Communications Techniques
C2000 Microcontroller Workshop - Communications 13 - 3
Communications Techniques
Several methods of implementing a TMS320C28x communications system are possible. The
method selected for a particular design should reflect the method that meets the required data rate
at the lowest cost. Various categories of interface are available and are summarized in the
learning objective slide. Each will be described in this module.
Synchronous vs. Asynchronous
Synchronous
Short distances (on-board)
High data rate
Explicit clock
Asynchronous
longer distances
Lower data rate ( ≈ 1/8 of SPI)
Implied clock (clk/data
mixed)
Economical with reasonable
performance
C28x
U2
PCB
Port
C28x
PCB
Port
Destination
Serial ports provide a simple, hardware-efficient means of high-level communication between
devices. Like the GPIO pins, they may be used in stand-alone or multiprocessing systems.
In a multiprocessing system, they are an excellent choice when both devices have an available
serial port and the data rate requirement is relatively low. Serial interface is even more desirable
when the devices are physically distant from each other because the inherently low number of
wires provides a simpler interconnection.
Serial ports require separate lines to implement, and they do not interfere in any way with the data
and address lines of the processor. The only overhead they require is to read/write new words
from/to the ports as each word is received/transmitted. This process can be performed as a short
interrupt service routine under hardware control, requiring only a few cycles to maintain.
The C28x family of devices have both synchronous and asynchronous serial ports. Detailed
features and operation will be described next.
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