Texas Instruments TMS320C2XX - Manual (Page 389)

Transmitter Operation
9-21 Synchronous Serial Port
If the SDTR is loaded with a new word while the transmit FIFO buffer is full, the
new word will be lost; the FIFO buffer will not accept any more than four words.
Continuous mode can be discontinued (changed to burst mode) only by a seri-
al-port or device reset. Changing the FSM bit during transmit or halt will not
necessarily cause a switch to burst mode.
Figure 9–6. Continuous Mode Transmission With Internal Frame Sync
CLKX
XINT
A15 A14 A13 A12 A11 A10 ... A0
LSB MSB
B15 B14 B13 B12
FSX
DX
XSR loaded
from buffer
XSR loaded
from buffer