Development and Advantages of MCU Development Board at Home and Abroad

What is the MCU development board? In short, it refers to the integration of many single-chip peripheral devices, such as LED lights, digital tubes, buttons, determinant buttons, stepper motors, servo motors, liquid crystal displays, etc. The board used for experiments, development, etc. is an experimental device (single-chip programming).

The MCU development board is a single-chip microcomputer used in the design and development of the product before the mass production of the product. When we have a certain foundation for the study of theoretical knowledge, the MCU development board is our practical tool (pIC MCU), through the MCU. Development Boards We can do some experiments to master what we have learned. In practical applications, the MCU development board has the following advantages:

(1) Using a single-chip development board, you can program different programs to achieve a variety of functions, without soldering a board for an experiment.

(2) Designed on the MCU board, debugging the program, it can be easily transplanted to the product, but sometimes it is necessary to make appropriate modifications, such as port settings, because the board of the development board and the product cannot be completely Consistent.

(3) The use of the MCU development board saves a lot of resources and improves our learning efficiency. It provides a good platform for us to learn MCU better.

In order to let everyone have a deeper understanding of the MCU development board, below, Xiaobian will summarize the basic knowledge of the development and types of MCU development boards.

Now it can be said that it is the MCU's Warring States period. The world's major chip manufacturing companies have introduced their own single-chip microcomputers, ranging from 8 bits, 16 bits to 32 bits. There are countless, everything is compatible with the mainstream C51 series, and there are also incompatibility. But they have their own characteristics and complement each other, providing a broad world for the application of single-chip microcomputer. Looking at the development process of single-chip microcomputer, it can predict the development trend of single-chip microcomputer, and there are roughly:

1, low power CMOS

The power consumption of the 8021 of the MCS-51 series is 630mW, and the current MCUs are generally around 100mW. With the lower and lower power requirements of the MCU, the current MCU manufacturers have basically adopted CMOS (complementary metal). Oxide semiconductor process). Like 80C51, HMOS (high-density metal oxide semiconductor process) and CHMOS (complementary high-density metal oxide semiconductor process) are used. Although CMOS consumes less power, its work is determined by its physical characteristics. The speed is not high enough, and CHMOS has the characteristics of high speed and low power consumption. These features are more suitable for applications requiring low power consumption like battery power. Therefore, this process will be the main way to develop microcontrollers in the future.

2, micro-single

Nowadays, conventional MCUs generally integrate a central processing unit (CPU), random access data storage (RAM), read-only program memory (ROM), parallel and serial communication interfaces, interrupt systems, timing circuits, and clock circuits. On a single chip, the enhanced microcontroller integrates such as A/D converter, PMW (pulse width modulation circuit), WDT (watchdog), and some microcontrollers integrate LCD (liquid crystal) driver circuits on a single chip. In this way, the MCU contains more unit circuits and more powerful functions. Even MCU manufacturers can customize the MCU chips with their own characteristics according to the requirements of the users. In addition, the current products generally require small size and light weight. This requires that the MCU requires a small size in addition to its high function and low power consumption. Many of the MCUs today have a variety of package formats, of which SMD (Surface Package) is becoming more and more popular, making the system composed of MCUs positive. Development towards miniaturization.

3, the mainstream and multiple varieties coexist

Although there are many kinds of single-chip microcomputers, each with its own characteristics, the 80C51-based single-chip microcomputer is the mainstream. Compatible with its structure and command system, there are PHILIPS products, ATMEL products and Taiwanese Winbond series MCUs. So C8051 is The core MCUs account for half of the total. MicroChip's PIC Reduced Instruction Set (RISC) also has a strong momentum of development. The Taiwanese HOLTEK company's MCU production has increased in recent years, and its market share is lower than its low price and high quality. In addition, there are products of MOTOROLA, special-purpose single-chip microcomputers of several major companies in Japan. In a certain period of time, this situation will continue, there will be no monopoly situation in which a single-chip computer dominates the world, and it depends on complementarity and complement each other. The path of common development.

The MCU development board is a single-chip experimental device for learning 51, STC, AVR models. According to the model used by the single-chip microcomputer, there are 51 single-chip development board, STC single-chip development board, AVR single-chip development board, pic single-chip development board.

(1) 51 series MCU development board

51 MCU is a multi-chip computer currently used on the market. The TX-1B MCU development board fully supports the 51 series MCU. For the S series 51 MCU, the online download program can be downloaded. The development board and the computer are connected with the download cable provided with the product kit. Connected, you can download the program directly according to the operation tutorial.

(2) STC series MCU development board

STC MCU is a very cost-effective MCU, it is fully compatible with MSC-51 series MCU, in addition to its own many features, such as: can not decrypt, low power, high speed, high reliability, strong anti-static, strong Anti-jamming, etc.

Secondly, the internal resources of STC MCU are much richer than those of MSC-51 series MCU. It has 1280 bytes of SRAM, 8-64K bytes of internal program memory, and 2-8K bytes of ISP boot code, except P0-. P3 port also has more P4 port (PLCC package), the chip comes with AD (AD series), the chip comes with EEPROM, the film machine comes with a watchdog, double data pointer and so on.

At present, the occupancy rate of STC series single-chip microcomputers in the domestic market is increasing day by day. TX-1B type MCU development board can be used as the development board of STC series MCU, which is programmed in assembly language or C language, when it is used as STC MCU experiment board. Connect the development board directly to the computer with the serial cable included with the product kit. Follow the tutorial to download the program, and the download speed is much faster than other download tools.

(3) AVR series MCU development board

The advantages of the AVR series MCU development board are as follows:

1, fast. The speed can reach 1MIPS/sec, which is theoretically 12 times that of the traditional 51.

2, on-chip resources, including: Boot code area, 16K Flash, 512-byte EEPROM, 1K SRAM, JTAG interface, emulation and download, support ISP download, 3 timers with PWM, 8-channel 10-bit AD converter, UART (asynchronous serial port), SPI (synchronous serial port), watchdog, TWI (IIC) interface, analog comparator, 32 general purpose I/O ports.

3. Strong driving ability. The I/O port can directly drive digital tubes, LEDs, relays and other devices.

4. Low power consumption. Although the low power consumption is not comparable to the 430 microcontroller, it is also a leader in the microcontroller.

5, a variety of models can be selected, a variety of different models can meet different needs.

6, cost-effective. Under the premise of high performance, the price of the chip is not increased, the price can be compared with 51, and the function is much stronger than the 51.

7. Confidentiality is good. When developing a product, it is difficult to decrypt it.

The MCU development board is actually a multi-functional experiment board, which is a good helper for learning MCU and developing MCU products. This paper mainly introduces the development and types of MCU development boards at home and abroad, as well as the basic knowledge and application advantages of 51 MCU development board, STC MCU development board and AVR MCU development board.