89c51 tutorial Feature and descriptions of 89c51

Feature and Descriptions of 89c51

89C51-pin diagram
89c51-block diagram
89c51-Pin Description
89c51-Oscillator Characteristics
89c51-Power Down Mode 
89c51-Programming the Flash
89c51-Programming Interface






About 89C51 Microcontroller




     Compatible with MCS-51 Products

     4 Kbytes 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 is a low-power, high-performance CMOS 8-bit microcomputer with 4 Kbytes of Flash Programmable and Erasable Read Only Memory (PEROM). The device is manufactured using Atmels high density nonvolatile memory technology and is compatible with the industry standard MCS-51 instruction set and pinout.


The on-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 with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.


The AT89C51 provides the following standard features: 4Kbytes 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 software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters,



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