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  • Compatible with MCS®-51 Products
  • 12K Bytes of In-System Programmable (ISP) Flash Program Memory – SPI Serial Interface for Program downloading – Endurance: 10,000 Write/Erase Cycles. 
  • 2K Bytes EEPROM Data Memory – Endurance: 100,000 Write/Erase Cycles
  • 64-byte User Signature Array
  • 2.7V to 5.5V Operating Range
  • Fully Static Operation: 0 Hz to 24 MHz
  • Three-level Program Memory Lock 
  • 256 x 8-bit Internal RAM 
  • 32 Programmable I/O Lines 
  • Three 16-bit Timer/Counters 
  • Nine Interrupt Sources 
  • Enhanced UART Serial Port with Framing Error Detection and Automatic Address Recognition
  • Enhanced SPI (Double Write/Read Buffered) Serial Interface 
  • Low-power Idle and Power-down Modes 
  • Interrupt Recovery from Power-down Mode 
  • Programmable Watchdog Timer 
  • Dual Data Pointer 
  • Power-off Flag 
  • Flexible ISP Programming (Byte and Page Modes) - Page Mode: 64 Bytes/Page for Code Memory, 32 Bytes/Page for Data Memory 
  • Four-level Enhanced Interrupt Controller ]
  • Programmable and Fuseable x2 Clock Option 
  • Internal Power-on Reset 
  • 42-pin PDIP Package Option for Reduced EMC Emission 
  • Green (Pb/Halide-free) Packaging Option


The AT89S8253 is a low-power, high-performance CMOS 8-bit microcontroller with 12K bytes of In-System Programmable (ISP) Flash program memory and 2K bytes of EEPROM data memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip downloadable Flash allows the program memory to be reprogrammed in-system through an SPI serial interface or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with downloadable Flash on a monolithic chip, the Atmel AT89S8253 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.