Introduction to single-chip microcomputer 51 The difference between single-chip microcomputer and STM32 single-chip microcomputer and the comparison of DSP, AVR and single-chip microcomputer

Introduction to MCU

51 MCU and STM32 MCU

The 51 single-chip microcomputer is the collective name for all the single-chip microcomputers compatible with the Intel 8031 ​​instruction system. The ancestor of this series of single-chip microcomputers is Intel's 8031 ​​single-chip microcomputer. Later, with the development of flash ROM technology, 8031 ​​single-chip microcomputer has made considerable progress and become the most widely used 8bit One of the microcontrollers, his representative model is the AT89 series of ATMEL.

The STM32 microcontroller is a 32bit series microcontroller produced by ST (STMicroelectronics) using arm's cortex-M as the core. Its internal resources (registers and peripheral functions) are much more than 8051, AVR and PIC. It is basically close to the CPU of a computer, suitable for mobile phones, routers and so on.

The difference between DSP, AVR and PIC microcontroller, 8051 microcontroller

Both AVR and PIC are 8-bit microcontrollers that are different from the 8051 microcontroller. Because of their different structures, their assembly instructions are also different. They both use the RISC instruction set, with only dozens of instructions. Most of them are Single-cycle instructions, so under the same crystal frequency, faster than 8051.

DSP is actually a special kind of single-chip microcomputer, which ranges from 8bit to 32bit. It is specially used to calculate digital signals. In some calculation formulas, it is even faster than the fastest CPU of current home computers. For example, a 32-bit DSP can complete the calculation of a 32-bit number multiplied by a 32-bit number plus a 32-bit number in one instruction cycle.

8051, 8031, 89C51 and 89S51 relationship

We usually talk about 8051. What is 8031? Now there are 89C51 and 89s51. What is the relationship between them?

MCS51 refers to the general name of a series of single-chip microcomputers produced by the American INTEL company. This series of single-chip microcomputers includes many varieties, such as 8031, 8051, 8751, 8032, 8052, 8752, etc., among which 8051 is the earliest and most typical product, and the others in this series The single-chip microcomputer is based on the 8051 by adding, subtracting, and changing its functions, so people are accustomed to using the 8051 to call the MCS51 series of single-chip microcomputers. The 8031 ​​is the most popular single-chip microcomputer in China in the past few years, so it will be seen on many occasions. To the 8031 ​​name. INTEL has licensed (sold) the core technology of MCS51 to many other companies, so many companies are making 8051-core microcontrollers. Of course, the functions are more or less changed to meet different needs. 89C51 is this. A microcontroller that has been very popular in our country in recent years. As for the many AT series single-chip microcomputers used in China, it is actually a series of single-chip microcomputers that ATMEL has added other functions to the 8031 ​​core.

Here is a supplementary explanation. The first single-chip microcomputer that appeared first was actually Intel’s 8031 ​​single-chip microcomputer. It was the originator of the single-chip microcomputer, but it did not have an internal program memory. Later, with the development of flash ROM technology, there appeared to be able to store programs. 8051 series MCU