Serial Communication Interface (Sci) - Motorola DSP56309 User Manual

Signal/Connection Descriptions

Serial Communication Interface (SCI)

2.10

SERIAL COMMUNICATION INTERFACE (SCI)

SCI provides a full duplex port for serial communication to other DSPs, microprocessors,
or peripherals such as modems. SCI signal descriptions are listed in Table 2-14.
Signal
Name
RXD Input
PE0 Input or
Output
TXD Output
PE1 Input or
Output
2-32
Table 2-14 Serial Communication Interface (SCI)
State
Type During
Reset
Input
Input
DSP56309UM/D
Signal Description
Serial Receive DataÑThis input receives
byte oriented serial data and transfers it to
the SCI receive shift register.
This signal is driven by a weak keeper after
reset.
Port E 0ÑThe default configuration
following reset is GPIO input PE0. When this
port is configured as PE0, signal direction is
controlled through the SCI Port E direction
register (PRR). The signal can be configured
as an SCI signal RXD through the SCI Port E
control register (PCR).
Serial Transmit DataÑThis signal transmits
data from SCI transmit data register.
This signal is driven by a weak keeper after
reset.
Port E 1ÑThe default configuration
following reset is GPIO input PE1. When this
port is configured as PE1, signal direction is
controlled through the SCI PRR. The signal
can be configured as an SCI signal TXD
through the SCI PCR.
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