Overview ATtiny261A/461A/861A are low-power CMOS 8-bit microcontrollers based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the devices achieve 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 – 123 Powerful Instructions – Most Single Clock Cycle Execution – 32 x 8 General Purpose Working Registers – Fully Static Operation – Up to 20 MIPS Throughput at 20 MHz • High Endurance Non-volatile Memory Segments – 2/4/8K Bytes of In-System Self-Programmable Flash Program Memory • Endurance: 10,000 Write/Erase Cycles – 128/256/512 Bytes of In-System Programmable EEPROM • Endurance: 100,000 Write/Erase Cycles – 128/256/512 Bytes of Internal SRAM – Data retention: 20 Years at 85°C / 100 Years at 25°C – In-System Programmable via SPI Port – Programming Lock for Software Security • Peripheral Features – One 8/16-bit Timer/Counter with Prescaler – One 8/10-bit High Speed Timer/Counter with Prescaler • 3 High Frequency PWM Outputs with Separate Output Compare Registers • Programmable Dead Time Generator – 10-bit ADC • 11 Single-Ended Channels • 16 Differential ADC Channel Pairs • 15 Differential ADC Channel Pairs with Programmable Gain (1x, 8x, 20x, 32x) – On-Chip Analog Comparator – Programmable Watchdog Timer with Separate On-Chip Oscillator – Universal Serial Interface with Start Condition Detector – Interrupt and Wake-up on Pin Change • Special Microcontroller Features – debugWIRE On-Chip Debug System – Power-on Reset and Programmable Brown-out Detection – Internal Calibrated Oscillator – External and Internal Interrupt Sources – Four Sleep Modes: Low Power Idle, ADC Noise Reduction, Standby and Power Down – On-Chip Temperature Sensor • I/O and Packages – 16 Programmable I/O Lines – 20-pin PDIP, 20-pin SOIC, 20-pin TSSOP and 32-pad MLF • Operating Voltage – 1.8 – 5.5V • Speed Grades – 0 – 4 MHz @ 1.8 – 5.5V – 0 – 10 MHz @ 2.7 – 5.5V – 0 – 20 MHz @ 4.5 – 5.5V • Power Consumption at 1 MHz, 1.8V, 25°C – Active: 200 µA – Power-Down Mode: 0.1 µA