AVR and The Minimum System

AVR is a microcontroller family which is now the most widely used. The concept of the AVR architecture was originally created by two students at Nerwegia Institute of Technology (NTH) that is Alf-Egil Bogen and Vegard Wallen which later developed by Atmel. Until now Atmel AVR family has issued few, the latter is a family of 32-bit RISC AVR. One family of AVR 8-bit microcontroller that is often used is ATMEGA8535/32.

That makes this microcontroller family of widely used people are :

1. Have a Flash, a EEPROM, and a SRAM are all in one IC, so that in certain applications do not require external memory. 
2. Program execution faster because nearly all instruction is conducted in only one or two clock cycles different with MCS-51, which performs instruction in 12 clock cycles. 
3. Has many useful features, for example on ATMEGA8535, look at features

Click on the pictures to zoom in

The Minimum System of AVR

The minimum system circuit is a minimal circuit  where a microcontroller chip can work (running). Circuit is called minimal because of the use of hardware components that are used are the most minimal requirements for a processor to work. Actually AVR ATmega chip is equipped with an internal oscillator, so, to save costs (cost), no need to use a crystal / resonator external to source clock the CPU. But for good performance or we apply to projects that require a different oscillator with internal oscillator chip so we must use an external oscillator.
List of Components:

Name	Value	Quantity
uC (AVR)	ATMega8535/32	1
crystal	12Mhz	1
capacitors	30pF	2
elco	10uF	1
resistors	470	2
led		1
voltage regulator	LM7805	1
pin header		see pictures

If you have a downloader (serial or parallel), connect to the MISO. MOSI, SCK, RESET on the microcontroller (J1 in minimum system). Then to flash the program into the AVR  can use the software ISP flash-programmer v.30a. (free download)

Posted in: AVR, MicroController, PCB Layout