4

8246AS–AVR–11/09

ATtiny2313A/4313

2. Overview

The ATtiny2313A/4313 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

ATtiny2313A/4313 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

PROGRAM

COUNTER

PROGRAM

FLASH

INSTRUCTION

REGISTER

GND

VCC

INSTRUCTION

DECODER

CONTROL

LINES

STACK

POINTER

SRAM

GENERAL

PURPOSE

REGISTER

ALU

STATUS

REGISTER

PROGRAMMING

LOGIC

SPI

8-BIT DATA BUS

XTAL1

XTAL2

RESET

INTERNAL

OSCILLATOR

OSCILLATOR

WATCHDOG

TIMER

TIMING AND

CONTROL

MCU CONTROL

REGISTER

MCU STATUS

REGISTER

TIMER/

COUNTERS

INTERRUPT

UNIT

EEPROM

USI

USART

DATA REGISTER

PORTB

DATA DIR.

REG. PORTB

DATA REGISTER

PORTA

DATA DIR.

REG. PORTA

PORTB DRIVERS

PB0 - PB7

PORTA DRIVERS

PA0 - PA2

DATA REGISTER

PORTD

DATA DIR.

REG. PORTD

PORTD DRIVERS

PD0 - PD6

ON-CHIP

DEBUGGER

INTERNAL

CALIBRATED

OSCILLATOR