What is a single chip microcomputer? What are the characteristics of a single chip microcomputer?

A working computer must have the following components: CPU (for calculation and control), RAM (data storage), ROM (program storage), and input/output devices (for example, serial port, parallel output port, etc.). In a personal computer, these components are divided into several chips and installed on a printed circuit board called a motherboard. In a single-chip microcomputer , all these components are integrated into an integrated circuit chip, so it is called a single-chip (single-chip) machine. In addition to the above components, some single-chip microcomputers also integrate other components such as A/D, D/A, etc. 

A single-chip microcomputer is a control chip, a microcomputer, and with a crystal oscillator, memory, address latch, logic gate, seven-segment decoder (display), button (similar to a keyboard), expansion chip, interface, etc., it is a single-chip microcomputer system. 

God! The CPU in a PC costs thousands of yuan. With so many things put together, it must be sold at a sky-high price! Besides, this chip must be very large. 

No, the price is not high, ranging from a few yuan to tens of yuan, and the size is not large, generally with 40 pins. Of course, some single-chip microcomputers with more functions also have more pins, such as 68 pins, and those with fewer functions only have more than 10 or more than 20 pins, and some even have only 8 pins. 

Why is this so? 

Functions are strong or weak. For example, some combination audio systems on the market only sell for a few hundred yuan, but some power amplifiers sell for several thousand yuan. In addition, the production volume of this chip is large, and the technology is also mature. The 51 series of single-chip microcomputers have been made for more than ten years, so the price is low. 

In this case, the function of the single-chip microcomputer must not be strong, so why should we learn it? 

This cannot be said. In actual work, not all occasions that require computers require computers to have high performance. Does a computer that controls the temperature of a refrigerator need to use PIII? The key to application is whether it is sufficient and whether it has a good performance-price ratio. Therefore, after more than ten years of being out, 8051 has not been eliminated and is still developing.