AT89S8252-33QC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89S8252-33QC

8-bit Microcontroller with 8K Bytes Flash

Atmel Corporation 

Features

• Compatible with MCS-51™ 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

• 4V 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 nonvol-

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

instruction 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

conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU

with downloadable Flash on a monolithic chip, the Atmel AT89S8252 is a powerful

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

embedded control applications.

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

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

dog 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 fre-

quency and supports two software selectable power saving modes. The Idle Mode

stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt sys-

tem to continue functioning. The Power-down mode saves the RAM contents but

freezes the oscillator, disabling all other chip functions until the next interrupt or hard-

ware 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 serial

programming interface and allows the program memory to be written to or read from

unless Lock Bit 2 has been activated.

8-bit

Microcontroller

with 8K Bytes

Flash

AT89S8252

Rev. 0401E–02/00

1

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