Texas Instruments TMS570LC4357 - Page 1759

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1759
SPNU563A–March 2018
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Serial Communication Interface (SCI) Module
30.7.19 SCI Pin I/O Control Register 6 (SCIPIO6)
Figure 30-28 and Table 30-29 illustrate this register.
Figure 30-28. SCI Pin I/O Control Register 6 (SCIPIO6) [offset = 54h]
31 8
Reserved
R-0
7 3 2 1 0
Reserved TX PDR RX PDR 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 30-29. SCI Pin I/O Control Register 6 (SCIPIO6) Field Descriptions
Bit Field Value Description
31-3 Reserved 0 Reads return 0. Writes have no effect.
2 TX PDR Transmit pin open drain enable. This bit enables open-drain capability in the output pin SCITX, if the
following conditions are met:
• TX FUNC = 0 (SCITX pin is a general-purpose I/O.)
• TX DIR = 1 (SCITX pin is a general-purpose output.)
0 Open drain functionality is disabled; the output voltage is V
OL
or lower if TXOUT = 0 and V
OH
or higher if
TXOUT = 1.
1 Open drain functionality is enabled; the output voltage is V
OL
or lower if TXOUT = 0 and high impedance
if TXOUT = 1.
1 RX PDR Receive pin open drain enable. This bit enables open-drain capability in the output pin SCIRX, if the
following conditions are met:
• RX FUNC = 0 (SCIRX pin is a general-purpose I/O.)
• RX DIR = 1 (SCIRX pin is a general-purpose output.)
0 Open drain functionality is disabled; the output voltage is V
OL
or lower if RXOUT = 0 and V
OH
or higher if
RXOUT = 1.
1 Open drain functionality is enabled; the output voltage is V
OL
or lower if RXOUT = 0 and high
impedance if RXOUT = 1.
0 Reserved 0 Writes have no effect.