ATMega chip full datasheet - UCSD Department of Physics

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ATmega48A/PA/88A/PA/168A/PA/328/P36.4 Rev. 8271A – 12/091. New <strong>datasheet</strong> 8271 with merged information for ATmega48PA, ATmega88PA,ATmega168PA and ATmega48A, ATmega88A andATmega168A. Also includedinformation on ATmega328 and ATmega328P2 Changes done:– New devices added: ATmega48A/ATmega88A/ATmega168A andATmega328– Updated Feature Description– Updated Table 2-1 on page 6– Added note for BOD Disable on page 41.– Added note on BOD and BODSE in ”MCUCR – MCU Control Register” onpage 94 and ”Register Description” on page 295– Added limitation informatin for the application ”Boot Loader Support –Read-While-Write Self-Programming” on page 280– Added limitiation information for ”Program And Data Memory Lock Bits” onpage 297– Added specified DC characteristics– Added typical characteristics– Removed exception information in ”Address Match Unit” on page 224.8271D–AVR–05/11558
ATmega48A/PA/88A/PA/168A/PA/328/PTable <strong>of</strong> ContentsFeatures ..................................................................................................... 11 Pin Configurations ................................................................................... 21.1Pin Descriptions ........................................................................................................32 Overview ................................................................................................... 52.1Block Diagram ...........................................................................................................52.2Comparison Between Processors .............................................................................63 Resources ................................................................................................. 84 Data Retention .......................................................................................... 85 About Code Examples ............................................................................. 86 Capacitive Touch Sensing ...................................................................... 87 AVR CPU Core .......................................................................................... 97.1Overview ...................................................................................................................97.2ALU – Arithmetic Logic Unit ....................................................................................107.3Status Register ........................................................................................................107.4General Purpose Register File ................................................................................127.5Stack Pointer ...........................................................................................................137.6Instruction Execution Timing ...................................................................................147.7Reset and Interrupt Handling ..................................................................................158 AVR Memories ........................................................................................ 178.1Overview .................................................................................................................178.2In-System Reprogrammable Flash Program Memory .............................................178.3SRAM Data Memory ...............................................................................................198.4EEPROM Data Memory ..........................................................................................208.5I/O Memory ..............................................................................................................218.6Register Description ................................................................................................229 System Clock and Clock Options ......................................................... 279.1Clock Systems and their Distribution .......................................................................279.2Clock Sources .........................................................................................................289.3Low Power Crystal Oscillator ...................................................................................299.4Full Swing Crystal Oscillator ....................................................................................319.5Low Frequency Crystal Oscillator ............................................................................338271D–AVR–05/11i
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Page 567: Atmel Corporation2325 Orchard Parkw
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ATMega chip full datasheet - UCSD Department of Physics

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