Serial Communication Interface (SCI)
Table 1-13. Enhanced Synchronous Serial Interface 1 (ESSI1) (Continued)
State During
Reset
Signal Name
Type
Signal Description
SRD1
Input/Output
Input
Serial Receive Data
Receives serial data and transfers it to the ESSI receive shift register. SRD1 is
an input when data is being received.
PD4
Input or Output
Port D 4
The default configuration following reset is GPIO. For PD4, signal direction is
controlled through PRR1. The signal can be configured as an ESSI signal
SRD1 through PCR1.
This input is 5 V tolerant.
STD1
PD5
Input/Output
Input
Serial Transmit Data
Transmits data from the serial transmit shift register. STD1 is an output when
data is being transmitted.
Input or Output
Port D 5
The default configuration following reset is GPIO. For PD5, signal direction is
controlled through PRR1. The signal can be configured as an ESSI signal
STD1 through PCR1.
This input is 5 V tolerant.
1.10 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.
Table 1-14. Serial Communication Interface (SCI)
State During
Signal Name
Type
Signal Description
Reset
RXD
Input
Input
Serial Receive Data
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 SCI Port Directions Register (PRR).
The signal can be configured as an SCI signal RXD through the SCI Port
Control Register (PCR).
This input is 5 V tolerant.
TXD
PE1
Output
Input
Serial Transmit Data
Transmits data from SCI transmit data register.
Input or Output
Port E 1
The default configuration following reset is GPIO. When 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.
This input is 5 V tolerant.
DSP56301 Technical Data, Rev. 10
Freescale Semiconductor
1-19
FREESCALE [ Freescale ]
