Are AVR microcontrollers obsolete?

　　Some beginners and even intermediate developers think that because ARM generally has higher performance than AVR, ARM will replace AVR, AVR will exit the stage of history, or MSP430 will replace 51 series MCU, or FPGA will replace all MCUs, etc. This view is wrong, because different MCUs have their own characteristics and advantages, and no MCU is perfect. The most suitable MCU should be used in different occasions to give full play to their respective strengths, and there is no possibility that ARM will dominate the world and replace all other models of MCUs. Just imagine, an electronic watch that originally cost more than ten yuan is sold for hundreds of yuan because it uses ARM control. Who can bear it? Therefore, don't think that AVR is outdated and you will directly learn ARM after learning 51, or think that learning 51 is useless and you will directly learn ARM, otherwise you will hit a wall.

　　MSP430 series microcontrollers: more suitable for robot development, it is a 16-bit, ultra-low power mixed signal processor with a reduced instruction set launched by Texas Instruments in the United States. It has Flash memory, many interrupt sources, and can be nested arbitrarily, which is flexible and convenient to use. The power supply voltage of the MSP430 series microcontrollers uses a voltage of 1.8~3.6V. Therefore, when it runs under the clock condition of 1MHz, the current of the chip will be around 200~400uA, and the minimum power consumption in the clock shutdown mode is only 0.1uA. Each member of the MSP430 series microcontrollers integrates a rich set of on-chip peripherals. They are different combinations of some peripheral modules such as watchdog, analog comparator, timer, serial port 0, 1, hardware multiplier, LCD driver, 10-bit/12-bit ADC, 16-bit Sigma-Delta AD, direct addressing module (DMA), IO port, basic timer (Basic Timer), etc. The MSP430 series of microcontrollers introduced JTAG technology, which not only makes the development tools simple, but also relatively inexpensive, and also allows online programming.

　　PIC microcontroller: It can be used for robot development. It is an 8-bit microcontroller with a wide range of products. It uses a reduced instruction set and has a good development environment. It has strong pin drive capabilities and can be directly connected to relays to control strong electricity. It has a built-in watchdog and has sleep and low power modes. Many of its performance is not as good as AVR and MSP430 series microcontrollers, but it is also widely used because of its special advantages.

　　Lingyang MCU: It is more suitable for robot development. It takes 16-bit computer as the core and integrates RAM, ROM and other rich functional circuits of different sizes. Users can choose Lingyang MCU with specific functional circuits according to their needs. Lingyang MCU instruction system provides 16-bit and 16-bit multiplication and inner product operation instructions with high computing speed, and adds DSP function to its application. Therefore, Lingyang is suitable for speech recognition. Lingyang MCU is more common in schools in my country, and there are many application examples. It can be used as a MCU for robot enthusiasts.