I had learned an article about 74HC595N Shift Register, and I would like to know
What is the function of 74HC595N ?
it's written in the doc: serial shifting
The 74HC/HCT595 is an 8-stage serial shift register with a storage register and 3-state outputs
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Hi,
It is used to take serial data input and output that data as parallel.
This makes it convenient when I/O pins are at a premium on your controller.
You use 3 I/O pins on your controller to output to 8 I/O on the 595.
595's can be daisy chained so the same 3 pins can output to 8 ,16, 24, 32 I/O.
For example;
Tom... 
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thanks a lot ! 