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ATTINY261A

8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash

Atmel Corporation 

2. 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 opti-

mize power consumption versus processing speed.

2.1 Block Diagram

Figure 2-1. Block Diagram

Watchdog

Timer

Watchdog

Oscillator

Oscillator

Circuits /

Clock

Generation

EEPROM

Power

Supervision

POR / BOD &

RESET

Flash

debugWIRE

PROGRAM

LOGIC

SRAM

CPU

Timer/Counter0

Timer/Counter1

A/D Conv.

USI

Analog Comp.

Internal

Bandgap

AVCC

AGND

AREF

3

11

PORT B (8)

PORT A (8)

PB[0:7]

PA[0:7]

RESET

XTAL[1:2]

The AVR core combines a rich instruction set with 32 general purpose working registers. All 32

registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

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.

4 ATtiny261A/461A/861A

8197CS–AVR–05/11

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