Features

• 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 (in x1 and x2 Modes)

• 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

1. Description

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.