89S51 Atmel Microcontroller IC

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.

FEATURES:

• 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)

SPECIFICATIONS:

• Core Processor: 8051      
• Data Bus Width: 8 bit      
• Maximum Clock Frequency: 33 MHz
• Program Memory Size: 4 KB      
• Program Memory Type: Flash     
• RAM Size: 128 B    
• ADC: No                                         
• Number of Programmable I/Os: 32          
• Number of Timers: 2             
• Supply Voltage Range: 4 V to 5.5 V
• Package: PDIP

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  89S51

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