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SCI
2.10 SCI
The SCI provides a full duplex port for serial communication to other DSPs, microprocessors, or
peripherals such as modems.
Table 2-13. Serial Communication Interface (SCI)
Signal
Name
RXD
Input
Type
State During
Reset 1, 2
Ignored input
Serial Receive Data
Signal Description
Receives byte-oriented serial data and transfers it to the SCI receive
shift register.
PE0
Input or Output
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.
TXD
Output
Ignored input
Serial Transmit Data
Transmits data from SCI transmit data register.
PE1
Input or Output
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.
SCLK
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. 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.
Notes: 1.
2.
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.
The Wait processing state does not affect the signal state.
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
2-17
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