Table 2-13 Enhanced Synchronous Serial Interface 1 (Essi1) - Motorola DSP56309 User Manual

Signal/Connection Descriptions
Enhanced Synchronous Serial Interface

Table 2-13 Enhanced Synchronous Serial Interface 1 (ESSI1)

Signal
Name
SC10 Input or
Output
PD0
SC11 Input/
Output
PD1 Input or
Output
2-28
State
Type During
Reset
Input
Input
DSP56309UM/D
Signal Description
Serial Control 0ÑThe function of SC10 is
determined by the selection of either
synchronous or asynchronous mode. For
asynchronous mode, this signal is used for
the receive clock I/O (Schmitt-trigger input).
For synchronous mode, this signal is used
either for Transmitter 1 output or for Serial
I/O Flag 0.
This signal is driven by a weak keeper after
reset.
Port D 0ÑThe default configuration
following reset is GPIO input PD0. When this
port is configured as PD0, signal direction is
controlled through the Port D direction
register (PRR1). The signal can be configured
as an ESSI signal SC10 through the Port D
control register (PCR1).
Serial Control 1ÑThe function of this signal
is determined by the selection of either
synchronous or asynchronous mode. For
asynchronous mode, this signal is the
receiver frame sync I/O. For synchronous
mode, this signal is used either for
Transmitter 2 output or for Serial I/O Flag 1.
This signal is driven by a weak keeper after
reset.
Port D 1ÑThe default configuration
following reset is GPIO input PD1. When this
port is configured as PD1, signal direction is
controlled through PRR1. The signal can be
configured as an ESSI signal SC11 through
PCR1.
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