DSP56321RMSLASHD datasheet(21/88 Pages) NXP

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Serial Communication Interface (SCI)

1.10 Serial Communication Interface (SCI)

The SCI provides a full duplex port for serial communication with other DSPs, microprocessors, or

peripherals such as modems.

Table 1-13. Serial Communication Interface

Signal Name

Type

State During

Reset1,2

Signal Description

RXD

PE0

Input

Input or Output

Ignored Input

Serial Receive Data—Receives byte-oriented serial data and

transfers it to the SCI Receive Shift Register.

Port E 0—The default configuration following reset is GPIO input

PE0. When configured as PE0, signal direction is controlled

through the Port E Direction Register. The signal can be

configured as an SCI signal RXD through the Port E Control

TXD

PE1

Output

Input or Output

Ignored Input

Serial Transmit Data—Transmits data from the SCI Transmit

Data Register.

Port E 1—The default configuration following reset is GPIO input

PE1. When configured as PE1, signal direction is controlled

through the Port E Direction Register. The signal can be

configured as an SCI signal TXD through the Port E Control

SCLK

PE2

Input/Output

Input or Output

Ignored Input

Serial Clock—Provides the input or output clock used by the

transmitter and/or the receiver.

Port E 2—The default configuration following reset is GPIO input

PE2. When configured as PE2, signal direction is controlled

through the Port E Direction Register. The signal can be

configured as an SCI signal SCLK through the Port E Control

Notes:

In the Stop state, the signal maintains the last state as follows:

• If the last state is input, the signal is an ignored input.

• If the last state is output, these lines maintain the last output state even if the drivers are tri-stated,

because they have internal weak keeper circuits.

The Wait processing state does not affect the signal state.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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