DSP56303UM View Datasheet(PDF) - Freescale Semiconductor
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Description
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DSP56303UM Datasheet PDF : 108 Pages
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Signals/Connections
1.10 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
Input/Output
Ignored Input
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.
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, the signal is tri-stated.
2. The Wait processing state does not affect the signal state.
3. All inputs are 5 V tolerant.
1-14
DSP56303 Technical Data, Rev. 11
Freescale Semiconductor
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