Texas Instruments TMS570LC4357 - Page 1754

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SPNU563A–March 2018
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Serial Communication Interface (SCI) Module
30.7.14 SCI Pin I/O Control Register 1 (SCIPIO1)
Figure 30-23 and Table 30-22 illustrate this register.
Figure 30-23. SCI Pin I/O Control Register 1 (SCIPIO1) [offset = 40h]
31 8
Reserved
R-0
7 3 2 1 0
Reserved TX DIR RX DIR 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 30-22. SCI Pin I/O Control Register 1 (SCIPIO1) Field Descriptions
Bit Field Value Description
31-3 Reserved 0 Reads return 0. Writes have no effect.
2 TX DIR Transmit pin direction. This bit determines the data direction on the SCITX pin if it is configured with
general-purpose I/O functionality (TX FUNC = 0). See Table 30-23 for the SCITX pin control with this bit
and others.
0 SCITX is a general-purpose input pin.
1 SCITX is a general-purpose output pin.
1 RX DIR Receive pin direction. This bit determines the data direction on the SCIRX pin if it is configured with
general-purpose I/O functionality (RX FUNC = 0). See Table 30-24 for the SCIRX pin control with this
bit and others.
0 SCIRX is a general-purpose input pin.
1 SCIRX is a general-purpose output pin.
0 Reserved 0 Writes have no effect.
(1)
TX IN is a read-only bit. Its value always reflects the level of the SCITX pin.
Table 30-23. SCITX Pin Control
Function TX IN
(1)
TX OUT TX FUNC TX DIR
SCITX X X 1 X
General-purpose input X X 0 0
General-purpose output, high X 1 0 1
General-purpose output, low X 0 0 1
(1)
RX IN is a read-only bit. Its value always reflects the level of the SCIRX pin.
Table 30-24. SCIRX Pin Control
Function RX IN
(1)
RX OUT RX FUNC RX DIR
SCIRX X X 1 X
General-purpose input X X 0 0
General-purpose output, high X 1 0 1
General-purpose output, low X 0 0 1