The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of in-system programmable Flash memory. The device is manufactur. AT89C52 is an 8-bit microcontroller and belongs to Atmel’s family. AT89C52 has 8KB of Flash programmable and erasable read only memory ( PEROM). AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family. ATMEL 89C51 has 4KB of Flash programmable and erasable read only memory.

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Atmel has also created an LP low power series of these chips with a “Single Cycle Core”, making the execution speed of these chips considerably faster. Hello, this very post is related to the RPM meter project. Newer Post Older Post Home. Reset pin; Active high.

Most commonly used Crystal is 89552. And control pins RS, RW and E to the pin 12,13,14 pin 2,3,4 of port 3 of microcontroller respectively.

Please tell Me if any one know Port 2 outputs the high byte of the external memory address when the address is 16 bits wide.

In this application, Port 0 outputs the low byte of the external memory address, time-multiplexed with the byte being written or read. Crystal oscillator is used to generate clock pulses, and clock pulse is used to provide the mean for timing calculation, which is mandatory to synchronise all the events.


AT89C52 Microcontroller

Circuit diagram for LCD interfacing with microcontroller is shown in the above figure. Based on the Intel core, the AT89 series remains very popular as general purpose microcontrollers, due to their industry standard instruction set, their low unit cost, and the availability of these chips in DIL DIP packages. There are two different memory types: So first let’s understand the 16 pins of Mucrocontroller module. Input receiver for serial communication.

Contrast Setting, connected to Vcc thorough a variable resistor. Views Read Edit View history. Except P 0 which needs external pull-ups, rest of the ports have internal pull-ups. Skip to main content.

Feel free to leave a response. Read from external data memory.

Filed under DescriptionHow Stuff Works? Check your circuit connections again. This pin is used to enable the nicrocontroller when a high to low pulse is given to it. In1 machine cycle requires 12 crystal pulses to execute and we have use Write to external data memory.

LED Interfacing with Microcontroller (89S52) Tutorial with Circuit Diagram & Programming

Interface SD Card with Arduino. Each consists of a latch Special Function Registers P0 through P3an output driver, and an input buffer. The output microclntroller of Ports 0 and 2, and the input buffers of Port 0, are used in accesses to external memory. Function msdelay has been created to create delay in milliseconds and called frequently in the program, it is called so that LCD module can have sufficient time to execute the internal operation and commands.


There are many types of variables and constants in embedded C like int, char, unsigned int, float etc, you can learn them easily.

Will the circuit works if I do not use reset circuit? Getting Started with Microcontroller.

And set it to 1, if we are reading from LCD module. In other projects Wikimedia Commons.

We are not using any external memory so we connected Pin31 to Vcc. Program pulse input during Flash programming.

By using this site, you agree to the Terms of Mcrocontroller and Privacy Policy. You must first of all glance over the project here.

AT89C52 | 89C52 Microcontroller Datasheet & Pin Description

Thanku for ur explanation and code. AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family. Posted by Muhammad Ahmed on