Features

 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)

 

 

Description

The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K

bytes of in-system programmable Flash memory. The device is manufactured using

Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 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 in-system programmable Flash on a

monolithic chip, the Atmel AT89S51 is a powerful microcontroller which provides a

highly-flexible and cost-effective solution to many embedded control applications.

The AT89S51 provides the following standard features: 4K bytes of Flash, 128 bytes of

RAM, 32 I/O lines, Watchdog timer, two data pointers, two 16-bit timer/counters, a fivevector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and

clock circuitry. In addition, the AT89S51 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, serial port, and

interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next external

interrupt or hardware reset

 

 

 

 

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