AT89C2051-24PU 8-bit Microcontroller: Circuit Diagram, Pinout, and Datasheet

The AT89C2051-24PU is a CMOS 8-bit microcontroller in a 20 pin DIP package with low voltage and great performance. The device is made with high-density nonvolatile memory technology and is compatible with the  MCS-51  instruction set, which is widely used in the industry. It combines a versatile 8bit CPU with flash on a monolithic device to deliver a highly adaptable and cost-effective solution for a wide range of applications. On-chip analog comparator, on-chip oscillator, clock circuits, low power idle, and power-down modes are all included in the AT89C2051-24PU. This microcontroller features static logic for operating at low frequencies and two software-selectable power-saving modes. The power-down option saves RAM data but freezes the oscillator, effectively shutting off all chip functions until the next hardware reset.

The following are the standard characteristics of the AT89C2051-24PU: 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 connection, a precision analog comparator, on-chip oscillator, and clock circuits are among the features. The AT89C2051 also features static logic for operation at low frequencies and two software-selectable power-saving modes. The CPU is turned off in Idle Mode, although RAM, timers/counters, serial port, and interrupt system remains operational. The RAM contents are saved in power-down mode, but the oscillator is frozen, rendering all other chip functions useless until the next hardware reset.

The followings are AT89C2051-24PU Symbol, Footprint and 3D Model.

Symbol

Footprint

3D Model

• 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

Microchip Technology AT89C2051-24PU technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology AT89C2051-24PU.

AT89C2051-24PU Functional Block Diagram is shown as follows.

Functional Block Diagram

An electronic digital clock, as opposed to an analog clock using a mechanical fitting to indicate time occurrences, is a timepiece that displays the time digitally. Digital clocks are used in practically every aspect of our life and may be found in a variety of locations such as homes, hospitals, schools, and companies. So, in this article, we'll use the Atmel AT89C2051 controller to create a 4-bit Electronic  Digital Clock .

The Atmel AT89C2051 is an 8051-based Fully Static 24MHz CMOS controller with 15 I/O Lines, 2 Timers/Counters, 6 Interrupts/2 Priority Levels, Analog Comparator, LED Drive Outputs,  UART , Two-level Program Memory Lock, 2K Bytes  Flash Memory , 128 Bytes On-chip RAM.

Electronic Digital Clock using AT89C2051

The following is AT89C2051-24PU Flash Memory.

Programming the Flash Memory

Verifying the Flash Memory

The following figure is AT89C2051-24PU Flash Programming and Verification Waveforms.

Flash Programming and Verification Waveforms

• The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning.

The following figure is AT89C2051-24PU Package.

Package

Microchip Technology Inc. is a leading provider of microcontroller and analog semiconductors, delivering low-risk product development, reduced overall system cost, and faster time to market to thousands of customers across the world. Microchip, based in Chandler, Arizona, provides excellent technical support as well as consistent delivery and quality.