Enhanced Synchronous Serial Interface 0 (Essi0) - Motorola DSP56303 User Manual

2.8

Enhanced Synchronous Serial Interface 0 (ESSI0)

Two synchronous serial interfaces (ESSI0 and ESSI1) provide a full-duplex serial port for
serial communication with a variety of serial devices, including one or more
industry-standard CODECs, other DSPs, microprocessors, and peripherals that implement the
Motorola Serial Peripheral Interface (SPI).
Table 2-12. Enhanced Synchronous Serial Interface 0 (ESSI0)
Signal
Type
Name
SC00 Input or
Output
PC0
SC01 Input/Output
PC1 Input or
Output
SC02 Input/Output
PC2 Input or
Output
1
State During
Reset Stop
Input Disconnected
internally
Input Disconnected
internally
Input Disconnected
internally
Signals/Connections

Enhanced Synchronous Serial Interface 0 (ESSI0)

Signal Description
Serial Control 0—Functions in either Synchronous or
Asynchronous mode. For Asynchronous mode, this signal is
the receive clock I/O (Schmitt-trigger input). For Synchronous
mode, this signal is either for Transmitter 1 output or Serial I/O
Flag 0.
Port C 0—The default configuration following reset is GPIO.
For PC0, signal direction is controlled through the Port C
Direction Register (PRRC).
This signal is configured as SC00 or PC0 through the Port C
Control Register (PCRC).
This input is 5 V tolerant.
Serial Control 1—Functions in either Synchronous or
Asynchronous mode. For Asynchronous mode, this signal is
the receiver frame sync I/O. For Synchronous mode, this
signal is either Transmitter 2 output or Serial I/O Flag 1.
Port C 1—The default configuration following reset is GPIO.
For PC1, signal direction is controlled through PRRC.
This signal is configured as SC01 or PC1 through PCRC.
This input is 5 V tolerant.
Serial Control Signal 2—The frame sync for both the
transmitter and receiver in Synchronous mode, and for the
transmitter only in Asynchronous mode. When configured as
an output, this signal is the internally generated frame sync
signal. When configured as an input, this signal receives an
external frame sync signal for the transmitter (and the receiver
in synchronous operation).
Port C 2—The default configuration following reset is GPIO.
For PC2, signal direction is controlled through PRRC.
This signal is configured as SC02 or PC2 through PCRC.
This input is 5 V tolerant.
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