4

7753BS–AVR–08/08

ATtiny261/461/861

2.

Overview

The ATtiny261/461/861 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced

RISC architecture. By executing powerful instructions in a single clock cycle, the

ATtiny261/461/861 achieves throughputs approaching 1 MIPS per MHz allowing the system

designer to optimize power consumption versus processing speed.

2.1

Block Diagram

Figure 2-1.

Block Diagram

PORT A (8)

PORT B (8)

USI

Timer/Counter1

Timer/Counter0

A/D Conv.

Internal

Bandgap

Analog Comp.

SRAM

Flash

EEPROM

Watchdog

Oscillator

Watchdog

Timer

Oscillator

Circuits /

Clock

Generation

Power

Supervision

POR / BOD &

RESET

PROGRAM

LOGIC

debugWIRE

AGND

AREF

AVCC

PA[0..7]

PB[0..7]

11

RESET

XTAL[1..2]

CPU

3