ATMEL AT89C55WD 8-Bit Microcontroller, 20KB Flash, 40-Pin DIP

The ATMEL AT89C55WD-24PU is a high-performance, low-power 8-bit CMOS microcontroller, built around a robust 8051 core. It features 20KB of reprogrammable flash memory and 256 bytes of internal RAM, making it a versatile solution for embedded control systems. Manufactured using Atmel's high-density non-volatile memory technology, it offers full compatibility with the industry-standard MCS®-51 instruction set and pinout, ensuring easy integration into existing designs.

The on-chip flash memory allows for user programming via a conventional non-volatile memory programmer, providing exceptional flexibility during development and production. By combining a powerful 8-bit CPU with substantial flash on a single monolithic chip, this microcontroller delivers a highly adaptable and cost-effective platform for a wide range of applications.

Key Features & Specifications

• Core & Compatibility: 8-bit CPU, fully compatible with MCS®-51 products.
• Memory: 20KB of flash program memory with 10,000 write/erase cycles and three-level memory lock for security; 256 x 8-bit internal RAM.
• I/O & Peripherals: 32 programmable I/O lines, three 16-bit timer/counters, and a full-duplex serial port (UART).
• Interrupts & Control: Eight interrupt sources with a two-level interrupt architecture, and a programmable serial channel.
• Power Management: Features low-power idle and power-down modes, with interrupt recovery from power-down to maximise energy efficiency.
• Reliability: Includes a hardware watchdog timer, dual data pointer, and a power-off flag for enhanced system robustness.
• Physical Interface: Supplied in a through-hole mountable 40-pin DIP package for easy prototyping and servicing.
• Operating Conditions: Maximum operating frequency of 24MHz, with a supply voltage range of 4V to 5.5V and an operating temperature range of -40°C to +85°C.

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