Description

The AT89C55WD is a low-power, high-performance CMOS 8-bit microcontroller with 20K bytes of Flash programmable read only memory and 256 bytes of RAM. It is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry standard 80C51 and 80C52 instruction set and pinout.

The on-chip Flash allows the program memory to be user programmed by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C55WD provides a highly flexible and cost-effective solution to many embedded control applications.

Specifications and features

• Compatible with MCS®-51 Products
• 20K Bytes of Reprogrammable Flash Memory
• Endurance: 1000 Write/Erase Cycles
• 4V to 5.5V Operating Range
• 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
• Programmable Serial Channel
• Low-power Idle and Power-down Modes
• Interrupt Recovery from Power-down Mode
• Hardware Watchdog Timer
• Dual Data Pointer
• Power-off Flag

Application Scenarios

The AT89C55WD microcontroller can be used in a wide range of embedded control applications due to its versatility, low power consumption, and high-performance capabilities. Some possible application scenarios include:

• Home automation systems
• Industrial automation
• Robotics
• Security systems
• Smart energy management

Comparison

The AT89C55WD microcontroller offers several advantages such as:

• Low power consumption
• High-performance
• Flexible and cost-effective solution
• Compatibility with the industry standard 80C51 and 80C52 instruction set and pinout

However, it also has a few disadvantages to consider:

• Limited program memory size (20K bytes)
• Limited RAM size (256 bytes)
• Endurance of 1000 Write/Erase Cycles