Shift register
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A shift register is a type of digital circuit using a cascade of flip-flops where the output of one flip-flop is connected to the input of the next. They share a single clock signal, which causes the
Integrated circuit containing a five-bit, parallel-in/parallel-out shift register (Mitsubishi M74LS96P)
Toshiba TC4015BP dual SIPO shift register
Serial Peripheral Interface
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Serial Peripheral Interface is a de facto standard for synchronous serial communication, used primarily in embedded systems for short-distance wired communication between integrated circuits.
Shift register
…Shift registers are commonly attached to microcontrollers when more general-purpose input/output pins are required than are available, sometimes over a Serial Peripheral Interface in daisy chain configuration, which allows any number of binary devices to be accessed using only two to four pins, though more slowly than parallel I/O. For more outputs, SIPO…
SPI memory by Atmel
Fairchild EEPROM using Microwire
Microchip 32-Mbit SQI flash memory