SCI Control Registers
1365
SPNU503C – March 2018
Copyright © 2018, Texas Instruments Incorporated
Serial Communication Interface (SCI) Module
26.7.19 SCI Pin I/O Control Register 6 (SCIPIO6)
and
illustrate this register.
Figure 26-28. 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 26-29. 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
Reads return 0. Writes have no effect.