51 single chip microcomputer advantages and disadvantages and application areas introduction

One, 51 single chip microcomputer

The most widely used 8-bit single-chip microcomputer is of course also the easiest single-chip microcomputer for beginners to learn. It was first introduced by Intel. Due to its typical structure and complete centralized management of bus dedicated registers, numerous logical bit operation functions and rich control-oriented The command system can be called a generation of "classic", laying the foundation for the development of other single-chip microcomputers in the future.

51 single chip microcomputer advantages and disadvantages and application areas introduction

The 51 single-chip microcomputer has become a classic and an easy-to-use single-chip microcomputer mainly has the following characteristics:

characteristic

1. From the internal hardware to the software, there is a complete set of bitwise operating systems called bit processors. The processing objects are not words or bytes but bits. It can not only process a bit of some special function registers on the chip, such as transfer, set, clear, test, etc., but also perform bit logic operations. Its functions are very complete and easy to use.

2. At the same time, a dual-function address interval is specially opened in the on-chip RAM interval, which is extremely flexible to use. This function undoubtedly provides users with great convenience.

3. Multiplication and division instructions, which also bring convenience to programming. Many 8-bit single-chip microcomputers do not have the multiplication function. When doing multiplication, a subroutine call must be compiled, which is very inconvenient.

Disadvantage

(Although it is a classic, the shortcomings are still obvious)

1. Functions such as AD and EEPROM need to be expanded, which increases the burden of hardware and software

2. Although the I/O pins are simple to use, they have no output capability at high levels. This is also the biggest weakness of the 51 series of MCUs.

3. The running speed is too slow, especially the double data pointer, if it can be improved, it can bring great convenience to programming

4. 51 single-chip microcomputer has poor protection ability, and it is easy to burn the chip

Application range: At present, it is widely used in teaching occasions and occasions where performance requirements are not high.

Most used devices: 8051, 80C51

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