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The STC90C54RD+40I-LQFP44 is a microcontroller manufactured by STC Micro. Below are the factual specifications, descriptions, and features:

Specifications:

• Manufacturer: STC Micro
• Core: 8051-compatible
• Operating Frequency: Up to 40 MHz
• Program Memory (Flash): 54 KB
• RAM: 1.28 KB
• Data Flash (EEPROM): 2 KB
• Package: LQFP-44 (Low-profile Quad Flat Package)
• Operating Voltage: 3.3V - 5.5V
• Operating Temperature: -40°C to +85°C (Industrial grade)
• I/O Pins: 36 (General-purpose)
• Timers: 4 (16-bit)
• UARTs: 2
• ADC Channels: 8 (10-bit resolution)
• PWM Channels: 4
• Watchdog Timer: Yes
• ISP (In-System Programming): Supported

Descriptions:

The STC90C54RD+40I-LQFP44 is a high-performance 8051-based microcontroller with enhanced features, including a high-speed 40 MHz clock, 54 KB Flash memory, and 1.28 KB RAM. It supports ISP (In-System Programming) for easy firmware updates and includes 2 KB EEPROM for data storage. The LQFP-44 package makes it suitable for compact embedded applications.

Features:

• 8051-compatible core with improved instruction execution speed
• Wide operating voltage (3.3V–5.5V)
• Low-power modes (Idle and Power-down)
• Hardware watchdog timer for system reliability
• Multiple communication interfaces (UART, SPI, I²C)
• 8-channel 10-bit ADC for analog signal processing
• 4-channel PWM for motor/dimming control
• Industrial-grade temperature range (-40°C to +85°C)
• High noise immunity for robust operation

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