The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.
The ATmega32A provides the following features: 32Kbytes of In-System Programmable Flash Program memory with Read-While-Write capabilities, 1024bytes EEPROM, 2048bytes SRAM, 32 general purpose I/O lines, 32 general purpose working registers, a JTAG interface for Boundary-scan, On-chip Debugging support and programming, three flexible Timer/Counters with compare modes, Internal and External Interrupts, a serial programmable USART, a byte oriented Two-wire Serial Interface, an 8-channel, 10-bit ADC with optional differential input stage with programmable gain (TQFP package only), a programmable Watchdog Timer with Internal Oscillator, an SPI serial port, and six software selectable power saving modes. The Idle mode stops the CPU while allowing the USART, Two-wire interface, A/D Converter, SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning.
The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next External Interrupt or Hardware Reset. In Power-save mode, the Asynchronous Timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except Asynchronous Timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low-power consumption. In Extended Standby mode, both the main Oscillator and the Asynchronous Timer continue to run.

Key Features

• High-performance, Low-power Atmel AVR 8-bit Microcontroller
• Advanced RISC Architecture
  • 131 Powerful Instructions - Most Single-clock Cycle Execution
  • 32 × 8 General Purpose Working Registers
  • Fully Static Operation
  • Up to 16MIPS Throughput at 16MHz
  • On-chip 2-cycle Multiplier
• High Endurance Non-volatile Memory segments
  • 32Kbytes of In-System Self-programmable Flash program memory
  • 1024Bytes EEPROM
  • 2Kbytes Internal SRAM
  • Write/Erase cycles: 10,000 Flash/100,000 EEPROM
  • Data retention: 20 years at 85°C/100 years at 25°C(1)
  • Optional Boot Code Section with Independent Lock Bits
• In-System Programming by On-chip Boot Program
• True Read-While-Write Operation
  • Programming Lock for Software Security
• JTAG (IEEE std. 1149.1 Compliant) Interface
  • Boundary-scan Capabilities According to the JTAG Standard
  • Extensive On-chip Debug Support
  • Programming of Flash, EEPROM, Fuses and Lock Bits through the JTAG Interface
• Atmel QTouch® library support
  • Capacitive touch buttons, sliders and wheels
  • Atmel QTouch and QMatrix acquisition
  • Up to 64 sense channels
• Peripheral Features
  • Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes
  • One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode
  • Real Time Counter with Separate Oscillator
  • Four PWM Channels
  • 8-channel, 10-bit ADC
• 8 Single-ended Channels
• 7 Differential Channels in TQFP Package Only
• 2 Differential Channels with Programmable Gain at 1x, 10x, or 200x
  • Byte-oriented Two-wire Serial Interface
  • Programmable Serial USART
  • Master/Slave SPI Serial Interface
  • Programmable Watchdog Timer with On-chip Oscillator
  • On-chip Analog Comparator
• Special Microcontroller Features
  • Power-on Reset and Programmable Brown-out Detection
  • Internal Calibrated RC Oscillator
  • External and Internal Interrupt Sources
  • Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby.