Overview
ATtiny1634 is a low-power CMOS 8-bit microcontrollers based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny1634 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

FEATUREs
• High Performance, Low Power AVR® 8-bit Microcontroller
• Advanced RISC Architecture
   – 125 Powerful Instructions – Most Single Clock Cycle Execution
   – 32 x 8 General Purpose Working Registers
   – Fully Static Operation
• High Endurance, Non-volatile Memory Segments
   – 16K Bytes of In-System, Self-Programmable Flash Program Memory
      • Endurance: 10,000 Write/Erase Cycles
   – 256 Bytes of In-System Programmable EEPROM
      • Endurance: 100,000 Write/Erase Cycles
   – 1K Byte of Internal SRAM
   – Data retention: 20 years at 85C / 100 years at 25C
   – Programming Lock for Self-Programming Flash & EEPROM Data Security
• Peripheral Features
   – Dedicated Hardware and QTouch® Library Support for Capacitive Touch Sensing
   – One 8-bit and One 16-bit Timer/Counter with Two PWM Channels, Each
   – 12-channel, 10-bit ADC
   – Programmable Ultra Low Power Watchdog Timer
   – On-chip Analog Comparator
   – Two Full Duplex USARTs with Start Frame Detection
   – Universal Serial Interface
   – Slave I2C Serial Interface
• Special Microcontroller Features
   – debugWIRE On-chip Debug System
   – In-System Programmable via SPI Port
   – Internal and External Interrupt Sources
      • Pin Change Interrupt on 18 Pins
   – Low Power Idle, ADC Noise Reduction, Standby and Power-down Modes
   – Enhanced Power-on Reset Circuit
   – Programmable Brown-out Detection Circuit with Supply Voltage Sampling
   – Calibrated 8MHz Oscillator with Temperature Calibration Option
   – Calibrated 32kHz Ultra Low Power Oscillator
   – On-chip Temperature Sensor
• I/O and Packages
   – 18 Programmable I/O Lines
   – 20-pad QFN/MLF, and 20-pin SOIC
• Operating Voltage:
   – 1.8 – 5.5V
• Speed Grade:
   – 0 – 2MHz @ 1.8 – 5.5V
   – 0 – 8MHz @ 2.7 – 5.5V
   – 0 – 12MHz @ 4.5 – 5.5V
• Temperature Range: -40C to +105C
• Low Power Consumption
   – Active Mode: 0.2mA at 1.8V and 1MHz
   – Idle Mode: 30µA at 1.8V and 1MHz
   – Power-Down Mode (WDT Enabled): 1µA at 1.8V
   – Power-Down Mode (WDT Disabled): 100nA at 1.8V