Features

Compatible with MCS®-51Products

2K Bytes of Reprogrammable Flash Memory

– Endurance: 10,000 Write/Erase Cycles

2.7V to 6V Operating Range

Fully Static Operation: 0 Hz to 24 MHz

Two-level Program Memory Lock

128 x 8-bit Internal RAM

15 Programmable I/O Lines

Two 16-bit Timer/Counters

Six Interrupt Sources

Programmable Serial UART Channel

Direct LED Drive Outputs

On-chip Analog Comparator

Low-power Idle and Power-down Modes

Green (Pb/Halide-free) Packaging Option

Description

The AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with

2K 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 MCS-51 instruction set. By combining a

versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C2051 is a powerful

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

embedded control applications.

The AT89C2051 provides the following standard features: 2K bytes of Flash, 128

bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt

architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator

and clock circuitry. In addition, the AT89C2051 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.