The Atmel AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of in-system programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89S51 is a powerful microcontroller which provides a highly flexible and cost-effective solution to many embedded control applications.

Applications

• Embedded control systems
• Industrial automation
• Consumer electronics
• Instrumentation
• Robotics

Features

• Compatible with MCS-51 Products
• 4K Bytes of In-System Programmable (ISP) Flash Memory
• Endurance: 1,000 Write/Erase Cycles
• 4.0V to 5.5V Operating Range
• Fully Static Operation: 0 Hz to 33 MHz
• Three-level Program Memory Lock
• 128 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Two 16-bit Timer/Counters
• Five Interrupt Sources
• Programmable UART Serial Channel
• Direct LED Drive Outputs
• On-chip Oscillator and Clock Circuitry
• Idle and Power-down Modes

Benefits

• Flexible: A versatile microcontroller suitable for a wide range of applications.
• Cost-effective: Provides a balance of performance and features at a competitive price.
• Easy to program: Uses the widely adopted 8051 architecture, making it familiar to many developers.
• In-system programmable: Flash memory allows for convenient firmware updates and customization.
• Low power consumption: Offers Idle and Power-down modes for energy-efficient operation.

Additional Details

The AT89S51 operates at a voltage range of 4.0V to 5.5V and can function up to 33 MHz. It includes a programmable UART serial channel for serial communication. The device is typically packaged in a 40-pin PDIP, PLCC, or TQFP. The flash memory is capable of at least 1,000 write/erase cycles. The AT89S51 is now end-of-life but was a popular choice for embedded systems due to its simplicity and ease of use.