Featuresã Compatible with MCS-51™ Productsã 4K Bytes of In-System Reprogrammable Flash Memory– Endurance: 1,000 Write/Erase Cyclesã Fully Static Operation: 0 Hz to 24 MHzã Three-Level Program Memory Lockã 128 x 8-Bit Internal RAMã 32 Programmable I/O Linesã Two 16-Bit Timer/Countersã Six Interrupt Sourcesã Programmable Serial Channelã Low Power Idle and Power Down ModesDescriptionThe AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4Kbytes of Flash Programmable and Erasable Read Only Memory (PEROM). Thedevice is manufactured using Atmel’s high density nonvolatile memory technologyand is compatible with the industry standard MCS-51™ instruction set and pinout. Theon-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU withFlash on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer whichprovides a highly flexible and cost effective solution to many em...