AT89C2051 8-bit Microcontroller: Pinout, Circuit Diagram and Program

The AT89C2051 microcontroller is a versatile and widely used 8-bit microcontroller that has found its place in numerous embedded systems and electronic projects. Known for its compact size, low power consumption, and rich feature set, the AT89C2051 offers a cost-effective solution for various applications.

In this article, we will explore the features, capabilities, and applications of the AT89C2051 microcontroller. Whether you are an electronics enthusiast, hobbyist, or professional developer, understanding the potential of the AT89C2051 will enable you to design innovative projects and harness the power of this reliable microcontroller.

What is AT89C2051 Microcontroller

The AT89C2051 is an 8-bit microcontroller produced by Atmel, a subsidiary of Microchip Technology. It belongs to the 8051 family of microcontrollers, which is a popular and widely used architecture for embedded systems. The AT89C2051 is specifically designed for low-power and high-speed applications.

AT89C2051 Specification

• CPU clock frequency: up to 12MHz
• ROM capacity: 2KB
• RAM capacity: 128B
• Number of I/O ports: 8
• Interrupt vectors: 2
• Serial port: 1 (programmable)
• Timer/Counter: 2 (programmable)
• Operating voltage range: 2.4V-6V
• Static working current: maximum 10μA
• Shutdown mode working current: maximum 500nA

AT89C2051 Features

• Architecture: The AT89C2051 follows the von Neumann architecture, featuring an 8-bit CPU, 128 bytes of internal RAM, and 2 KB of Flash memory for program storage.
• Clock Speed: It can operate at a maximum frequency of 24 MHz, allowing for efficient execution of instructions.
• I/O Pins: The microcontroller has a total of 15 I/O pins, which can be configured as input or output pins as per the application requirements.
• Timers/Counters: The AT89C2051 includes two 16-bit timers/counters, Timer 0 and Timer 1. These timers can be used for various timing and counting operations.
• Serial Communication: It supports a built-in UART (Universal Asynchronous Receiver/Transmitter) for serial communication. This allows for data transmission and reception with other devices using standard serial protocols like RS232.
• Interrupts: The microcontroller supports both hardware and software interrupts, allowing for efficient handling of external events and real-time operations.
• Power Management: The AT89C2051 is designed to operate in a wide voltage range, typically from 2.7V to 6V. It also offers various power-saving modes to optimize energy consumption in battery-powered applications.

AT89C2051 Pinout

AT89C2051 has a total of 20 pins, including 8 I/O ports and 5 interrupt input pins. The following is the specific function of each pin:

• P1.0-P1.7: 8 programmable I/O ports
• P3.0-P3.4: 5 external interrupt input ports
• VCC: Positive power supply
• GND: ground
• RST: reset input
• XTAL1: crystal oscillator input pin
• XTAL2: crystal oscillator output pin

AT89C2051 Application

The AT89C2051 microcontroller is commonly used in various application scenarios that require a compact and low-power embedded system solution. Here are some typical application areas for the AT89C2051:

Industrial Automation: The AT89C2051 can be utilized in small-scale industrial automation systems for tasks such as data acquisition, control algorithms, and interfacing with sensors and actuators.

Home Automation: It can be employed in home automation systems to control lighting, temperature, security, and other household devices through its I/O pins.

Instrumentation and Measurement: The microcontroller can be utilized in measurement and instrumentation applications, such as data logging, signal conditioning, and control in laboratory setups or industrial environments.

Consumer Electronics: The AT89C2051 can be integrated into various consumer electronic devices like remote controls, small appliances, electronic toys, and display units.

Automotive Electronics: It can be used in automotive applications that require simple control functions, such as controlling lighting systems, security features, and dashboard displays.

Educational Projects: It is often employed in educational projects and hobbyist circuits to teach and learn about microcontroller programming, interfacing, and basic system design.

DIY Projects: The microcontroller's compact size, low power consumption, and versatility make it suitable for various do-it-yourself (DIY) projects, such as robotics, home automation prototypes, electronic gadgets, and more.

AT89C2051 Circuit Diagram

Wireless remote control switch circuit diagram (AT89C2051 circuit diagram)

Features

》1. Equipped with lightning protection device design, the performance is safe and reliable, and a fast protection tube is installed inside, which can effectively prevent lightning strikes, resist surges, and protect our circuit safety;

》2. Partition wall remote control, wireless long-distance remote control can be carried out through the wall, and the lights in the living room can be controlled in the room, which is safe and practical, and brings great convenience to life;

》3. Two-way control, you can choose to use the manual switch on the wall, or you can choose to use the remote control to control, making people's home more convenient;

》4. Complementary interference, using radio frequency identification technology, has no directionality, and will not interfere with each other with the same model products used by neighbors, and will not cause unnecessary trouble;

》5. The incoming call is self-extinguishing. If the power grid fails and the call is made again, the switch can be automatically turned off to avoid waste of electricity;

》6. Several kinds of control, even if only a multi-key remote control can be used to centrally control the intelligent remote control switch of the whole family, which greatly facilitates our life;

》7. Easy to install, using the standard 86-type wall switch appearance design, no need to connect the troublesome zero line, no need to make any changes to the lamps and accessories, and can directly and quickly replace the original wall switch;

》8. Intelligent identification, the switch can identify the wireless remote control, the switch and the remote control do not need to be purchased each time, people can freely choose and match, upgrade and add at will, and configure by themselves.

How to Program AT89C2051

AT89C2051 is a series of products based on 80C51 microcontroller. It is a low-cost microcontroller with strong processing capability and extremely low power consumption. It has good reliability and programmability. It is an ideal microcontroller. . It is a microcontroller that can be used to control various systems. It has fast processing speed, high reliability, and extremely low power consumption. It is an ideal microcontroller.

The burning program is to burn the program into the AT89C2051 microcontroller, so that the single-chip microcomputer can work normally. The burning program needs a burner, which can be connected to the computer through the USB interface, and then use special software to burn the program into the microcontroller.

The steps of programming the AT89C2051 program are as follows:

Step1. Prepare the programmer and AT89C2051 microcontroller, connect the programmer to the computer, and then insert the microcontroller into the programmer.

Step2. Download and install the burning software. The burning software can be downloaded from the Internet. After the installation is complete, open the burning software and connect the burner. The burning software will automatically detect the burner.

Step3. Select the program file, select the program file to be burned, and then click the burn button, the burning software will burn the program file into the AT89C2051 microcontroller.

Step4. After the programming is completed, the AT89C2051 single-chip microcomputer can work normally, and the corresponding control work can be carried out.

It is a simple process to program the AT89C2051 single-chip microcomputer, but it should be noted that before programming the program, you must first confirm whether the program file is correct, so as not to program the wrong program and cause the single-chip microcomputer to fail to work normally.

AT89C2051-24pu and AT89C2051-24pi

The AT89C2051-24PU and AT89C2051-24PI are two variants of the AT89C2051 microcontroller from Atmel. Both variants belong to the 8051 family of microcontrollers and offer similar features and capabilities.

Here are the features,

In summary, the AT89C2051-24PU and AT89C2051-24PI are similar in terms of their features and capabilities. The main difference lies in their physical packaging options, with the former packaged in a PDIP and the latter in a PLCC. These microcontrollers are well-suited for low-power, cost-effective embedded system designs with moderate complexity.

AT89C2051 Manufacturer

he AT89C2051 microcontroller is manufactured by Atmel Corporation. Atmel Corporation is a well-known semiconductor manufacturer that specializes in the design and production of microcontrollers, microprocessors, and other integrated circuits. However, it's important to note that Atmel Corporation was acquired by Microchip Technology Inc. in 2016. Therefore, while the AT89C2051 microcontroller was originally manufactured by Atmel, it is now produced and supported by Microchip Technology.

Conclusion

In conclusion, the AT89C2051 microcontroller is a versatile and powerful 8-bit microcontroller that offers a wide range of features and capabilities. With its compact size, low power consumption, and rich peripheral set, the AT89C2051 is an excellent choice for embedded systems and electronic projects.

By understanding its features, pinout configuration, and applications, you can leverage the full potential of the AT89C2051 in your projects. Whether you are designing home automation systems, digital control applications, or smart devices, the AT89C2051 microcontroller provides a reliable and cost-effective solution. Stay updated with the latest resources, datasheets, and community support to unlock new possibilities and create innovative projects with the AT89C2051 microcontroller.