Interfacing the 74HC595 shift registers with PIC16F887 digital pins

The 74HC595 shift registers is a serial in parallel out shift register type. We just use three digital pins to send the data the register. Using these three wires could drive multiple of this IC.

For more detail about 74HC595, please see this post.

In this example I use two registers to show a timing of 60 seconds.

Schematic diagram

Source code is here:

A screen shot while the simulation shows 17 seconds count.

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