Serial Communication Interface (Sci) - Motorola DSP56303 User Manual

2.10

Serial Communication Interface (SCI)

The Serial Communication interface (SCI) provides a full duplex port for serial
communication with other DSPs, microprocessors, or peripherals such as modems.
Signal
Type
Name
RXD Input
PE0 Input or
Output
TXD Output
PE1 Input or
Output
SCLK Input/Output
PE2 Input or
Output
Note: 1. The Wait processing state does not affect the signal state.
Table 2-14. Serial Communication Interface (SCI)
1
State During
Reset Stop
Input Disconnected
internally
Input Disconnected
internally
Input Disconnected
internally
Signals/Connections
Serial Communication Interface (SCI)
Signal Description
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.
When configured as PE0, signal direction is controlled through
the Port E Directions Register (PRRE).
This signal is configured as RXD or PE0 through the Port E
Control Register (PCRE).
This input is 5 V tolerant.
Serial Transmit Data—Transmits data from SCI transmit data
register.
Port E 1—The default configuration following reset is GPIO.
When configured as PE1, signal direction is controlled through
the SCI PRRE.
This signal is configured as TXD or PE1 through PCRE.
This input is 5 V tolerant.
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.
For PE2, signal direction is controlled through the SCI PRRE.
This signal is configured as SCLK or PE2 through PCRE.
This input is 5 V tolerant.
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