Microchip AT89C51RD2-SLSUM 8-Bit Microcontroller Datasheet and Technical Specifications
The Microchip AT89C51RD2-SLSUM is a high-performance, 8-bit microcontroller belonging to the classic 8051 family, renowned for its robust architecture and widespread use in embedded control applications. This device integrates a wealth of features into a single package, making it a versatile solution for complex projects requiring substantial program memory, data storage, and peripheral integration.
Core Architecture and Performance
At its heart, the microcontroller features an 8051-compatible core operating at up to 60 MHz. This enhanced core executes instructions in fewer clock cycles than the original architecture, delivering a significant boost in processing throughput. It retains the standard 8051 organization but is augmented with modern features for improved performance and efficiency.
Memory Configuration
A defining characteristic of the AT89C51RD2 is its expansive and flexible memory subsystem.
Program Memory: It incorporates 64 KB of In-System Programmable (ISP) Flash memory. This non-volatile memory allows for firmware to be erased and reprogrammed electrically while the device is resident in the end system, drastically simplifying development, testing, and field updates.
Data Memory: The device includes 1,024 bytes of on-chip RAM for data storage and 2 KB of expanded RAM (ERAM), which can be configured as either internal or external memory via software, providing exceptional flexibility for handling large data sets and complex variables.
Data Retention: A key feature is the integrated 8 KB boot ROM, which contains default serial programming routines and a powerful In-Application Programming (IAP) capability, allowing the firmware to modify its own Flash memory during operation.
Peripheral Set and I/O Capabilities
The microcontroller is equipped with a rich set of peripherals, making it a true system-on-chip solution:
I/O Ports: It offers four 8-bit bi-directional I/O ports (Ports 0, 1, 2, and 3), providing 32 general-purpose I/O lines for interfacing with external devices, sensors, and actuators.
Timers/Counters: Three versatile 16-bit timers/counters (Timer 0, 1, and 2) are available for tasks such as interval timing, event counting, or baud rate generation.
Serial Communication: It supports a Programmable Watchdog Timer (WDT) and a Hardware Monitor Timer (HWM) for enhanced system reliability. For communication, it includes a full-duplex Enhanced UART with independent baud rate generation and a 16-bit Data Pointer (DPTR) to accelerate variable and table accesses.
Interrupt System: The controller features an interrupt structure with 9 interrupt sources and 4 priority levels, ensuring responsive handling of time-critical external and internal events.
Key Technical Specifications
Operating Voltage: 4.5V to 5.5V
Operating Frequency: 0 Hz to 60 MHz
Temperature Range: Commercial (0°C to +70°C) / Industrial (-40°C to +85°C)
Packages: Available in multiple packages, including PLCC, QFP, and TQFP.
Power Management: Features Idle and Power-down modes for reduced power consumption. Power-down mode can be terminated by an external interrupt.
ICGOOODFIND
The Microchip AT89C51RD2-SLSUM stands as a powerful and highly integrated member of the 8051 family. Its combination of large, in-system programmable Flash memory, substantial on-chip RAM, and a comprehensive suite of peripherals makes it an exceptionally capable choice for a vast array of embedded systems, from industrial control and automation to sophisticated consumer devices. Its IAP functionality and robust feature set ensure it remains a relevant and reliable solution for complex control applications.
Keywords:
1. 8051-Compatible
2. In-System Programmable (ISP) Flash
3. 64KB Memory
4. Enhanced UART
5. Microcontroller
