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1701

SCI Control Registers

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29.7.19 SCI Pin I/O Control Register 6 (SCIPIO6)

Figure 29-28 and Table 29-29 illustrate this register.

Figure 29-28. 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 29-29. SCI Pin I/O Control Register 6 (SCIPIO6) Field Descriptions

Bit Field Value Description

31-3 Reserved 0 Read returns 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

or lower if TXOUT = 0 and V

or higher if

TXOUT = 1.

1 Open drain functionality is enabled; the output voltage is V

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

or lower if RXOUT = 0 and V

or higher if

RXOUT = 1.

1 Open drain functionality is enabled; the output voltage is V

or lower if RXOUT = 0 and high

impedance if RXOUT = 1.

0 Reserved 0 Writes have no effect.

1480

Serial Communication Interface (SCI) Module SPNU562–May 2014

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