Texas Instruments MSP430x1xx - Manual (Page 266)

Control and Status Registers
13-20
13.5.6 Transmit Data Buffer UTXBUF
The transmit data buffer (UTXBUF), shown in Figure 13–22, contains current
data for the transmitter to transmit.
Figure 13–22. Transmit Data Buffer UTXBUF
27
7 0
UTXBUF0, 077h
26 25 24 23 22 21 20
rw rw rw rw rw rw rw rw
UTXBUF1, 07Fh
The UTXIFG bit indicates that UTXBUF is ready to accept another character
for transmission. In master mode, the transmission is initialized by writing data
to UTXBUF. The transmission of this data is started immediately if the transmit
shift register is empty.
When seven-bit character-length is used, the data moved into the transmit
buffer must be left-justified since the MSB is shifted out first.