Intel 8031 & 8051 Microcontrollers

The **8031** and **8051** microcontrollers are among the most widely used 8-bit MCUs, originally developed by Intel. The 8051 series has become an industry standard, with multiple manufacturers producing compatible devices.

Key Features

• 8-bit CPU with Harvard architecture
• 4KB ROM (8051) / External ROM (8031)
• 128 bytes RAM
• 32 I/O lines (4 ports)
• Two 16-bit timers/counters
• UART serial communication
• Interrupt system with 5 sources

Comparison Table

Model	ROM	RAM	I/O Ports	Timers	Serial
8031	External Only	128B	32	2	Yes
8051	4KB	128B	32	2	Yes

Applications

The 8051 family is widely used in embedded systems, automation, automotive control, industrial controllers, and consumer electronics.