................................................................................................26
9.1Clock Systems and their Distribution .......................................................................29
9.2Clock Sources .........................................................................................................30
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P 6
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