Most AVR microcontrollers have PWM hardware. Today, I will explore whether the square wave generated by PWM or precise delay is more accurate. Welcome to discuss.
The editor takes the output of 4KHz square wave as an example
1. The following figure shows the 4K square wave output by the editor using PWM
From the figure, we can see that the frequency of PWM output is 4.03KHz;
2. Below is the output graph of the precise delay (the precise delay used by the editor is the cycles function in intrinsic.h in the IAR compiler)
From the figure we can see that the frequency of the precise delay is 4.01KHz, and it is in a state of jumping to 4KHz
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