ATMEGA48P_14 Datasheet, PDF (413/420 Pages) ATMEL Corporation – High Endurance Non-volatile Memory Segments

ATmega48P/88P/168P
Table of Contents
Features ..................................................................................................... 1
1 Pin Configurations ................................................................................... 2
1.1Pin Descriptions ........................................................................................................3
2 Overview ................................................................................................... 4
2.1Block Diagram ...........................................................................................................5
2.2Comparison Between ATmega48P, ATmega88P and ATmega168P .......................7
3 Resources ................................................................................................. 8
4 Data Retention .......................................................................................... 8
5 About Code Examples ............................................................................. 8
6 Capacitive touch sensing ........................................................................ 8
7 AVR CPU Core .......................................................................................... 9
7.1Overview ...................................................................................................................9
7.2ALU – Arithmetic Logic Unit ....................................................................................10
7.3Status Register ........................................................................................................10
7.4General Purpose Register File ................................................................................12
7.5Stack Pointer ...........................................................................................................13
7.6Instruction Execution Timing ...................................................................................14
7.7Reset and Interrupt Handling ..................................................................................15
8 AVR Memories ........................................................................................ 17
8.1Overview .................................................................................................................17
8.2In-System Reprogrammable Flash Program Memory .............................................17
8.3SRAM Data Memory ...............................................................................................19
8.4EEPROM Data Memory ..........................................................................................20
8.5I/O Memory ..............................................................................................................21
8.6Register Description ................................................................................................22
9 System Clock and Clock Options ......................................................... 27
9.1Clock Systems and their Distribution .......................................................................27
9.2Clock Sources .........................................................................................................28
9.3Low Power Crystal Oscillator ...................................................................................29
9.4Full Swing Crystal Oscillator ....................................................................................31
9.5Low Frequency Crystal Oscillator ............................................................................33
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8025M–AVR–6/11