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.
SPI memory by Atmel
Fairchild EEPROM using Microwire
Microchip 32-Mbit SQI flash memory
Duplex (telecommunications)
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A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in m
Serial Peripheral Interface
…to change their roles on the fly. Motorola's original specification (from the early 1980s) uses four logic signals, aka lines or wires, to support full duplex communication. It is sometimes called a four-wire serial bus to contrast with three-wire variants which are half duplex, and with the two-wire I²C and…
Simplex wireless communication
A simple illustration of a half-duplex communication system