Lec-2: Introduction to 8085 Microprocessor

Summary

This video provides an in-depth introduction to the 8085 microprocessor, designed by Intel and released in 1976. The 8085 is an 8-bit microprocessor, offering improvements over its predecessor, the 8080, such as reduced power consumption and higher processing speed. The video explains its features, including a 40-pin configuration, 3 MHz operating frequency, and 64 KB memory addressing capability. The 8085 supports interrupt handling and serial communication, making it versatile for applications like personal computers, video game consoles, and scientific calculators. It also covers the microprocessor's technical aspects, including the address and data buses, and provides insights into different versions of the 8085.

Takeaways

• 😀 The 8085 microprocessor was designed by Intel and introduced in March 1976 as an 8-bit microprocessor.
• 😀 The 8085 microprocessor is an 8-bit processor, which means its data bus has 8-bit width, as opposed to 16-bit processors like the 8086.
• 😀 The 8085 microprocessor includes extra instructions for handling interrupts, such as setting or reading interrupt masks.
• 😀 Interrupts allow the CPU to prioritize certain tasks when hardware or software issues arise, similar to emergency responses at a police station.
• 😀 The 8085 processor operates at a maximum frequency of 3 MHz, which is significantly faster compared to its predecessor, the 8080.
• 😀 Unlike the 8080, the 8085 uses a 5V power supply, whereas the 8080 required a higher power supply.
• 😀 The 8085 features a 16-bit address bus, enabling it to access a memory range of 64KB, which is a significant upgrade from earlier models.
• 😀 The 8085 microprocessor found widespread use in personal computers, video game consoles, and scientific calculators up until 2000.
• 😀 The 8085 has 40 pins, a notable point often queried in exams or interviews. Understanding these pins and their functions is crucial for the hardware aspect of the processor.
• 😀 The processor’s design allows it to interface with memory locations up to 64KB, providing considerable memory management capabilities for its time.

Q & A

What is the 8085 microprocessor, and who designed it?

The 8085 microprocessor is an 8-bit processor designed by Intel. It was introduced in March 1976.

What is the significance of the data bus size in the 8085 microprocessor?

The data bus size in the 8085 microprocessor is 8 bits. This defines the amount of data that can be processed at one time.

How does the 8085 microprocessor differ from the 8080?

The 8085 is a modified version of the 8080 with additional instructions like 'set interrupt mask' and 'read interrupt mask'. It also improved features like lower power consumption and higher speed.

What types of interrupts are supported by the 8085 microprocessor?

The 8085 supports multiple types of interrupts, allowing the processor to respond to hardware or software issues, which is similar to how a police station responds to an emergency.

What are some of the applications of the 8085 microprocessor?

The 8085 was widely used in personal computers, video game consoles, and scientific calculators until the year 2000.

What is the power supply voltage for the 8085 microprocessor?

The 8085 microprocessor operates with a 5-volt power supply.

What is the clock frequency of the 8085 microprocessor?

The 8085 microprocessor operates at a frequency of 3 MHz, meaning each clock cycle takes 1/3 microseconds.

How many pins does the 8085 microprocessor have?

The 8085 microprocessor is a 40-pin integrated circuit device.

What is the significance of the 8085's address bus size?

The 8085 has a 16-bit address bus, meaning it can reference up to 2^16 memory locations, or 64KB of memory.

What are the differences in memory addressing between a 3-bit and 16-bit address bus?

A 3-bit address bus can reference 8 memory locations, while a 16-bit address bus can reference 64,000+ memory locations, making it capable of handling larger amounts of memory.