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For instances where the full-duplex nature of SPI is not used, an extension uses both data pins in a half-duplex configuration to send two bits per clock cycle. Typically a command byte is sent requesting a response in dual mode, after which the MOSI line becomes SIO0 (serial I/O 0) and carries even bits, while the MISO line becomes SIO1 and ...
SPI operates in the following way: The master determines an appropriate CPOL & CPHA value; The master pulls down the slave select (SS) line for a specific slave chip; The master clocks SCK at a specific frequency; During each of the eight clock cycles, the transfer is full duplex: The master writes on the MOSI line and reads the MISO line
A full-duplex (FDX) system allows communication in both directions, and, unlike half-duplex, allows this to happen simultaneously. [6] [7] [8] Land-line telephone networks are full-duplex since they allow both callers to speak and be heard at the same time. Full-duplex operation is achieved on a two-wire circuit through the use of a hybrid coil ...
Before signaling will work, the sender and receiver must agree on the signaling parameters: Full or half-duplex operationThe number of bits per character -- currently almost always 8-bit characters, but historically some transmitters have used a five-bit character code, six-bit character code, or a 7-bit ASCII.
full duplex (both devices send and receive at the same time) half duplex (devices take turns transmitting and receiving) For UART to work the following settings need to be the same on both the transmitting and receiving side: Voltage level; Baud Rate; Parity bit; Data bits size; Stop bits size; Flow Control
RS-485, like RS-422, can be made full-duplex by using four wires. [8] Since RS-485 is a multi-point specification, however, this is not necessary or desirable in many cases. RS-485 and RS-422 can interoperate with certain restrictions.
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A unique characteristic of SDLC is its ability to mix half-duplex secondary stations with full-duplex primary stations on four-wire circuits, thus reducing the cost of dedicated facilities. [ 6 ] This de facto standard has been adopted by ISO as High-Level Data Link Control (HDLC) in 1979 [ 4 ] and by ANSI as Advanced Data Communication Control ...