01
I believe many people started learning about microcontrollers from here, right?
Of course, the AT89C51 is rarely used now. However, another brand of the 51 microcontroller is still very popular, which is the STC, a microcontroller from Holtek.
Not only has the speed improved, but the peripherals have also become rich, and more importantly, the price is still very low!
It is understood that the cheapest SOP8 microcontroller costs less than one yuan! With such a low price, can you resist?
However, this requires a certain minimum order quantity. If you only want to buy a few or dozens for fun, you might as well go to Taobao, as it won’t cost much.
Of course, this 51 microcontroller is still 8-bit, and no matter how fast it is, it won’t go much faster, but it can still do many things and complete many projects. Here, let’s not compare it with the STM32.
This type of microcontroller is suitable for products that are not very complex but have a very large quantity, mainly due to low cost. Just think about it, saving 0.1 yuan on a chip means saving a lot of money on 1 million pieces, which is enough to buy a license plate in downtown Shanghai
Moreover, the 51 core is so widely used that you cannot imagine; some people have even found the 51 core in the control circuit of CD drives, and the rest you can figure out yourself~
02
Next, let’s talk about another 8-bit microcontroller, which is a product from Atmel’s AVR.
Actually, I don’t want to directly say AVR; I want to mention Arduino. Most of Arduino’s products use AVR microcontrollers as processors, and some products even have two AVR MCUs at the same time.
For example, the UNOR3 uses a mega16U2 as the USB interface chip and a mega328p as the main control chip. Looking at Arduino’s annual sales, we can see how popular AVR microcontrollers are.
03
Next, let’s talk about low-power MCUs.
When it comes to low power, I believe everyone immediately thinks of MSP430. No reason, just power saving!
However, I am not familiar with MSP430, so I won’t say much here. I have seen some design solutions for instruments, many of which use MSP430.
First, let me show you two images:
In fact, the MSP432 is a high-performance low-power product that was launched recently.
Nowadays, there are more and more low-power products, and many companies are doing very well in this area, such as ST’s STM32L series.
In fact, this product has very low power consumption.
Next, let’s look at the applications.
The following image is an introduction to Huawei’s Honor Band, which uses the STM32F4. If products like fitness bands, which have high power consumption requirements, can use it, it is enough to show that its power consumption is indeed low.
And here is an introduction after disassembly:
As well as the mainboard of the Apple Pencil:
The above images show that both of Apple’s products use the STM32L series MCUs, which indicates their low power consumption.
04
Next, let’s talk about the most powerful, most widely used, and most popular MCU—STM32.
As shown in the image below, the F1 series alone includes five product lines:
In fact, STM32 has many series, with so many types that they can meet the vast majority of needs, and they are rich in resources and easy to use.
05
In addition, the only other series I can think of is the AT91 series. Currently, most Jlink debuggers use AT91 series chips.
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