Editing Serial Peripheral Interface (section)

===Expander configurations===
Expander configurations use SPI-controlled addressing units (e.g. [[Binary decoder|binary decoders]], [[Demultiplexer|demultiplexers]], or shift registers) to add chip selects.

For example, one {{Overline|SS}} can be used for transmitting to a SPI-controlled demultiplexer an index number controlling its select signals, while another {{Overline|SS}} is routed through that demultiplexer according to that index to select the desired slave.<ref>{{cite web |date=2001-07-01 |title=Serial-Control Multiplexer Expands SPI Chip Selects |url=http://www.farnell.com/datasheets/312519.pdf |archive-url=https://web.archive.org/web/20190819062018/http://www.farnell.com/datasheets/312519.pdf |archive-date=2019-08-19 |access-date= |website=[[Premier Farnell]]}}</ref>