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The STC89C54RD+40I is a microcontroller manufactured by STC Micro (STC). Below are its key specifications, descriptions, and features:

Manufacturer:

STC Micro (STC)

Specifications:

• Core: 8051-based
• Operating Voltage: 3.3V - 5.5V
• Clock Speed: Up to 40 MHz
• Flash Memory: 16 KB (expandable via external memory)
• RAM: 1280 bytes
• EEPROM: 16 KB (for data storage)
• I/O Ports: 32 (4 x 8-bit ports)
• Timers/Counters: 3 (Timer 0, Timer 1, Timer 2)
• UART: 1 (Serial communication)
• Interrupt Sources: 8
• Power Modes: Idle and Power-down modes for low power consumption
• Operating Temperature: -40°C to +85°C (Industrial grade)
• Package: PDIP-40, PLCC-44, or LQFP-44

Descriptions:

• The STC89C54RD+40I is an enhanced 8051-compatible microcontroller with in-system programmable (ISP) flash memory.
• It supports external memory expansion up to 64 KB.
• Designed for industrial applications with a wide operating voltage range and extended temperature tolerance.
• Features low EMI (Electromagnetic Interference) and high noise immunity.

Features:

• High-speed 8051 core with single-clock cycle execution.
• 16 KB ISP Flash for program storage.
• 16 KB EEPROM for non-volatile data storage.
• Three 16-bit timers/counters for precise timing operations.
• Built-in watchdog timer for system reliability.
• Power-saving modes (Idle and Power-down) for energy-efficient applications.
• Industrial-grade temperature range (-40°C to +85°C).
• Multiple package options (PDIP-40, PLCC-44, LQFP-44).

This microcontroller is commonly used in industrial control systems, embedded applications, and consumer electronics requiring high reliability and performance.