AVR Microcontroller System

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Introducing Microcontrollers About AVR

AVR Mega8 Architecture AVR Programming Interface Demo: Hello World AVR Design. Demo: Hardware Design Demo: Programming


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A microprocessor is a central processing unit(CPU) on a single chip.

When a microprocessor and associatedsupport circuitry, peripheral I/O componentsand memory (program as well as data) wereput together to form a small computerspecifically for data acquisition and controlapplications, it was called a microcomputer.


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When the components that make amicrocomputer were put together on a single

chip of silicon, it was called themicrocontroller.


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A microcontrollerinterfaces to

external deviceswith a minimum ofexternalcomponents


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A recent white paper by Sun Microsystems claims thatby the end of the decade, an average home willcontain between 50 to 100 microcontrollerscontrolling digital phones, microwave ovens, VCRs,televisions sets and television remotes, dishwashers,home security systems, PDAs etc.

An average car has about 15 processors; the 1999Mercedes S-class car has 63 microprocessors, while

the 1999 BMW has 65 processors! Except perhaps the human body, microprocessors andmicrocontrollers have gotten into everything aroundus.


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Enhanced RISC architecture with mostlyfixed-length instruction, load-store memory

access and 32 general-purpose registers. A two-stage instruction pipeline that speeds

up execution Majority of instructions take one clock cycle Up to 10-MHz clock operation


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Wide variety of on-chip peripherals, includingdigital I/O, ADC, EEPROM, Timer, UART, RTC

timer, PWM etc Internal program and data memory. In-System programmable (ISP) Available in 8-pin to 64-pin size to suit wide

variety of applications


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Up to 12 times performance speedup overconventional CISC controllers.

Wide operating voltage from 2.7V to 6.0V Simple architecture offers a small learning

curve to the uninitiated.


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8-Kbyte self-

programming Flash

Program Memory

1-Kbyte SRAM 512 Byte EEPROM

6 or 8 Channel 10-bit A/D-converter.

Up to 16 MIPSthroughput at 16 Mhz.

2.7 - 5.5 Volt operation.


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The purpose of this

demo is:

to design a simple AVR

system

Interface it to and LCDdisplay

Program it to display

Hello World

Programmer

AVR MCU

LCD Display


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LCD Interface AVR Port

RS PORTC.2

RW PORTC.3

E PORTC.4

DATA PORTD


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AVR Studio GCC

AVRLibs PonyProg


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Include the following files in your project

lcd.c

global.h timer.h

lcd.h


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Add a new c source file to your AVR Studioproject.

Type in the main function as shown below:


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Main() {

lcdInitHW(); lcdInit();

lcdGotoXY(0,4);

lcdPrintData(Hello Word!, 11);

}


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Documents

AVR Microcontroller System