ATMEGA8A 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA8A

8-bit Atmel Microcontroller with 8KB In-System Programmable Flash

Atmel Corporation 

2. Overview

The Atmel®AVR® ATmega8A is a low-power CMOS 8-bit microcontroller based on the AVR RISC architecture. By

executing powerful instructions in a single clock cycle, the ATmega8A 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

RESET

VCC

PC0 - PC6

PB0 - PB7

XTAL1

XTAL2

PORTC DRIVERS/BUFFERS

PORTB DRIVERS/BUFFERS

GND

PORTC DIGITAL INTERFACE

PORTB DIGITAL INTERFACE

AGND

AREF

MUX &

ADC

ADC

INTERFACE

PROGRAM

COUNTER

STACK

POINTER

PROGRAM

FLASH

SRAM

INSTRUCTION

REGISTER

INSTRUCTION

DECODER

CONTROL

LINES

AVR CPU

GENERAL

PURPOSE

REGISTERS

X

Y

Z

ALU

STATUS

REGISTER

PROGRAMMING

LOGIC

SPI

+

COMP.

-

INTERFACE

TWI

TIMERS/

COUNTERS

OSCILLATOR

INTERNAL

OSCILLATOR

WATCHDOG

TIMER

OSCILLATOR

MCU CTRL.

& TIMING

INTERRUPT

UNIT

EEPROM

USART

PORTD DIGITAL INTERFACE

PORTD DRIVERS/BUFFERS

PD0 - PD7

ATmega8A [DATASHEET]

3

8159ES–AVR–02/2013

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