"Asynchronous" because the CD4021B is doing all this data collection at its own pace without coordinating with the Arduino. "Parallel" because it is all at once, like hearing a musical cord. "Input" because you are collecting information. This is called Asynchronous Parallel Input. This means you can read the state of up to 8 digital inputs attached to the register all at once. Using a parallel to serial shift register you can collect information from 8 or more switches while only using 3 of the pins on your Arduino.Īn example of a parallel to serial register is the CD4021B, sometimes referred to as an 8-Stage Static Shift Register. Sometimes you'll end up needing more digital input than there are pins on your Arduino. Parallel to Serial Shifting-In with a CD4021BE Shifting In & the CD4021B
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