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ByB.V.S.S.Kusumakar

12104104074/4 B.Tech ECE-D

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Features

8KB In System Programmable flash memory

256KB internal RAM

32 programmable i/o lines Three 16bit timers

Interrupt recovery from power down mode

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of AT89S52

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Port 0Port 0 is an 8-bit open drain bi-directional I/O .Port 0 can also

be configured to be the multiplexed low order address/data busduring accesses to external program and data memory.

Rest of the ports are8-bit bi-directional I/O port with internal pull-ups.

RSTReset input. A high on this pin for two machine cycles while the

oscillator is running resets the device.

ALE/PROGAddress Latch Enable (ALE) is an output pulse for latching the

low byte of the address during accesses to external memory.

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PSENProgram Store Enable (PSEN) is the read strobe to

external program memory. EA/VPP

External Access Enable. EA must be strapped to

GND in order to enable the device to fetch code fromexternal program memory.

XTAL1Input to the inverting oscillator amplifier and input

to the internal clock operating circuit.

XTAL2Output from the inverting oscillator amplifier.

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EN:Line is called "Enable." This control line is used to tell the

LCD that you are sending it data. To send data to the LCD,your program should make sure this line is low (0).

RS:Line is the "Register Select" line. When RS is low (0), the

data is to be treated as a command or special instruction(such as clear screen, position cursor, etc.). When RS is high(1), the data being sent is text data which sould be displayedon the screen.

RW:Line is the "Read/Write" control line. When RW is low (0),

the information on the data bus is being written to the LCD.When RW is high (1), the program is effectively querying (orreading) the LCD.

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The 3^18encoders are a series of CMOS LSIs(Large Integrated Circuits) for remote controlsystem applications.

They are capable of encoding 18 bits ofinformation this consists of N address bitsand 18^N data bits.

It converts the parallel inputs into serial

output.

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The 3^18 decoders are a series of CMOS LSIsfor remote control system applications. Theyare paired with the 3^18 series of encoders.

For proper operation a pair ofencoder/decoder pair with the same numberof address and data format should beselected.

The 3^18 decoders are capable of decoding18 bits of information that consists of N bitsof address and 18N bits of data.

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A0-A7 are 8 bit Address pins for input.

AD0-AD3 are 4 bit Data/Address pins forinput.

TE-Transmission enable(active low)

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A relay is an electrical switch that opens andcloses under the control of another electricalcircuit.

In the original form, the switch is operated byan electromagnet to open or close one ormany sets of contacts.

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This software is a GUI used for coding This is also used for dumping the code into

the microcontroller.

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