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The STC90C52RC-40I is a microcontroller manufactured by STC Micro (STC). Below are its factual specifications, descriptions, and features:

Manufacturer:

STC Micro (STC)

Specifications:

• Core: 8051-compatible
• Operating Frequency: Up to 40 MHz
• Flash Memory: 8 KB (reprogrammable)
• RAM: 512 bytes
• EEPROM: None (external EEPROM may be required)
• Timers: 3 (Timer 0, Timer 1, and Timer 2)
• I/O Pins: 32 (4 ports: P0, P1, P2, P3)
• UART: 1 (serial communication)
• Interrupts: 6 (2 external, 3 timer-based, 1 serial)
• ADC: None (requires external ADC if needed)
• Operating Voltage: 3.3V – 5.5V
• Power Consumption: Low-power modes available
• Package: PDIP-40 (Plastic Dual In-line Package, 40 pins)
• Operating Temperature: -40°C to +85°C (Industrial grade)

Descriptions:

• The STC90C52RC-40I is an enhanced 8051-based microcontroller with in-system programmable (ISP) Flash memory.
• It is widely used in embedded systems, industrial control, and consumer electronics.
• Supports single-cycle instructions for improved performance compared to traditional 8051 MCUs.

Features:

• High-speed 8051 core (1T mode available for faster execution).
• ISP/IAP (In-System Programming/In-Application Programming) for easy firmware updates.
• Watchdog Timer (WDT) for system reliability.
• Power-down and idle modes for reduced power consumption.
• Strong anti-interference capability for industrial environments.
• Wide operating voltage range (compatible with 3.3V and 5V systems).

This microcontroller is commonly used in applications requiring low-cost, high-performance 8051-based control, such as smart home devices, motor control, and simple automation systems.

(Note: Always refer to the official STC datasheet for the most accurate and updated information.)