AT89S852-12PC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89S852-12PC

8 bit Microcontroller with 8K bytes Flash

Atmel Corporation 

Features

Compatible with MCS-51TM Products

•• 8K bytes of In-System Reprogrammable Downloadable Flash Memory

SPI Serial Interface for Program Downloading

Endurance: 1,000 Write/Erase Cycles

• 2K bytes EEPROM

Endurance: 100,000 Write/Erase Cycles

2.7V to 6V 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

• Programmable UART Serial Channel

• SPI Serial Interface

• Low Power Idle and Power Down Modes

• Interrupt Recovery From Power Down

• Programmable Watchdog Timer

• Dual Data Pointer

•• Power Off Flag

Description

The AT89S8252 is a low-power, high-performance CMOS 8 bit microcomputer with

8K bytes of Downloadable Flash programmable and erasable read only memory and

2K bytes of EEPROM. The device is manufactured using Atmel’s high density non-

volatile memory technology and is compatible with the industry standard 80C51 in-

struction set and pinout. The on-chip Downloadable Flash allows the program mem-

ory to be reprogrammed in-system through an SPI serial interface or by a conven-

tional nonvolatile memory programmer. By combining a versatile 8 bit CPU with

Downloadable Flash on a monolithic chip, the Atmel AT89S8252 is a powerful micro-

computer which provides a highly flexible and cost effective solution to many embed-

ded control applications.

The AT89S8252 provides the following standard features: 8K bytes of Downloadable

Flash, 2K bytes EEPROM, 256 bytes of RAM, 32 I/O lines, programmable watchdog

timer, two Data Pointers, three 16 bit timer/counters, a six-vector two-level interrupt

architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition,

the AT89S8252 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 oscilla-

tor, disabling all other chip functions until the next interrupt or hardware reset.

The Downloadable Flash can be changed a single byte at a time and is accessible

through the SPI serial interface. Holding RESET active forces the SPI bus into a

slave input mode and allows the program memory to be written-from or read-to unless

Lock Bit 3 has been activated.

8 bit

Microcontroller

with 8K bytes

Flash

AT89S8252

Preliminary

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