The Atmel AT89S52 Microcontroller or commonly known as AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K 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. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.

Features of Atmel AT89S52 Microcontroller:-

• 8K Bytes of In-System Programmable (ISP) Flash Memory.
  
• Endurance: 10,000 Write/Erase Cycles.
  
• 4.0V to 5.5V Operating Range.
  
• Endurance: 1,000 Write/Erase Cycles
  
• Fully Static Operation : 0 Hz to 33 MHz
  
• Three-level Program Memory Lock.
  
• 256 x 8-bit Internal RAM.
  
• 32 Programmable I/O Lines.
  
• Three 16-bit Timer/Counters.
  
• Eight Interrupt Sources.
  
• Full Duplex UART Serial Channel.
  
• Interrupt Recovery from Power-down Mode.
  
• Watchdog Timer.
  
• Dual Data Pointer.
  
• Low-power Idle and Power-down Modes.
  
• Power-off Flag
  
• Fast Programming Time

Applications of Atmel AT89S52 Microcontroller:-

• Multiple DIY projects.
  
• Projects requiring more than logical control for devices.
  
• Microcontroller applications for multiple device interface/Control.
  
• Replacement for Arduino module.
  
• Needs a USB AVR programmer.