ADV
ANCEINFORMA
TION
TMS320F28377S, TMS320F28376S, TMS320F28375S, TMS320F28374S
SPRS881A – AUGUST 2014 – REVISED JUNE 2015
5.10.4 Serial Communications Interface (SCI)
The SCI is a two-wire asynchronous serial port, commonly known as a UART. The SCI module supports
digital communications between the CPU and other asynchronous peripherals that use the standard non-
return-to-zero (NRZ) format
The SCI receiver and transmitter each have a 16-level-deep FIFO for reducing servicing overhead, and
each has its own separate enable and interrupt bits. Both can be operated independently for half-duplex
communication, or simultaneously for full-duplex communication. To specify data integrity, the SCI checks
received data for break detection, parity, overrun, and framing errors. The bit rate is programmable to
different speeds through a 16-bit baud-select register.
Features of the SCI module include:
•
Two external pins:
–
SCITXD: SCI transmit-output pin
–
SCIRXD: SCI receive-input pin
NOTE:
Both pins can be used as GPIO if not used for SCI.
–
Baud rate programmable to 64K different rates
•
Data-word format
–
One start bit
–
Data-word length programmable from one to eight bits
–
Optional even/odd/no parity bit
–
One or two stop bits
•
Four error-detection flags: parity, overrun, framing, and break detection
•
Two wakeup multiprocessor modes: idle-line and address bit
•
Half- or full-duplex operation
•
Double-buffered receive and transmit functions
•
Transmitter and receiver operations can be accomplished through interrupt-driven or polled algorithms
with status flags.
–
Transmitter: TXRDY flag (transmitter-buffer register is ready to receive another character) and TX
EMPTY flag (transmitter-shift register is empty)
–
Receiver: RXRDY flag (receiver-buffer register is ready to receive another character), BRKDT flag
(break condition occurred), and RX ERROR flag (monitoring four interrupt conditions)
•
Separate enable bits for transmitter and receiver interrupts (except BRKDT)
•
NRZ format
•
Auto baud-detect hardware logic
•
16-level transmit and receive FIFO
NOTE
All registers in this module are 8-bit registers. When a register is accessed, the register data
is in the lower byte (bits 7–0), and the upper byte (bits 15–8) is read as zeros. Writing to the
upper byte has no effect.
138
Specifications
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