Serial Communication Interface (Sci) - Motorola DSP56309 User Manual

General-Purpose I/O
Programming Model
5.2.3 Port D Signals and Registers
Each of the six Port D signals not used as a ESSI1 signal can be configured as a GPIO
signal. The GPIO functionality of Port D is controlled by three registers: Port D control
register (PCRD), Port D direction register (PRRD) and Port D data register (PDRD).
These registers are also documented in Section 7ÑEnhanced Synchronous Serial
Interface (ESSI) of this manual.
5.2.4 Port E Signals and Registers
Each of the three Port E signals not used as a SCI signal can be configured as a GPIO
signal. The GPIO functionality of Port E is controlled by three registers: Port E control
register (PCRE), Port E direction register (PRRE) and Port E data register (PDRE). These
registers are documented in Section 8ÑSerial Communication Interface (SCI) of this
manual.
5.2.5 Triple Timer Signals
Each of the three triple timer interface signals (TIO0ÐTIO2) not used as a timer signal can
be configured as a GPIO signal. Each signal is controlled by the appropriate timer
control status register (TCSR0ÐTCSR2). These registers are documented in
Section 9ÑTriple Timer Module of this manual.
5-4 DSP56309UM/D MOTOROLA