1. The commonly used crystal oscillator frequency of the microcontroller is 1.2M-12M. Generally, one machine cycle is 12 clock cycles, so when using 12M, one machine cycle is 1US, which is easy to calculate and has the highest speed. Of course, there are also microcontrollers with higher frequencies.
Keywords：MCU 12M 11 0592M
Reference address：MCU's choice of 12M and 11.0592M
You can find out by doing some calculation. For example, if we want to get a baud rate of 9600, the crystal oscillator is 11.0592M and 12M, timer 1 is mode 2, SMOD is set to 1, and see what the required TH1 value is.
Substitute into the formula:
Substitute into the formula:
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Microcontroller and Embedded Systems Bible
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