Hardware Reference
In-Depth Information
Communication,” you learned about serial transmission, which transmits 1 bit
of data at time. Shift registers allow you to easily convert between serial and
parallel data transmission techniques. This chapter focuses on serial-to-parallel
shift registers, sometimes called serial in, parallel out (SIPO) shift registers.
With these handy devices, you can “clock in” multiple bytes of data serially,
and output them from the shift register in a parallel fashion. You can also chain
together shift registers, and thus control hundreds of digital outputs from just
three Arduino I/O pins.
Workingwiththe74HC595ShiftRegister
The particular shift register you'll be using is the 74HC595 shift register. Take
a look at the pin-out diagram from the datasheet shown in Figure 7-2.
Figure 7-2: Shift register pin-out diagram
Understanding the Shift Register Pin Functions
Following is a breakdown of the shift register pin functions:
Pins Q A through Q H represent the eight parallel outputs from the shift
register (connected to the circles shown in Figure 7-1).
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