AT89C2051-24SJ

Product Overview

Category

The AT89C2051-24SJ belongs to the category of microcontrollers.

Use

This microcontroller is commonly used in various electronic applications that require a compact and efficient control system.

Characteristics

• Low-power, high-performance CMOS 8-bit microcontroller
• 2KB of Flash memory for program storage
• 128 bytes of RAM for data storage
• 15 programmable input/output (I/O) pins
• Operating voltage range: 2.7V to 6V
• Clock frequency: 0 to 24 MHz
• In-system programmable using an SPI-compatible interface

Package

The AT89C2051-24SJ is available in a 20-pin plastic small outline (SO) package.

Essence

This microcontroller provides a cost-effective solution for embedded control applications with its compact size and versatile features.

Packaging/Quantity

The AT89C2051-24SJ is typically packaged in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Architecture: 8-bit
• Program Memory Size: 2KB
• CPU Speed: Up to 24 MHz
• Data RAM Size: 128 bytes
• Number of I/O Pins: 15
• Operating Voltage Range: 2.7V to 6V
• Operating Temperature Range: -40°C to +85°C
• Interface Type: SPI-compatible

Detailed Pin Configuration

1. P1.0 (Pin 1): Port 1, Pin 0
2. P1.1 (Pin 2): Port 1, Pin 1
3. P1.2 (Pin 3): Port 1, Pin 2
4. P1.3 (Pin 4): Port 1, Pin 3
5. P1.4 (Pin 5): Port 1, Pin 4
6. P1.5 (Pin 6): Port 1, Pin 5
7. P1.6 (Pin 7): Port 1, Pin 6
8. P1.7 (Pin 8): Port 1, Pin 7
9. RST (Pin 9): Reset Pin
10. XTAL2 (Pin 10): Crystal Oscillator Input/Output
11. XTAL1 (Pin 11): Crystal Oscillator Input
12. GND (Pin 12): Ground
13. P3.0 (Pin 13): Port 3, Pin 0
14. P3.1 (Pin 14): Port 3, Pin 1
15. P3.2 (Pin 15): Port 3, Pin 2
16. P3.3 (Pin 16): Port 3, Pin 3
17. P3.4 (Pin 17): Port 3, Pin 4
18. P3.5 (Pin 18): Port 3, Pin 5
19. VCC (Pin 19): Supply Voltage
20. P3.6 (Pin 20): Port 3, Pin 6

Functional Features

• In-system programmable using an SPI-compatible interface
• On-chip Flash memory for program storage
• Low-power consumption for energy-efficient applications
• Versatile I/O pins for interfacing with external devices
• Built-in reset circuitry for reliable system initialization
• Crystal oscillator for accurate timing control

Advantages and Disadvantages

Advantages

• Compact size and low-cost solution for embedded control applications
• Wide operating voltage range allows flexibility in power supply options
• In-system programmability enables easy firmware updates
• Versatile I/O pins provide flexibility in interfacing with external devices

Disadvantages

• Limited program memory size (2KB) may restrict the complexity of applications
• Limited data RAM size (128 bytes) may limit the amount of data that can be processed simultaneously
• Lack of built-in peripherals may require additional external components for certain applications

Working Principles

The AT89C2051-24SJ microcontroller operates based on an 8-bit architecture. It executes instructions stored in its Flash memory and utilizes the on-chip RAM for temporary data storage. The microcontroller communicates with external devices through its I/O pins, which can be configured as inputs or outputs.

Upon power-up or reset, the microcontroller initializes itself using the built-in reset circuitry. It relies on an external crystal oscillator connected to XTAL1 and XTAL2 pins for accurate timing control.

The AT89C2051-24SJ can be programmed in-system using an SPI-compatible interface, allowing for easy firmware updates without the need for physical removal of the microcontroller.

Detailed Application Field Plans