Atmel ATtiny85

Features
• High Performance, Low Power AVR
®
8-Bit Microcontroller
• Advanced RISC Architecture
– 120 Powerful Instructions – Most Single Clock Cycle Execution
– 32 x 8 General Purpose Working Registers
– Fully Static Operation
• Non-volatile Program and Data Memories
– 2/4/8K Byte of In-System Programmable Program Memory Flash (ATtiny25/45/85)
• Endurance: 10,000 Write/Erase Cycles
– 128/256/512 Bytes In-System Programmable EEPROM (ATtiny25/45/85)
• Endurance: 100,000 Write/Erase Cycles
– 128/256/512 Bytes Internal SRAM (ATtiny25/45/85)
– Programming Lock for Self-Programming Flash Program and EEPROM Data
Security
• Peripheral Features
– 8-bit Timer/Counter with Prescaler and Two PWM Channels
– 8-bit High Speed Timer/Counter with Separate Prescaler
• 2 High Frequency PWM Outputs with Separate Output Compare Registers
• Programmable Dead Time Generator
– Universal Serial Interface with Start Condition Detector
– 10-bit ADC
• 4 Single Ended Channels
• 2 Differential ADC Channel Pairs with Programmable Gain (1x, 20x)
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
• Special Microcontroller Features
– debugWIRE On-chip Debug System
– In-System Programmable via SPI Port
– External and Internal Interrupt Sources
– Low Power Idle, ADC Noise Reduction, and Power-down Modes
– Enhanced Power-on Reset Circuit
– Programmable Brown-out Detection Circuit
– Internal Calibrated Oscillator
• I/O and Packages
– Six Programmable I/O Lines
– 8-pin SOIC
– 20-pin QFN
• Operating Voltage
– 2.7 - 5.5V for ATtiny25/45/85
• Speed Grade
– ATtiny25/45/85: 0 - 8 MHz @ 2.7 - 5.5V, 0 - 16 MHz @ 4.5 - 5.5V
• Automotive Temperature Range
– -40°C to +125°C
• Low Power Consumption
– Active Mode:
• 1 MHz, 2.7V: 300µA
– Power-down Mode:
• 0.2µA at 2.7V
8-bit
Microcontroller
with 2/4/8K
Bytes In-System
Programmable
Flash
ATtiny25
ATtiny45
ATtiny85
Automotive
7598H–AVR–07/09

Atmel ATtiny85 Specifications

General

Architecture	8-bit AVR
Flash Memory	8 KB
SRAM	512 B
EEPROM	512 B
Clock Speed	20 MHz
GPIO Pins	6
ADC Channels	4
ADC Resolution	10-bit
Timers	2 (8-bit)
PWM Channels	2
Operating Voltage	2.7V - 5.5V
Communication Interfaces	SPI, I2C
Package	DIP-8, SOIC-8
Operating Temperature	-40°C to 85°C

Summary

ATtiny254585 Features Overview

High-Performance AVR Microcontroller

Details on the advanced RISC architecture and its benefits for performance.

Non-volatile Program and Data Memories

Information on Flash, EEPROM, and SRAM capacities and endurance.

Peripheral Features

Overview of integrated peripherals like Timers, ADC, and USI.

Low Power Consumption

ATtiny254585 Pin Configuration

ATtiny254585 Block Diagram

ATtiny254585 Pin Descriptions

AVR CPU Core

Architectural Overview

Explanation of the Harvard architecture and pipelining.

General Purpose Register File

Reset and Interrupt Handling

Explanation of reset sources and interrupt vector handling.

AVR ATtiny254585 Memories

In-System Re-programmable Flash Program Memory

Details on Flash memory size, endurance, and programming.

SRAM Data Memory Organization

Description of SRAM organization and addressing modes.

EEPROM Data Memory

Information on EEPROM capacity, endurance, and access.

System Clock and Clock Options

Clock Sources

System Clock Prescaler

Explanation of the Clock Prescale Register (CLKPR) for clock frequency control.

Power Management and Sleep Modes

MCU Control Register (MCUCR)

Power-down Mode Operation

Minimizing Power Consumption

Strategies for reducing power consumption in the device.

System Control and Reset

Reset Sources

Overview of the four reset sources: Power-on, External, Watchdog, Brown-out.

Power-on Reset (POR)

Details on the POR circuit, detection level, and start-up timing.

External Reset

Brown-out Detection (BOD)

Information on the on-chip BOD circuit and selectable trigger levels.

Watchdog Timer

Details on the Watchdog Timer operation, configuration, and reset.

Interrupts

Interrupt Vectors in ATtiny254585

IO Ports

Ports as General Digital IO

External Interrupts

8-bit TimerCounter0 with PWM

Overview of TimerCounter0

Modes of Operation

Explanation of Normal, CTC, Fast PWM, and Phase Correct PWM modes.

8-bit TimerCounter Register Description

Counter and Compare Units

TimerCounter1 Overview

TimerCounter1 in PWM Mode

Details on generating PWM waveforms with Timer/Counter1.

Universal Serial Interface (USI)

Overview of USI

Two-wire Mode Operation

Analog Comparator

Analog Comparator Control and Status Register (ACSR)

Analog to Digital Converter (ADC)

ADC Features

Overview of ADC resolution, conversion time, and input channels.

ADC Operation

Explanation of the ADC conversion process and voltage references.

Starting a Conversion

Methods for initiating ADC conversions, including auto-triggering.

ADC Conversion Result

Details on how the conversion result is presented and interpreted.

ADC Multiplexer Selection Register (ADMUX)

ADC Control and Status Register A (ADCSRA)

debugWIRE On-chip Debug System

debugWIRE Features

Self-Programming the Flash

Performing Page Erase by SPM

Filling the Temporary Buffer (Page Loading)

Memory Programming

Fuse Bytes Overview

Serial Downloading

High-voltage Serial Programming

Procedures for programming Flash, EEPROM, Lock bits, and Fuses.

Electrical Characteristics

Absolute Maximum Ratings

DC Characteristics

Typical Characteristics