Overview
ATtiny20 is a low-power CMOS 8-bit microcontroller based on the compact AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATtiny20 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

FEATUREs
• High performance, low power 8-bit AVR® microcontroller
• Advanced RISC architecture
   • 112 powerful instructions – most single clock cycle execution
   • 16 x 8 general purpose working registers
   • Fully static operation
   • Up to 12 MIPS throughput at 12MHz
• Non-volatile program and data memories
   • 2K bytes of in-system programmable flash program memory
   • 128 bytes internal SRAM
   • Flash write/erase cycles: 10,000
   • Data retention: 20 years at 85oC / 100 years at 25oC
• Peripheral features
   • One 8-bit timer/counter with two PWM channels
   • One 16-bit timer/counter with two PWM channels
   • 10-bit analog to digital converter
      • 8 single-ended channels
   • Programmable watchdog timer with separate on-chip oscillator
   • On-chip analog comparator
   • Master/slave SPI serial interface
   • Slave TWI serial interface
• Special microcontroller features
   • In-system programmable
   • External and internal interrupt sources
   • Low power idle, ADC noise reduction, stand-by and power-down modes
   • Enhanced power-on reset circuit
   • Internal calibrated oscillator
• I/O and packages
   • 14-pin SOIC/TSSOP: 12 programmable I/O lines
   • 12-ball WLCSP: 10 programmable I/O lines
   • 15-ball UFBGA: 12 programmable I/O lines
   • 20-pad VQFN: 12 programmable I/O lines
• Operating voltage:
   • 1.8 – 5.5V
• Programming voltage:
   • 5V
• Speed grade
   • 0 – 4MHz @ 1.8 – 5.5V
   • 0 – 8MHz @ 2.7 – 5.5V
   • 0 – 12MHz @ 4.5 – 5.5V
• Industrial temperature range
• Low power consumption
   • Active mode:
     • 200 μA at 1MHz and 1.8V
   • Idle mode:
     • 25μA at 1MHz and 1.8V
   • Power-down mode:
     • < 0.1μA at 1.8V