Serial Communications Interface (SCI)
12 - 12 TMS320F2837xD Microcontroller Workshop - Communications
set when a character is transferred to TXSHF and SCITXBUF is ready to receive the next
character. In addition, when both the SCIBUF and TXSHF registers are empty, the TX EMPTY
flag (SCICTL2.6) is set. When a new character has been received and shifted into SCIRXBUF,
the RXRDY flag is set. In addition, the BRKDT flag is set if a break condition occurs. A break
condition is where the SCIRXD line remains continuously low for at least ten bits, beginning after
a missing stop bit. Each of the above flags can be polled by the CPU to control SCI operations,
or interrupts associated with the flags can be enabled by setting the RX/BK INT ENA
(SCICTL2.1) and/or the TX INT ENA (SCICTL2.0) bits active high.
Additional flag and interrupt capability exists for other receiver errors. The RX ERROR flag is the
logical OR of the break detect (BRKDT), framing error (FE), receiver overrun (OE), and parity
error (PE) bits. RX ERROR high indicates that at least one of these four errors has occurred
during transmission. This will also send an interrupt request to the CPU if the RX ERR INT ENA
(SCICTL1.6) bit is set.
SCI Summary
SCI Summary
Asynchronous communications format
65,000+ different programmable baud rates
Two wake-up multiprocessor modes
Idle-line wake-up & Address-bit wake-up
Programmable data word format
1 to 8 bit data word length
1 or 2 stop bits
even/odd/no parity
Error Detection Flags
Parity error; Framing error; Overrun error; Break detection
Transmit FIFO and receive FIFO
Individual interrupts for transmit and receive
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