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JX-Mega128 : ATmega128 Microcontroller Project board

1. Features

AVR Microcontroller ATMega128 in Palm size.

Running speed 16MHz

Built-in USB serial converter for Upload and Serial communication

On board 10 pin standard In-System Programming Connector

On board +5V. Low dropout voltage regulator with DC. input terminal Power source

selectable between USB Bus powered or On board power supply.

Both pin name and Wirings port numbering indicate on connection pads

Operationg voltage 5 V.

Download via Bootloader (STK500V2 Compatible and Wiring software ready).

16x2 LCD module on-top.

51 I/O ports free connection for interface the real-world application. Only PortA are

shared with LCD module connection.

Support all standard AVR Tools e.g.

[Open Source]

C Language - AVR Studio + WinAVR (Win32 only)

C/C++ Eclipse + AVR Plugins + AVR LibC (for Linux and MacOS X), (WINAVR for Win32)

Wiring software (Win32, MacOS X and Linux)

[Commercial]

BASIC / C / Pascal - MikroElektronika

ImageCraft C compiler

etc..

The INEXs JX-Mega128 microcontroller board is re-designed from the original Wiring Board

by Hernando Barragan, (see Wiring Project on http://www.wiring.org.co).

JX-Mega128

ATmega128 Microcontrollet board - Compatible with Wiring Project

Get more power of controls.



JX-Mega128 : ATmega128 Microcontroller Project board

2. Whats Wiring ?

Wiring is an open source programming environment and electronics i/o board for exploring

the electronic arts, tangible media, teaching and learning computer programming and prototyping

with electronics. It illustrates the concept of programming with electronics and the physical

realm of hardware control which are necessary to explore physical interaction design and tangible

media aspects.

Wiring is an open project initiated by Hernando Barrag?n (Universidad de Los Andes |

Architecture and Design School). Wiring started at the Interaction Design Institute Ivrea in

Italy and it is currently developed at the Universidad de Los Andes in Colombia.

Wiring builds on Processing, an open project initiated by Ben Fry (Broad Institute) and

Casey Reas (UCLA Design | Media Arts). Processing evolved from ideas explored in the Aesthetics

and Computation Group at the MIT Media Lab.

(All introduction messages are from the Wiring official webssite ; www.wiring.org.co)

The operation system that supported is :

Mac OS X 10.4 (Both Intel and PowerPC CPU)

Windows XP and Vista

Fedora Core 6 (Linux)

3. Introdcution to ATmega128 :

the main microcontroller of JX-Mega128 board

and Wiring project

The ATmega128 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 ATmega128

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

power consumption versus processing speed. Summary features of ATmega128 is :

High-performance, Low-power AVR® 8-bit Microcontroller

Advanced RISC Architecture

32 x 8 General Purpose Working Registers + Peripheral Control Registers

Up to 16 MIPS Throughput at 16 MHz

On-chip 2-cycle Multiplier

High Endurance Non-volatile Memory segments

- 128K Bytes of In-System Self-programmable Flash program memory

- 4K Bytes EEPROM/ 4K Bytes Internal SRAM

- Write/Erase cycles: 10,000 Flash/100,000 EEPROM

- Data retention: 20 years at 85°C/100 years at 25°

JX-Mega128 : ATmega128 Microcontroller Project board

Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

Up to 64K Bytes Optional External Memory Space

Programming Lock for Software Security

SPI Interface for In-System Programming

JTAG (IEEE std. 1149.1 Compliant) Interface

Peripheral Features

 Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes

 Two Expanded 16-bit Timer/Counters with Separate Prescaler, Compare

Mode and Capture Mode

 Real Time Counter with Separate Oscillator

 Two 8-bit PWM Channels

 6 PWM Channels with Programmable Resolution from 2 to 16 Bits

 Output Compare Modulator

Figure 1 : AT mega128 microcontroller pin assignment



JX-Mega128 : ATmega128 Microcontroller Project board

 8-channel, 10-bit ADC

 Byte-oriented Two-wire Serial Interface

 Dual Programmable Serial USARTs

 Master/Slave SPI Serial Interface

 Programmable Watchdog Timer with On-chip Oscillator

 On-chip Analog Comparator

Special Microcontroller Features

 Power-on Reset and Programmable Brown-out Detection

 Internal Calibrated RC Oscillator

 External and Internal Interrupt Sources

 Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down,

Standby, and Extended Standby

 Software Selectable Clock Frequency

 Global Pull-up Disable

I/O and Packages

 53 Programmable I/O Lines

 64-lead TQFP and 64-pad QFN/MLF

Operating Voltages 4.5 - 5.5V ATmega128

The ATmega128 provides the following features: 128K bytes of In-System Programmable

Flash with Read-While-Write capabilities, 4K bytes EEPROM, 4K bytes SRAM, 53 general purpose

I/O lines, 32 general purpose working registers, Real Time Counter (RTC), four flexible Timer/

Counters with compare modes and PWM, 2 USARTs, a byte oriented Two-wire Serial Interface,

an 8-channel, 10-bit ADC with optional differential input stage with programmable gain,

programmable Watchdog Timer with Internal Oscillator, an SPI serial port, IEEE std. 1149.1

compliant JTAG test interface, also used for accessing the On-chip Debug system and programming

and six software selectable power saving modes. The Idle mode stops the CPU while allowing

the SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning.

The device is manufactured using Atmels high-density nonvolatile memory technology.

The Onchip ISP Flash allows the program memory to be reprogrammed in-system through an SPI

serial interface, by a conventional nonvolatile memory programmer, or by an On-chip Boot program

running on the AVR core. The boot program can use any interface to download the application

program in the application Flash memory. Software in the Boot Flash section will continue to run

while the Application Flash section is updated, providing true Read-While-Write operation.

The ATmega128 AVR is supported with a full suite of program and system development

tools including: C compilers, macro assemblers, program debugger/simulators, in-circuit emulators

and evaluation kits.

JX-Mega128 : ATmega128 Microcontroller Project board

4. The JX-Mega128 board description

Figure 2 shows the layout of JX-Mega128 board. The complete schematic diagram is

shown in the figure 3. The haerst of operation is ATmega128 microcontroller. It works with

16MHz clock from external crystal and 32.768kHz external crystal for Real-time counter within

the microcontroller chips. The +5V supply voltage is getted from 3 ways as :

1. Via DC jack adaptor. The unregulated +6 to +9Vdc is applied and is regulated

as fixed +5V by 78R05 regulated IC.

2. Via DC termainal. The unregulated +6 to +9Vdc is applied and is regulated as

fixed +5V by 78R05 regulated IC.

3. Via USB port by selection the Vcc jumper switch to USB position.

User must select only one power source for JX-Mega128 board in same time.

Figure 2 : The JX-Mega128 board layout

0 1 2 3 4 5 6 7

D0 D1 D2 D3 D4 D5 D6 D7

SCL

SDA

Rx1

Tx1

ICP1

XCK

PORTD

8 9

10 11 12 13 14 15

C0 C1 C2 C3 C4 C5 C6 C7

PORTC

16 17 18 19 20 21 22 23

A0 A1 A2 A3 A4 A5 A6 A7

PORTA

48 49 50

G0 G1 G2

PORTG

+VIN

GND

+5V

------

oar

PORTB

24 25 26 27 28 29 30 31

B0 B1 B2 B3 B4 B5 B6 B7

PORTE

35 36 37 38 39

E3 E4 E5 E6 E7

PORTF

40 42 43 44 45 46 47 48

ADC0

ADC1

ADC2

ADC3

ADC4

ADC5

ADC6

ADC7

PWM0

PWM1

PWM2

PWM3

PWM4

PWM5

GND

LED

PG0

PROG

RESET

USB DATA

USB

EXT

Vcc

EXT-POWER

WIRING pin

compatible

6~9V

JX-Mega128

ATme

a128 micro. board

Wiring digital I/O

pin 24 to 31 and 35 to 39

Analog input port/

Wiring digital I/O

pin 40 to 48

PWM output port

Wiring digital I/O pin 0 to 15

Wiring digital I/O

pin 0 to 15 /LCD port

Wiring digital I/O

pin 48 to 50

16x2 LCD module

ISP connector

+5V indicator

+6 to +9Vdc Adaptor jack

mini-USB port

(download/communication)

Supply voltage

and Ground

Vcc jumper selection switch

from USB or EXT (external via

DC jack or Terminal)

Power switch for the

exterrnal voltage supply

USB connection status indicator

Serial data LED indicator

Program mode button

+6 to +9Vdc Terminal

RESET button

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