Michael Silverman documenting innovation at work


Shift Registers: Serial In, Parallel Out

Schematic for 16 bit output

In this article I will examine Serial In Parallel Out (SIPO) shift registers. These are very useful for microcontroller projects. This type of register allows you to turn three output pins into as many as you would like. I will explain the theory behind the registers and give an actual implementation. As a working example we want to drive 16 pins for a clock application using as few pins on the microcontroller as possible.