Atmega 8 Development Board - S/N 138020

Product Description

1. ***1 Development board (*****1): 
1.1. Features 
***1 development board is a ***1 micro controller based mother board. It can be use for various embedded system development applications and in the field of robotics as a brain of the robot. This board have the following features.
 
Compatible with most of the ***1 and ***2 series of *0 pin microcontrollers.
 
Available with NXP P*9v*1rd2 micro controller
 
On board motor driver for driving 2 DC motors or 1 stepper motors
 
Motor enable disable control switch
 
Onboard 4 channel ADC optional
 
LCD interface
 
PC interface through UART
 
*1.***2 MHz crystal
 
Exposed all I/O port for general-purpose application
 
five tact switches for external , reset and interrupt
 
Four test LEDs for status and debugging purpose
 
Buzzer for generating audible response
 
Exposed ISP pins for Programming
 
on board programmer for p*9v*1rd2 microcontroller
 
On board regulated power supply
 
Dual power supply for logic and driving load
 
1.2 Parts description and connection details 
Voltage Regulator 
Here IC***7 is used as a voltage regulator. It is a 5V voltage regulator IC used to provide a constant voltage of 5Vto the micro controller and other peripherals attached in the main board.
 
Level converter 
Here IC **2 is used it is basically use to connect the motherboard with the PC. It provides a voltage level conversion in between the serial port of PC and serial port of our motherboard.
 
Motor Driver 
Here IC L**3NE is used as a motor driver. It takes from micro controller and can able to drive high current high voltage inductive loads, relays, solenoids, DC motors and stepper motors. The L**3NE is a high-current H bridge driver. The L**3NE is designed to provide bidirectional drive currents of up to ***-mA at voltages from 4.5 V to *6 V. The connection details of this IC is given below
In*- Port2_4 Out *- M0
 In*- Port2_5 Out *- M1
In*- Port2_6 Out *- M2
In*- Port2_7 Out *- M3
 
Buzzer 
Active low It can be easily use to get audible response from the controller. The connection details is given below. Port0_3
 
Serial port 
This is use to download program in the micro controller through PC and can be use to communicate with the PC through UART.
 
LCD interface 
It can be used to interface a*6x2 LCD in 4 bit mode or it can also be used as a general purpose output port. The pin connections for interfacing a LCD are given bellow.
 RS- Port0_0
RW- Port 0_1
 E- Port0_2
 D*- Port0_4
D*- Port0_5
D*- Port0_6
D*- Port0_7
 
 
Switches 
S*-Port3_2
S*-Port3_3
S*-Port3_4
S*-Port3_5
These switches are connected to port pins of micro controller to give external s and interrupt. All this switches are active low. RST-Reset This switch can be use to reset the micro controller. POWER-Power on This is basically a slide switch. It is use to switch on or off the main power supply of the motherboard. MOTOR ENABLE This is basically a slide switch. It is use to enable or disable the motor driver.
 
LEDs 
LED*-Port2_0
LED*- Port2_1
LED*-Port2_2
LED*-Port2_3
These LEDs are connected to port pin in active high mode. LED*-Power ON/OFF indicator LED
PSMAIN 
This is use to connect power supply to the Main board (minimum 6VDC maximum *6VDC)
 
PSMOT 
This is use to connect power supply to the motor (minimum 5VDC maximum *2VDC)
 
2. The P*9v*1RD2 Microcontroller 
2.1 Description 
The P*9V*1RD2 is an *0C*1 microcontroller with *4 kB Flash and ***4 bytes of data RAM. A key feature of the P*9V*1RD2 is its X2 mode option. The design engineer can choose to run the application with the conventional *0C*1 clock rate (*2 clocks per machine cycle) or select the X2 mode (6 clocks per machine cycle) to achieve twice the throughput at the same clock frequency. Another way to benefit from this feature is to keep the same performance by reducing the clock frequency by half, thus dramatically reducing the EMI. The Flash program memory supports both parallel programming and in serial In-System Programming (ISP).
Parallel programming mode offers gang-programming at high speed, reducing programming costs and time to market. ISP allows a device to be reprogrammed in the end product under software control. The capability to field/update the application firmware makes a wide range of applications possible. The P*9V*1RD2 is also In- application Programmable (IAP), allowing the Flash program memory to be reconfigured even while the application is running.
 
 
2.2. Features: 
 
*0C*1 Central Processing Unit
 
5 V Operating voltage from 0 to *0 MHz
 
*4 KB of on-chip Flash program memory with ISP (In-System Programming) and
 
IAP (In-Application Programming)
 
Supports **-clock (default) or *-clock mode selection via software or ISP
 
SPI (Serial Peripheral Interface) and enhanced UART
 
PCA (Programmable Counter Array) with PWM and Capture/Compare functions
 
Four *-bit I/O ports with three high-current Port 1 pins (*6 mA each)
 
Three **-bit timers/counters
 
Programmable Watchdog timer (WDT)
 
Eight interrupt sources with four priority levels