Datasheet

SCI Control Registers www.ti.com
29.7.12.3 Transmit Data Buffer Register (SCITD)
Data to be transmitted is written to the SCITD register. Figure 29-21 and Table 29-20 illustrate this
register.
Figure 29-21. Transmit Data Buffer Register (SCITD) [offset = 38h]
31 16
Reserved
R-0
15 8 7 0
Reserved TD
R-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 29-20. Transmit Data Buffer Register (SCITD) Field Descriptions
Bit Field Value Description
31-8 Reserved 0 Read returns 0. Writes have no effect.
7-0 TD 0-FFh Transmit data. Data to be transmitted is written to the SCITD register. The transfer of data from
this register to the transmit shift register SCITXSHF sets the TXRDY flag, which indicates that
SCITD is ready to be loaded with another byte of data.
Note: If TX INT ENA is set, this data transfer also causes an interrupt.
NOTE: Data written to the SCITD register that is fewer than eight bits long must be right justified, but
it does not need to be padded with leading zeros.
29.7.13 SCI Pin I/O Control Register 0 (SCIPIO0)
Figure 29-22 and Table 29-21 illustrate this register.
Figure 29-22. SCI Pin I/O Control Register 0 (SCIPIO0) [offset = 3Ch]
31 8
Reserved
R-0
7 3 2 1 0
Reserved TX FUNC RX FUNC Reserved
R-0 R/W-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 29-21. SCI Pin I/O Control Register 0 (SCIPIO0) Field Descriptions
Bit Field Value Description
31-3 Reserved 0 Read returns 0. Writes have no effect.
2 TX FUNC Transfer function. This bit defines the function of pin SCITX.
0 SCITX is a general-purpose digital I/O pin.
1 SCITX is the SCI transmit pin.
1 RX FUNC Receive function. This bit defines the function of pin SCIRX.
0 SCIRX is a general-purpose digital I/O pin.
1 SCIRX is the SCI receive pin.
0 Reserved 0 Writes have no effect.
1474
Serial Communication Interface (SCI) Module SPNU562–May 2014
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