5

2586L–AVR–06/10

ATtiny25/45/85

registers to be accessed in one single instruction executed in one clock cycle. The resulting

architecture is more code efficient while achieving throughputs up to ten times faster than con-

ventional CISC microcontrollers.

The ATtiny25/45/85 provides the following features: 2/4/8K bytes of In-System Programmable

Flash, 128/256/512 bytes EEPROM, 128/256/256 bytes SRAM, 6 general purpose I/O lines, 32

general purpose working registers, one 8-bit Timer/Counter with compare modes, one 8-bit high

speed Timer/Counter, Universal Serial Interface, Internal and External Interrupts, a 4-channel,

10-bit ADC, a programmable Watchdog Timer with internal Oscillator, and three software select-

able power saving modes. Idle mode stops the CPU while allowing the SRAM, Timer/Counter,

ADC, Analog Comparator, and Interrupt system to continue functioning. Power-down mode

saves the register contents, disabling all chip functions until the next Interrupt or Hardware

Reset. ADC Noise Reduction mode stops the CPU and all I/O modules except ADC, to minimize

switching noise during ADC conversions.

The device is manufactured using Atmel’s high density non-volatile memory technology. The

On-chip ISP Flash allows the Program memory to be re-programmed In-System through an SPI

serial interface, by a conventional non-volatile memory programmer or by an On-chip boot code

running on the AVR core.

The ATtiny25/45/85 AVR is supported with a full suite of program and system development tools

including: C Compilers, Macro Assemblers, Program Debugger/Simulators and Evaluation kits.