AT89s51 adalah mikrokontroller keluaran ATMEL. Feature yang ada pada mikrokontroller ini adalah Compatible with MCS®-51 Products, 4K Bytes of In-System Programmable (ISP) Flash Memory (Endurance: 1000 Write/Erase Cycles), 4.0V to 5.5V Operating Range, Fully Static Operation: 0 Hz to 33 MHz, Three-level Program Memory Lock, 128 x 8-bit Internal RAM, 32 Programmable I/O Lines, Two 16-bit Timer/Counters, Six Interrupt Sources, Full Duplex UART Serial Channel, Low-power Idle and Power-down Modes, Interrupt Recovery from Power-down Mode, Watchdog Timer, Dual Data Pointer, Power-off Flag, Fast Programming Time, Flexible ISP Programming (Byte and Page Mode), Green (Pb/Halide-free) Packaging Option.
