The ATMEGA 1284P is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATMEGA1284P achieves through puts approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed. It is a 8-bit Microcontroller with 128K Bytes In-System Programmable Flash. 

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 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/two 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 1×, 10× or 200×

   ̶  Byte-oriented Two-wire Serial Interface

   ̶  Two 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, 44-pad VQFN/QFN/MLF 

   ̶  44-pad DRQFN – 49-ball VFBGA 

•  Operating Voltages 

    ̶  1.8 - 5.5V 

•  Speed Grades

     ̶  0 - 4MHz @ 1.8 - 5.5V 

     ̶  0 - 10MHz @ 2.7 - 5.5V 

     ̶  0 - 20MHz @ 4.5 - 5.5V 

•  Power Consumption at 1MHz, 1.8V, 25° C 

    ̶  Active: 0.4mA

    ̶  Power-down Mode: 0.1µA

    ̶  Power-save Mode: 0.6µA (Including 32kHz RTC) 

Related Document:-

 ATMEGA1284P-4U SMD Data Sheet