Key facts
- Brand
- Atmel
- Model
- AT89C51RD2
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-05-02
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Atmel AT89C51RD2/AT89C51ED2 Datasheet
The AT89C51RD2 and AT89C51ED2 are high‑performance 8‑bit CMOS microcontrollers compatible with the 80C52 core. They integrate up to 64 KB of flash program memory, on‑chip RAM, EEPROM (ED2 variant), and a range of peripherals such as timers, UART, SPI, and a programmable counter array.
This document lists the device features, electrical characteristics, package options, special function register (SFR) mappings, and ordering information. It also includes block diagrams, pin tables, and detailed register descriptions for developers and hardware designers.
Atmel AT89C51RD2 specifications
| Flash Memory Size | 64 KB |
|---|---|
| Expanded RAM (XRAM) | 1792 bytes |
| EEPROM Block (ED2 only) | 2048 bytes |
| Operating Temperature Range | -40 °C to +85 °C |
| Supply Voltage | 2.7 V to 5.5 V |
| Maximum Clock Frequency (Standard Mode) | 40 MHz |
| Write Cycle Endurance | 100 k cycles |
| Interrupt Sources | 9 sources with 4 priority levels |
| Package Options | PLCC44, VQFP44, PLCC68, VQFP64, PDIL40 |
All Atmel AT89C51RD2 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the flash memory capacity of the AT89C51RD2/ED2?
The device provides 64 KB of on‑chip flash program and data memory.
Which package types are available for this microcontroller?
It is offered in PLCC44, VQFP44, PLCC68, VQFP64, and PDIL40 packages.
What is the flash memory size of the AT89C51RD2/ED2?
The device includes 64 KB of on‑chip Flash program and data memory.
What voltage range does the AT89C51RD2/ED2 operate on?
It operates from a single supply of 2.7 V to 5.5 V.