ATMEGA644-20AU 8-bit ATmega AVR® microcontroller, 64 KB, 20 MHz, TQFP-44

Microcontroller with 64K Bytes In-System Programmable Flash ATmega644/V

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 20 MIPS Throughput at 20MHz - High Endurance Non-volatile Memory segments - 64 Kbytes of In-System Self-programmable Flash program memory - 2 Kbytes EEPROM - 4 Kbytes Internal SRAM - Write/Erase cyles: 10,000 Flash/100,000 EEPROM(1)(3) - Data retention: 20 years at 85°C/100 years at 25°C(2)(3) - 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 Prescalers and Compare Modes - One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode - Real Time Counter with Separate Oscillator - Six PWM Channels - 8-channel, 10-bit ADC Differential mode with selectable gain at 1x, 10x or 200x - Byte-oriented Two-wire Serial Interface - One Programmable Serial USART - Master/Slave SPI Serial Interface - 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 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, and 44-pad QFN/MLF - Speed Grades - ATmega644V: 0 - 4MHz @ 1.8V - 5.5V, 0 - 10MHz @ 2.7V - 5.5V - ATmega644: 0 - 10MHz @ 2.7V - 5.5V, 0 - 20MHz @ 4.5V - 5.5V - Power Consumption at 1MHz, 3V, 25·C - Active: 240µA @ 1.8V, 1MHz - Power-down Mode: 0.1µA @ 1.8V