ATmega32A Datasheet - Sunrom Technologies

ATmega32ATable of ContentsFeatures ..................................................................................................... 11 Pin Configurations ................................................................................... 22 Overview ................................................................................................... 32.1 Block Diagram ...................................................................................................32.2 Pin Descriptions .................................................................................................43 Resources ................................................................................................. 64 Data Retention .......................................................................................... 65 About Code Examples ............................................................................. 66 AVR CPU Core .......................................................................................... 76.1 Overview ............................................................................................................76.2 ALU – Arithmetic Logic Unit ...............................................................................86.3 Status Register ..................................................................................................86.4 General Purpose Register File ........................................................................106.5 Stack Pointer ...................................................................................................116.6 Instruction Execution Timing ...........................................................................126.7 Reset and Interrupt Handling ...........................................................................137 AVR Memories ........................................................................................ 167.1 Overview ..........................................................................................................167.2 In-System Reprogrammable Flash Program Memory .....................................167.3 SRAM Data Memory ........................................................................................177.4 EEPROM Data Memory ..................................................................................197.5 I/O Memory ......................................................................................................207.6 Register Description ........................................................................................208 System Clock and Clock Options ......................................................... 258.1 Clock Systems and their Distribution ...............................................................258.2 Clock Sources .................................................................................................268.3 Default Clock Source .......................................................................................268.4 Crystal Oscillator .............................................................................................278.5 Low-frequency Crystal Oscillator .....................................................................288.6 External RC Oscillator .....................................................................................298.7 Calibrated Internal RC Oscillator .....................................................................308.8 External Clock .................................................................................................308155C–AVR–02/11i