Preface

  Record the process of learning the principle of single chip microcomputer . The specific courses I took were app( University of China mooc) I found Professor Dai Shenghua from Beijing Jiaotong University on the 《 Principle and application of single chip microcomputer 》. If you have time, you can find your own learning video . I think it's very good . Here are some notes I learned by myself .
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One ：51 The main function block diagram of single chip microcomputer

Single chip system Include the following parts ：

1. Clock source ： Provide a stable clock for the single chip microcomputer
2. processor ： Used to calculate The core of our whole MCU .
3. Memory ： Store program code and data ROM( read-only )
4. interrupt ： Used to interrupt program execution
5. Bus: Address data Control bus
6. Counter / Timer ： For counting and delay .
7. I/O mouth Serial port ： Used for control and communication .

Two ：51 Memory structure of single chip microcomputer

The maximum storage space of program memory and data memory is ： The maximum space is 2^32bit = 64KB
Internal data storage ：
External data storage ：

The data and address in the address ：
We can think of it as a tall building , Each floor of the tall building has an address , What is stored in each floor is the data in the address .

3、 ... and ：51 Timing of single chip microcomputer / Logic structure diagram of counter （ Mode one ）

Timing and counter It is realized by counting .
Here is a fosc It's the source of the clock .
When the counter overflows will TF1 Set up 1 了 Thus entering the interrupt .

Four ：51 MCU interrupt system structure diagram

Interrupts are used to interrupt the sequential execution of programs .

5、 ... and ：51 Extended off chip program and data memory of single chip microcomputer

PSEN : Program memory Read through this Because it's read-only
RD/WR ： Data storage Through a readable and writable bus

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