Description
The ATmega603/103 is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega603/103 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

FEATUREs
• Utilizes the AVR® RISC Architecture
• AVR - High-performance and Low-power RISC Architecture
    – 120/121 Powerful Instructions - Most Single Clock Cycle Execution
    – 32 x 8 General Purpose Working Registers + Peripheral Control Registers
    – Up to 6 MIPS Throughput at 6 MHz
• Data and Nonvolatile Program Memory
    – 64K/128K Bytes of In-System Programmable Flash Endurance: 1,000 Write/Erase Cycles
    – 4K Bytes Internal SRAM
    – 2K/4K Bytes of In-System Programmable EEPROM Endurance: 100,000 Write/Erase Cycles
    – Programming Lock for Flash Program and EEPROM Data Security
    – SPI Interface for In-System Programming
• Peripheral Features
    – On-chip Analog Comparator
    – Programmable Watchdog Timer with On-chip Oscillator
    – Programmable Serial UART
    – Master/Slave SPI Serial Interface
    – Real Time Counter (RTC) with Separate Oscillator
    – Two 8-bit Timer/Counters with Separate Prescaler and PWM
    – Expanded 16-bit Timer/Counter system, with Separate Prescaler, Compare, Capture Modes and Dual 8-, 9-, or 10-bit PWM
    – Programmable Watchdog Timer with On-chip Oscillator
    – 8-channel, 10-bit ADC
• Special Microcontroller Features
    – Low-power Idle, Power Save and Power Down Modes
    – Software Selectable Clock Frequency
    – External and Internal Interrupt Sources
• Specifications
    – Low-power, High-speed CMOS Process Technology
    – Fully Static Operation
• Power Consumption at 4 MHz, 3V, 25°C
    – Active: 5.5 mA
    – Idle Mode: 1.6 mA
    – Power Down Mode: < 1 µA
• I/O and Packages
    – 32 Programmable I/O Lines, 8 Output Lines, 8 Input Lines
    – 64-pin TQFP
• Operating Voltages
    – 2.7 - 3.6V (ATmega603L and ATmega103L)
    – 4.0 - 5.5V (ATmega603 and ATmega103)
• Speed Grades
    – 0 - 4 MHz (ATmega603L and ATmega103L)
    – 0 - 6 MHz (ATmega603 and ATmega103)