Serial Communications Interface (SCI)
12 - 8 TMS320F2837xD Microcontroller Workshop - Communications
Serial Communications Interface (SCI)
The SCI is a two-wire asynchronous serial port (also known as a UART) that supports
communications between the processor and other asynchronous peripherals that use the
standard non-return-to-zero (NRZ) format. A receiver and transmitter 16-level deep FIFO is used
to reduce servicing overhead. The SCI transmit and receive registers are both double-buffered to
prevent data collisions and allow for efficient CPU usage. In addition, the C28x SCI is a full
duplex interface which provides for simultaneous data transmit and receive. Parity checking and
data formatting is also designed to be done by the port hardware, further reducing software
overhead.
SCI Pin Connections
Transmitter-data
buffer register
SCI Device #1
SCIRXD
SCITXD SCITXD
SCIRXD
SCI Device #2
8
Receiver-data
buffer register
8
Transmitter-data
buffer register
Receiver
shift register
Transmitter
shift register
8
Receiver-data
buffer register
Receiver
shift register
Transmitter
shift register
8
(Full Duplex Shown)
RX FIFO_0
RX FIFO_16
RX FIFO_0
RX FIFO_16
TX FIFO_0
TX FIFO_16
TX FIFO_0
TX FIFO_16
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