ATmega644PA Datasheet | Atmel

Features - High-performance, low-power 8-bit Atmel® AVR® Microcontroller - Advanced RISC architecture ̶ 131 powerful Instructions - most single-clock cycle execution ̶ 32 × 8 general purpose working registers ̶ Fully static operation ̶ Up to 20MIPS throughput at 20MHz ̶ On-chip 2-cycle multiplier - High endurance non-volatile memory segments ̶ 16/32/64/128KBytes of In-System Self-programmable Flash program memory ̶ 512/1K/2K/4KBytes EEPROM ̶ 1/2/4/16KBytes 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 - Atmel QTouch® library support ̶ Capacitive touch buttons, sliders and wheels ̶ QTouch and QMatrix acquisition ̶ Up to 64 sense channels - JTAG (IEEE std. 1149.1 pliant) 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 pare Modes ̶ One/two 16-bit Timer/Counter with Separate Prescaler, pare Mode, and Capture Mode ̶ Real Time Counter with Separate Oscillator ̶ Six PWM Channels ̶ 8-channel, 10-bit ADC - Differential mode with selectable gain at 1×, 10× or 200× ̶ Byte-oriented Two-wire Serial Interface ̶ Two Programmable Serial USART ̶ Master/Slave SPI Serial Interface Atmel-8272G-AVR-01/2015 ̶ Programmable Watchdog Timer with Separate On-chip Oscillator ̶ On-chip Analog parator ̶ 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...