The document describes the features and characteristics of a microcontroller product that is 80C52 compatible, including six 8-bit I/O ports, three 16-bit timer/counters, 256 bytes of scratch pad RAM, etc.
The AT89C51RE2 is a high‑performance CMOS Flash version of the classic 8051 microcontroller family. It offers up to 128 KB on‑chip Flash, 8 KB of expandable XRAM, multiple I/O ports, two full‑duplex UARTs, SPI, a programmable counter array, and power‑saving modes for industrial‑grade applications.
The handbook contains sections on features, pin‑out tables, special‑function‑register mappings, power‑management options, electrical characteristics, and ordering information. It serves as a reference for designers needing detailed information on the device’s architecture, programming options, and hardware interfacing.
| Flash Memory | 128 KB |
|---|---|
| Expanded RAM (XRAM) | 8192 bytes |
| Operating Voltage | 2.7 V to 5.5 V |
| Temperature Range | -40 °C to +85 °C |
| Package Types | PLCC44, VQFP44 |
| Maximum CPU Frequency | 60 MHz |
The AT89C51RE2 contains 128 KB of on‑chip Flash memory.
It operates from 2.7 V up to 5.5 V.
The device provides 11 interrupt sources with four priority levels.
It is available in PLCC44 and VQFP44 packages.