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CategoryIntegrated Circuits (ICs)
FamilyEmbedded - Microcontrollers
Core Processor8051
Core Size8-Bit
Number of I/O32
Program Memory Size8KB (8K x 8)
Program Memory TypeFLASH
RAM Size256 x 8
Voltage - Supply (Vcc/Vdd)4 V ~ 5.5 V
Data Converters-
Oscillator TypeInternal
Operating Temperature0°C ~ 70°C
Package / Case40-DIP (0.600", 15.24mm)
Supplier Device Package40-PDIP


The Atmel AT89S52 is a powerful , low-power CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. This device is manufactured using Atmel’s high-density non volatile memory technology and is compatible with the industry-standard 8051 instruction set and pin out. The on-chip Flash memory allows the program memory to be reprogrammed in-system or by a conventional non volatile memory programmer.

The Atmel AT89S52 provides a highly-flexible and cost-effective solution to many embedded control applications. AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, Watchdog timer, 32 I/O lines, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, on-chip oscillator, a full duplex serial port, and clock circuitry. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Power-down mode saves the RAM contents ,disabling all other chip functions until the next interrupt or hardware reset.

Features of AT89S52

  • Compatible with MCS 51
  • 8K Bytes of In-System Programmable (ISP) Flash Memory
  • Low-power Idle and Power-down Modes
  • Endurance: 10,000 Write/Erase Cycles
  • Dual Data Pointer
  • 4.0V to 5.5V Operating Range
  • Three-level Program Memory Lock
  • Fully Static Operation: 0 Hz to 33 MHz
  • 256 x 8-bit Internal RAM
  • Three 16-bit Timer/Counters
  • Eight Interrupt Sources
  • Full Duplex UART Serial Channel
  • Interrupt Recovery from Power-down Mode
  • Watchdog Timer
  • Power-off Flag
  • Fast Programming Time
  • Flexible ISP Programming (Byte and Page Mode)
  • 32 Programmable I/O Lines

Pin Diagram of AT89S52