The General Situation of AT89C51 The AT89C51 is a low-power, high-performance CMOS 8-bit puter with 4K bytes of Flash Programmable and Erasable Read Only Memory (PEROM) and 128 bytes RAM. The device is manufactured using Atmel’s high density nonvolatile memory technology and patible with the industry standard MCS-51? instruction set and pin out. The bines a versatile 8-bit CPU with Flash on a monolithic chip; the Atmel AT89C51 is a powerful puter which provides a highly flexible and cost effective solution to many embedded control applications. Features: ? Compatible with MCS-51? Products ? 4K Bytes of In-System Reprogrammable Flash Memory ? Endurance: 1,000 Write/Erase Cycles ? Fully Static Operation: 0 Hz to 24 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 ? Programmable Serial Channel ? Low Power Idle and Power Down Modes The AT89C51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator and clock circuitry. In addition, the AT89C51 is designed with static logic for operation down to zero frequency and supports two soft
