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2.10 SCI
The SCI provides a full duplex port for serial communication to 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
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 are tri-stated.
2.
The Wait processing state does not affect the signal state.
Freescale Semiconductor
Table 2-13. Serial Communication Interface (SCI)
State During
1, 2
Reset
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. 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.
Ignored input
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.
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. 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.
DSP56311 User's Manual, Rev. 2
Signal Description
SCI
2-17
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