AT89C51 Microcontroller IC

Features

• Compatible with MCS-51 Products
• 4K Bytes of In-System Reprogrammable Flash Memory
• Fully Static Operation: 0 Hz to 24 MHz
• Three-level Program Memory Lock
• 128 x 8-bit Internal RAM32 Programmable I/O Lines
• Two 16-bit Timer/CountersSix Interrupt Sources
• Programmable Serial Channel
• Low-power Idle and Power-down Modes
• 40-pin DIP

DataSheet:  https://pdf1.alldatasheet.com/datasheet-pdf/view/56215/ATMEL/AT89C51.html