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PMIC: CP240x LCD Driver Family Slide 43
Parallel communications requires a wide data bus typically 8 bits or more. The data bits are sent out together in conjunction with a clock and control signals. In contrast, serial data refers to transmitting each bit one after the other over a single wire. This interface allows low pin count devices to be used since only one pin is required to transmit or receive data. The CP2400 and CP2402 devices use a synchronous serial interface called SPI. As shown in the diagram, the synchronous serial interface provides a clock with the data. The transmitter drives data on one edge of the clock and the receiver latches data on the following edge.
PTM Published on: 2011-05-13