1) Reset the system:
When pin 9 appears high for more than 2 machine cycles, the microcontroller is reset and the program runs from the beginning.
2) Clock system:
The oscillator circuit generates a frequency equal to the crystal frequency, and an external crystal oscillator is used at this time.
It can also be input separately from the outside. At this time, the XTAL2 pin is grounded, and the clock signal is input by Xtal21.
3) Power supply system:
VCC, GND pin, power supply voltage 4-5.5V. 。
Aging pin of the program:
Flash memory is programmed through serial ISP interface, and the burning of computer and single chip microcomputer is completed through special burning software such as AVR_fighter for u *** asp.
Question 2: What does the minimum system of single chip microcomputer mean? A basic application system consisting of clock circuit, reset circuit and power supply connected outside the chip is called the minimum system of single chip microcomputer.
Question 3: What is the smallest system of single chip microcomputer? ! ! ! For single chip microcomputer with reset circuit and oscillator, the minimum system is only Vcc and GND lines connected to power supply.
Without these, in addition to the power supply, you need complex circuits and external oscillators, such as crystal oscillators or crystals.
In short, the so-called minimum system of single chip microcomputer is the simplest circuit that can make single chip microcomputer run.
In order to make the single chip microcomputer run, three hardware conditions need to be met: power supply, reset and oscillation.
Question 4: The power drive of DC motor in the minimum system of single chip microcomputer is not enough.
Question 5: What is the minimum application system of single chip microcomputer? The following is the circuit diagram of the minimum system of single chip microcomputer. Includes three parts:
One: The part coming out from the ninth foot is called the reset circuit.
Two: The 18, 9 pins are connected to the circuit of the single-chip microcomputer oscillation frequency.
Three: the twentieth and fortieth needles are connected to the power supply, and the other needle leads to terror from the thirty-first needle.
The positive pole of the power supply is to let the single chip microcomputer use the memory.
In a word, the minimum system is the most basic condition for single chip microcomputer to work. The following circuit can make the single chip microcomputer work.
Question 6: What is the minimum system of single chip microcomputer? It is necessary for the operation of single chip microcomputer. Comprise a power supply circuit, a reset circuit, a crystal oscillator circuit and a singlechip.
Question 7:5 1 What are the components of the minimum system of single chip microcomputer? 5 1 single chip microcomputer (such as stc), crystal oscillator and reset circuit can form the smallest system.
If you want to know more, it is suggested to use the experimental board of single chip microcomputer. You can refer to Wu Jianying's 5 1 single chip experimental board, which is not bad.
Question 8: The minimum system schematic diagram of 51single chip microcomputer is such a simple diagram. After Baidu, a lot of pictures came out. If you are lazy with such a simple diagram, I suggest you don't learn single chip microcomputer.