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Overview

The ATmega325/3250/645/6450 provides the following features: 32/64K bytes of In-System Programmable Flash with Read-While-Write capabilities, 1/2K bytes EEPROM, 2/4K byte SRAM, 54/69 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, Universal Serial Interface with Start Condition Detector, an 8-channel, 10-bit ADC, a programmable Watchdog Timer with internal Oscillator, an SPI serial port, and five software selectable power saving modes.

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

? High Endurance Non-volatile Memory Segments

– In-System Self-programmable Flash Program Memory

? 32K Bytes (ATmega325/ATmega3250)

? 64K Bytes (ATmega645/ATmega6450)

– EEPROM

? 1K bytes (ATmega325/ATmega3250)

? 2K bytes (ATmega645/ATmega6450)

– Internal SRAM

? 2K bytes (ATmega325/ATmega3250)

? 4K bytes (ATmega645/ATmega6450)

– 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

? Peripheral Features

– Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode

– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode

– Real Time Counter withSeparate Oscillator

–Four PWM Channels

– 8-channel, 10-bit ADC

– Programmable Serial USART

– Master/Slave SPI Serial Interface

– Universal Serial Interface with Start Condition Detector

– Programmable Watchdog Timer with Separate On-chip Oscillator

– On-chip Analog Comparator

– Interrupt and Wake-up on Pin Change

? Special Microcontroller Features

– Power-on Reset and Programmable Brown-out Detection

– Internal Calibrated Oscillator

– External and Internal Interrupt Sources

– Five Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, and Standby

? I/O and Packages

– 53/68 Programmable I/O Lines

– 64-lead TQFP, 64-pad QFN/MLF, and 100-lead TQFP

? Speed Grade:

– ATmega325V/ATmega3250V/ATmega645V/ATmega6450V:

? 0 - 4 MHz @ 1.8 - 5.5V, 0 - 8 MHz @ 2.7 - 5.5V

– ATmega325/3250/645/6450:

? 0 - 8 MHz @ 2.7 - 5.5V, 0 - 16 MHz @ 4.5 - 5.5V

? Temperature range:

– -40°C to 85°C Industrial

? Ultra-Low Power Consumption

– Active Mode:

1 MHz, 1.8V: 350 μA

32 kHz, 1.8V: 20 μA (including Oscillator)

– Power-down Mode: 100 nA at 1.8V