DSP56311VF150 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56311VF150

24-Bit Digital Signal Processor

Motorola => Freescale 

Serial Communication Interface (SCI)

1.11 Serial Communication Interface (SCI)

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

peripherals such as modems.

Table 1-14. Serial Communication Interface

Signal Name Type

RXD

Input

State During

Reset1,2

Signal Description

Ignored Input Serial Receive Data—Receives byte-oriented serial data and

transfers it to the SCI receive shift register.

PE0

TXD

Input or Output

Output

Ignored Input

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

Register.

Serial Transmit Data—Transmits data from the SCI transmit data

register.

PE1

SCLK

Input or Output

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

Register.

Input/Output

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

transmitter and/or the receiver.

PE2

Input or Output

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

Register.

Notes: 1. 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 have weak keepers that maintain the last output state even if the

drivers are tri-stated.

2. The Wait processing state does not affect the signal state.

1-17

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