The minimum system of a microcontroller includes: 1. Power supply; 2. Crystal oscillator circuit; 3. Reset circuit; The minimum system is also the minimum application system, which refers to a system that can work with a microcontroller composed of the fewest components.
The minimum system of a single-chip microcomputer is also the minimum application system. It refers to a system that can work with a single-chip computer composed of the fewest components. So what does the minimum system of this single-chip computer include? ? The most common 51 microcontroller includes the following three parts:
1. Power supply: 1 5V DC power supply
2. Crystal oscillator circuit: The typical crystal oscillator is 11.0592MHz (because it can accurately It can obtain 9600 baud rate and 19200 baud rate for occasions with serial communication)/12MHz (generating accurate uS-level time intervals to facilitate timing operations).
3. Reset circuit: It is composed of a capacitor connected in series with a resistor. From the figure and the property that "the capacitor voltage cannot mutate", we can know that when the system is powered on, the RST pin will appear at a high level, and, The duration of this high level is determined by the RC value of the circuit. Capacitors generally use 10~30uF.
After these three parts are built, the microcontroller can be run.
After running, you can use the control port of the microcontroller to control other things.
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