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ATTINY28V

8-bit AVR® Microcontroller with 2K Bytes of Flash

Atmel Corporation 

Description

Block Diagram

The ATtiny28 is a low-power CMOS 8-bit microcontroller based on the AVR RISC archi-

tecture. By executing powerful instructions in a single clock cycle, the ATtiny28 achieves

throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize

power consumption versus processing speed. The AVR core combines a rich instruction

set with 32 general-purpose working registers. All the 32 registers are directly con-

nected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be

accessed in one single instruction executed in one clock cycle. The resulting architec-

ture is more code efficient while achieving throughputs up to ten times faster than

conventional CISC microcontrollers.

Figure 1. The ATtiny28 Block Diagram

VCC

GND

PROGRAM

COUNTER

PROGRAM

FLASH

INSTRUCTION

REGISTER

INSTRUCTION

DECODER

XTAL1

XTAL2

8-BIT DATA BUS

INTERNAL

OSCILLATOR

OSCILLATOR

INTERNAL

CALIBRATED

OSCILLATOR

STACK

POINTER

WATCHDOG

TIMER

TIMING AND

CONTROL

HARDWARE

STACK

GENERAL

PURPOSE

REGISTERS

Z

MCU CONTROL

REGISTER

TIMER/

COUNTER

INTERRUPT

UNIT

CONTROL

LINES

PROGRAMMING

LOGIC

ALU

STATUS

REGISTER

HARDWARE

MODULATOR

RESET

DATA REGISTER

PORTB

PORTB

DATA REGISTER

PORTD

DATA DIR

REG. PORTD

DATA REGISTER PORTA CONTROL

PORTA

REGISTER

PORTD

PORTA

The ATtiny28 provides the following features: 2K bytes of Flash, 11 general-purpose I/O

lines, 8 input lines, a high-current LED driver, 32 general-purpose working registers, an

8-bit timer/counter, internal and external interrupts, programmable Watchdog Timer with

internal oscillator and 2 software-selectable power-saving modes. The Idle Mode stops

the CPU while allowing the timer/counter and interrupt system to continue functioning.

The Power-down mode saves the register contents but freezes the oscillator, disabling

all other chip functions until the next interrupt or hardware reset. The wake-up or inter-

2 ATtiny28L/V

1062FS–AVR–07/06

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