Features

• Compatible with MCS®51 Products

• 4K 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

• Brown-out Detection

• Power-On Reset (POR)

• Green (Pb/Halide-free/RoHS Compliant) Packaging

Description

The AT89C4051 is a low-voltage, high-performance CMOS 8-bit microcontroller with

4K bytes of Flash programmable and erasable read-only memory. 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 AT89C4051 is a powerful

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

embedded control applications.

The AT89C4051 provides the following standard features: 4K 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 AT89C4051 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.