![]() ![]() ![]() When the communication is synchronous, there is an extra line for the clock signal. The common UART (also known as RS-232 or SCI) device found in microcontrollers is asynchronous. In asynchronous data transfer, there is no clock signal for transmission and reception. There are generally two types of serial transmission: asynchronous and synchronous which literally means “not synced” and “synced” respectively. Serial data transmission answers all the above problems, most especially the first one, as cost and limited pins are common issues in microcontroller system design. Crosstalk is also an issue due to the proximity of the wires.It is susceptible to clock skew, which limits the speed of transmission to the slowest of the links.The greater number of wires limit it to shorter transmission distances. ![]() It needs more wires and therefore can be more expensive to implement.Parallel data transmission is faster than serial transmission but with a number of disadvantages: In contrast, parallel communication is where data bits are sent as a whole. Serial communication is the process of transmitting data one bit at a time. 6 Serial with Embedded Linux (Beaglebone Black/Raspberry Pi).
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