I think all friends should know that the basic law of learning is: from easy to difficult

I think all friends should know that the basic law of learning is ： From easy to difficult . No matter what we learn 、 Experience and skills , We should follow this rule , otherwise , The consequence of aiming too high is ： Or face difficulties , Choose to give up , perhaps , Start over again .

STC SCM and STM32 SCM compared with , It has the following advantages ：

(1)STC The internal structure of single-chip microcomputer is better than STM32 Single chip microcomputer is simple , It is convenient for beginners to understand the classic structure of MCU . although STC SCM and STM32 Single chip computers are all Harvard computer structures , however ,STC The internal structure of single chip microcomputer is relatively , It's simpler .

(2)STC The number ratio of single-chip registers STM32 SCM is much less .STC There are only dozens of registers in the single chip microcomputer , But STM32 There are hundreds of registers of single chip microcomputer . The two are not in the same order of magnitude . because MCS-51、Cortex-M3、Cortex-M4、Cortex-A9、Cortex-A73 perhaps MIPS Etc. MCU core and on-chip and off-chip devices , All of them realize specific functions through program operation registers , therefore , There are only dozens of registers STC Single chip microcomputer , Relatively speaking , It is easier for beginners to get started .

The article is relatively long , More words , You can first open the avatar and pay attention to me , Then take your time ,/// Insert a ： At the beginning of this year, I recorded a set of systematic introductory single chip microcomputer tutorial , If you want, just ask me for it. It's free , I can send a private message ~ Click the black font in the lower left corner of my avatar and I can also get it . I've been relatively idle recently , Take me to finish the design , Take students to provincial or above competitions ///

(3)STC Single chip microcomputer adopts MCS-51 Instruction set , Its assembly instructions are more than 100 , Than STM32 A lot less . Relatively few assembly instruction sets , It can enable beginners to understand the function of the assembly instructions of the operation processor relatively quickly 、 The relationship between architecture and computer architecture .

(4) Latest version STC8 Series MCU has the characteristics of convenient downloading program and being an emulator itself , Save capital investment for beginners in electronic product design technology , Learning and developing technology is convenient and fast .STM32 Need to buy independent Jlink Only the simulator can simulate .

(5)STC SCM has a relatively simple classic architecture , So that beginners do not have to spend too much energy on their hardware itself , You can concentrate on mastering the basic language of any subsequent type of MCU development ：C Language . meanwhile , You can also master the basic design ideas of electronic products 、 Experience and skills .

therefore , in summary , According to our learning rules from shallow to deep and from easy to difficult ： Engineers and college and technical secondary school students who are beginning to learn electronic product development technology , You should first learn and master the use STC The skills of developing electronic products by single chip microcomputer . This is a basic skill .

STC Single chip microcomputer

Speaking of STC Some people will talk about SCM ,STC It's mainstream , I think it's going to be sprayed ~~ We are based on it is a relatively good single-chip computer in China .STC Single chip microcomputer is a single clock produced by macro crystal / machine Single chip microcomputer of cycle , To put it bluntly STC SCM is 51 And AVR The combination of , Some people say AVR yes 51 Instead of MCU , however AVR MCU in place control and C There is a big difference in language writing .

and STC The single-chip computer is combined with 51 and AVR The advantages of , Although the function is not as good as AVR So powerful , But in AVR Functions that can be found , stay STC Basically, there are , meanwhile STC SCM is 51 kernel , This gives 51 The single chip computer provides great convenience for the engineers , It saves learning AVR Time for , At the same time AVR Various functions of …

STC MCU is high speed 、 Low power Consumption 、 A new generation of super anti-interference 8051 Single chip microcomputer 51 Single chip microcomputer , The instruction code is completely compatible with the traditional 8051, But fast 8~12 times , Internal integration MAX810 Special reset circuit .4 road PWM 8 Highway 10 position A、D transformation , For electric motors Supplier control , Strong interference occasion , To become a successor 51 A new series of single-chip microcomputer after single-chip microcomputer …

characteristic ：

1. Download burning program with serial port convenient to use , Easy to use , Have a lot of learning materials and videos , The most famous

The video that belongs to Mr. Du , A lot of friends who are interested in SCM are introduced through this video , At the same time, it has wide voltage ：5.5～3.8V,2.4～3.8V, Low power design ： Idle mode , Power down mode （ Can be awakened by an external interrupt ）

2. STC SCM has application programming , Debugging is more convenient ; with 10 position AD、 Inside EEPROM、

Can be found in 1T/ Work under machine cycle , Speed is traditional 51 Single chip microcomputer 8~12 times , The price is cheaper

3. 4 Channel capture / Comparison unit ,STC12C2052AD The series is 2 passageway , It can also be used to realize 4 A timer or 4 External interrupts ,2 A hardware 16 Bit timer , Compatible with common 8051 The timing of device .4 road PCA It can be realized again 4 A timer , With hardware watchdog 、 High speed SPI Communication port 、 Full duplex asynchronous serial port , Compatible with common 8051 Serial port , It also has advanced instruction set structure , and Allow ordinary 8051 Instruction set

PS：

STC Although the function of MCU is not as good as AVR、STM32 Powerful , The price is not as good as 51 and ST32 cheap , But it doesn't matter , What's important is that it belongs to the excellent single chip microcomputer made in China , I hope the home-made single-chip microcomputer can make a long journey …

The most used devices ：STC12C2052AD

AVR Single chip microcomputer

AVR SCM is Atmel The company launched a relatively new single chip computer , Its outstanding feature is high performance 、 high velocity 、 low power consumption . It cancels machine cycles , Take the clock cycle as the instruction cycle , Carry out flow operation . AVR Single chip instructions are in words , And most of the instructions are single cycle instructions . The single cycle can execute the function of this instruction , At the same time, read the next instruction . Usually the clock frequency is 4～8MHz, Therefore, it is the shortest The instruction execution time is 250～125ns.AVR Single chip computer can become a hot single chip computer recently , Main features ：

characteristic ：

1. AVR There is no such accumulator in the series A Structure , It is mainly through R16～R31 Register to achieve A The function of . stay AVR in , Didn't like 51 Series data pointer DPTR, But by the X（ from R26、R27 form ）、Y（ from R28、R29 form ）、Z（ from R30、R31 form ） Three 16 Bit register to complete the function of data pointer （ It's equivalent to three groups DPTR）, and It can also be used for later increment or first decrement , And in the 51 In the series , All logical operations must be in A In the middle of ; and AVR But it can be done between any two registers , There is no need for A Back and forth in , these All ratio 51 The series is better

2. AVR The special registers of are set in 00～3F Address range , No need for image PIC In that case, the process of selecting storage must be carried out first , Compared with PIC convenient .AVR In slice RAM The address range of is 0～00DF（AT90S2313） and 0060～025F（AT90S8515、AT90S8535）, They take up the address of the data space , In these films RAM Just for storing data , Generally, there is no general mail Functions of memory . When the program is complex , General registers R0～R31 It's not enough ; and 51 Series of general registers up to 128 individual （ by AVR Of 4 times ）, It doesn't feel like this when programming .

3.AVR Of I/O Feet similar PIC, It also has a direction register to control the input or output , In the output state , The high level output current is 10mA about , Low level suction current 20mA. This is not as good as PIC, But more than 51 The series should be excellent …

shortcoming ：

1. There is no bit operation , It controls and judges related register bits in byte form

2. C Language and 51 Of C There are great differences in the way languages are written , Let's learn from the beginning 51 A friend of MCU is not used to it

3. The general registers are 32 individual （R0～R31）, front 16 A register （R0～R15） Can't deal with immediate numbers directly , As a result, universality has declined . And in the 51 In the series , All its general registers （ Address 00～7FH） Can deal with immediate number directly , Obviously better than the former .

The most used devices ：ATUC64L3U、ATxmega64A1U、AT90S8515

Friends interested in MCU can come to me , I recorded some introductory tutorials about MCU , If you need children's shoes, just ask me for them , Free of charge , Private confidence in me “ Miss Lin ” You can take ～ Click to open my avatar to receive