AT89C1051 Technical Summary

Overview

The AT89C1051 is a low-voltage, high-performance CMOS 8-bit microcontroller manufactured by Atmel. It features 1KB of Flash programmable and erasable read-only memory (PEROM), making it a versatile and cost-effective solution for embedded control applications. Built using Atmel's high-density nonvolatile memory technology, this microcontroller is fully compatible with the industry-standard MCS-51™ instruction set. The integration of an 8-bit CPU with Flash memory on a single chip provides a powerful yet flexible platform for a wide range of applications.

Features

• MCS-51™ Compatibility: Fully compatible with industry-standard MCS-51™ products.
• 1KB Flash Memory: Reprogrammable PEROM with 1,000 write/erase cycle endurance.
• Wide Operating Voltage: Operates from 2.7V to 6V, suitable for low-power applications.
• High-Speed Performance: Fully static operation supports clock frequencies from 0 Hz to 24 MHz.
• Memory Protection: Two-level program memory lock for secure code storage.
• On-Chip SRAM: 64 bytes of static RAM for data storage.
• Flexible I/O: 15 programmable I/O lines for interfacing with external devices.
• Timing Capabilities: One 16-bit timer/counter for precise timing operations.
• Interrupt Support: Three interrupt sources for responsive event handling.
• LED Drive Capability: Direct LED drive outputs simplify display interfacing.
• Analog Comparator: On-chip analog comparator for signal comparison tasks.
• Power Management: Low-power idle and power-down modes for energy-efficient operation.

Applications

The AT89C1051 is designed for a broad range of embedded control applications, including but not limited to:

• Consumer Electronics: Remote controls, toys, and small appliances.
• Industrial Control: Sensor interfacing, motor control, and automation systems.
• Automotive Systems: Simple control modules and dashboard displays.
• Medical Devices: Portable monitoring equipment and diagnostic tools.
• Communication Devices: Modems, routers, and peripheral controllers.
• Home Automation: Smart lighting, security systems, and HVAC controls.

Electrical Characteristics

Absolute Maximum Ratings

• Operating Voltage: 2.7V to 6V
• Storage Temperature: -65°C to +150°C
• Maximum I/O Pin Voltage: VCC + 0.5V
• Maximum Power Dissipation: 1W

DC Characteristics

• Input Low Voltage (VIL): -0.5V to 0.2VCC
• Input High Voltage (VIH): 0.7VCC to VCC + 0.5V
• Output Low Voltage (VOL): 0.45V (max) at 1.6mA
• Output High Voltage (VOH): VCC - 0.7V (min) at -60µA
• Power Supply Current (Active Mode): 10mA (typical) at 12MHz
• Power Supply Current (Idle Mode): 5mA (typical) at 12MHz
• Power Supply Current (Power-Down Mode): 50µA (typical)

AC Characteristics

• Clock Frequency: 0Hz to 24MHz
• Machine Cycle: 12 clock cycles (1µs at 12MHz)
• ALE Pulse Width: 100ns (min)
• Address Setup to ALE Falling: 50ns (min)
• Address Hold After ALE Falling: 50ns (min)

Package Information

Physical Dimensions

The AT89C1051 is available in a 20-pin Plastic Dual Inline Package (PDIP) and a 20-pin Plastic Leaded Chip Carrier (PLCC). Below are the key dimensions for the PDIP package:

• Package Type: 20-pin PDIP
• Length: 26.16mm (max)
• Width: 6.35mm (max)
• Height: 4.57mm (max)
• Lead Pitch: 2.54mm

Pin Configuration

The AT89C1051 features 20 pins, including power supply, ground, I/O ports, and control pins. Below is a brief overview of the pin functions:

• VCC (Pin 20): Power supply (+2.7V to +6V).
• GND (Pin 10): Ground reference.
• Port 1 (P1.0 to P1.7): 8-bit bidirectional I/O port with internal pull-ups.
• Port 3 (P3.0 to P3.7): 7-bit bidirectional I/O port with alternate functions (e.g., UART, interrupts, timer).
• RST (Pin 9): Reset input (active high).
• XTAL1 (Pin 5): Input to the inverting oscillator amplifier.
• XTAL2 (Pin 4): Output from the inverting oscillator amplifier.
• EA/VPP (Pin 19): External access enable/programming voltage input.

Conclusion

The AT89C1051 is a highly versatile and efficient 8-bit microcontroller, ideal for applications requiring low power consumption, compact design, and reliable performance. Its compatibility with the MCS-51™ instruction set, combined with features like Flash memory, programmable I/O, and power-saving modes, makes it a preferred choice for developers in various industries. Whether used in consumer electronics, industrial automation, or automotive systems, the AT89C1051 delivers a robust and cost-effective solution for embedded control needs.