Subject : Embedded Systems Design

Topic : Embedded Serial Communication

Difficulty level : Medium

• It is used for communicating with peripheral devices which are memory mapped to host of the system.
• Host has a parallel bus and control over read/ write.
• Communication through parallel bus is controlled by control signal interface between host and device.
• Control Signals are read or write signals and device select signals.
• Device becomes active by selecting host processor.
• Direction of data transfer are controlled through control signal lines for ‘read’ and ‘write’.
• An address decoder circuit is used for generating chip select signal for the device.
• When the address selected is in the range, chip select line is activated by decoder circuit.
• If device wants to start communication, it can inform the same to processor through interrupts.
• Parallel data communication offers highest speed for data transfer.