The AT89C51ED2-RDTUM is a low-cost 8-bit microcontroller from Microchip's 8051 family. Its features include 128 bytes of internal RAM, a 4K byte on-chip Flash memory, an UART, and a timer/counter. It also has 32 Bytes of OTP ROM. The device is a low-power industry standard, 8051-compatible MCU. It supports Fast and low-power operation from a single 3.6V supply and has an operating temperature range of -40 °C to +85 °C. This device is ideal for applications such as consumer and industrial motor control, power regulation for appliances, HVAC, dataloggers and other applications that require reliable, low cost and low power 8-bit microcontrollers.