8 Pin Programmable Resistor IC

8-Bit Microcontroller with 8K Bytes Flash AT89C52-24JI

Features

• Compatible with MCS-51™ Products

• Fully Static Operation: 0 Hz to 24 MHz

• 8K Bytes of In-System Reprogrammable Flash Memory – Endurance: 1,000 Write/Erase Cycles

• Three-Level Program Memory Lock

• Eight Interrupt Sources

• Programmable Serial Channel

• Low Power Idle and Power Down Modes

• 256 x 8-Bit Internal RAM

• 32 Programmable I/O Lines

• Three 16-Bit Timer/Counters

Description

The AT89C52 is a low-power, high-performance CMOS 8-bit microcomputer with 8K bytes of Flash programmable and erasable read only memory (PEROM). The device is manufactured using Atmel’s high density nonvolatile memory technology and is compatible with the industry standard 80C51 and 80C52 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputer which provides a highly flexible and cost effective solution to many embedded control applications.

The AT89C52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, 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 AT89C52 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 oscillator, disabling all other chip functions until the next hardware reset.