Monday, December 17, 2012



The high-performance, low-power Atmel 8-bit AVR RISC-based microcontroller combines 8KB of programmable flash memory, 544B SRAM, 512B EEPROM, and an 8-channel 10-bit A/D converter. The device supports throughput of 16 MIPS at 16MHz and operates between 4.5-5.5 volts. By executing instructions in a single clock cycle, the device achieves throughputs approaching 1 MIPS per MHz, balancing power consumption and processing speed.

The AVR core combines a rich instruction set with 32 general purpose working registers. All 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 ATmega8535 provides the following features: 8K bytes of In-System Programmable Flash with Read-While-Write capabilities, 512 bytes EEPROM, 512 bytes SRAM, 32 general purpose I/O lines, 32general purpose working registers, 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 in TQFP package, 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 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 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.

Features :

  • High-performance, Low-power AVR® 8-bit Microcontroller
  • Advanced RISC Architecture
    – 130 Powerful Instructions – Most Single Clock Cycle Execution
    – 32 x 8 General Purpose Working Registers
    – Fully Static Operation
    – Up to 16 MIPS Throughput at 16 MHz
    – On-chip 2-cycle Multiplier
  • Nonvolatile Program and Data Memories
    – 8K Bytes of In-System Self-Programmable Flash
       Endurance: 10,000 Write/Erase Cycles
    – Optional Boot Code Section with Independent Lock Bits In-System Programming by On-chip Boot Program True Read-While-Write Operation
    – 512 Bytes EEPROM
       Endurance: 100,000 Write/Erase Cycles
    – 512 Bytes Internal SRAM
    – Programming Lock for Software Security
  • 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 for TQFP Package Only
    2 Differential Channels with Programmable Gain at 1x, 10x, or 200x for TQFP
    Package Only
    – Byte-oriented Two-wire Serial Interface
    – Programmable Serial USART
    – Master/Slave SPI Serial Interface
    – Programmable Watchdog Timer with Separate 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
  • I/O and Packages
    – 32 Programmable I/O Lines
    – 40-pin PDIP, 44-lead TQFP, 44-lead PLCC, and 44-pad QFN/MLF
  • Operating Voltages
    – 2.7 - 5.5V for ATmega8535L
    – 4.5 - 5.5V for ATmega8535
  • Speed Grades
    – 0 - 8 MHz for ATmega8535L
    – 0 - 16 MHz for ATmega8535

Pinout Diagram

Download Datasheet ATMEGA8535

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