Document Outline

• Features
• Pin Configurations
• Description
  • Block Diagram
  • Pin Descriptions
    • VCC
    • GND
    • Port A (PA3..PA0)
    • Port B (PB7..PB0)
    • Port D (PD7..PD0)
    • XTAL1
    • XTAL2
    • RESET
  • Clock Options
    • Internal RC Oscillator
    • Crystal Oscillator
    • External Clock
    • External RC Oscillator
• Architectural Overview
  • General-purpose Register File
  • ALU – Arithmetic Logic Unit
  • Downloadable Flash Program Memory
  • Program and Data Addressing Modes
    • Register Direct, Single Register Rd
    • Register Indirect
    • Register Direct, Two Registers Rd and Rr
    • I/O Direct
    • Relative Program Addressing, RJMP and RCALL
    • Constant Addressing Using the LPM Instruction
  • Subroutine and Interrupt Hardware Stack
  • Memory Access and Instruction Execution Timing
  • I/O Memory
    • Status Register – SREG
  • Reset and Interrupt Handling
    • Reset Sources
    • Power-on Reset
    • External Reset
    • Watchdog Reset
    • MCU Control and Status Register – MCUCS
    • Interrupt Handling
    • Interrupt Response Time
    • Interrupt Control Register – ICR
    • Interrupt Flag Register – IFR
    • External Interrupt
    • Low-level Input Interrupt
  • Sleep Modes
    • Idle Mode
    • Power-down Mode
• Timer/Counter0
  • Timer/Counter Prescaler
    • Timer/Counter0 Control Register – TCCR0
    • Timer Counter 0 – TCNT0
• Watchdog Timer
  • Watchdog Timer Control Register – WDTCR
• Calibrated Internal RC Oscillator
  • Oscillator Calibration Register – OSCCAL
• Hardware Modulator
  • Modulation Control Register – MODCR
• Analog Comparator
  • Analog Comparator Control and Status Register – ACSR
• I/O Ports
  • Port A
    • Port A Data Register – PORTA
    • Port A Control Register – PACR
    • Port A as General Digital I/O
    • Port A Input Pins Address – PINA
    • Alternate Function of PA2
    • Port A Schematics
  • Port B
    • Port B Input Pins Address – PINB
    • Port B as General Digital Input
    • Alternate Functions of Port B
    • Port B Schematics
  • Port D
    • Port D Data Register – PORTD
    • Port D Data Direction Register – DDRD
    • Port D Input Pins Address – PIND
    • Port D as General Digital I/O
• Memory Programming
  • Program Memory Lock Bits
  • Fuse Bits
  • Signature Bytes
  • Calibration Byte
  • Programming the Flash
  • Parallel Programming
    • Signal Names
    • Enter Programming Mode
    • Chip Erase
    • Programming the Flash
    • Reading the Flash
    • Programming the Fuse Bits
    • Programming the Lock Bits
    • Reading the Fuse and Lock Bits
    • Reading the Signature Bytes and Calibration Byte
• Parallel Programming Characteristics
• Electrical Characteristics
  • Absolute Maximum Ratings
  • DC Characteristics
  • External Clock Drive Waveforms
  • External Clock Drive
• Typical Characteristics
• Register Summary
• Instruction Set Summary
• Ordering Information
• Packaging Information
  • 32A
  • 28P3
  • 32M1-A