DSP56303 datasheet(99/292 Pages) FREESCALE

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General-Purpose Input/Output (GPIO)

DSP56303 User’s Manual, Rev. 2

Freescale Semiconductor

5-7

5.5.2 Port C Signals and Registers

Each of the six Port C signals not used as an ESSI0 signal can be configured as a GPIO signal.

Three registers control the GPIO functionality of Port C: Port C control register (PCRC), Port C

direction register (PRRC), and Port C data register (PDRC). Chapter 7, Enhanced Synchronous

Serial Interface (ESSI), discusses these registers.

Figure 5-3. Port C Signals

5.5.3 Port D Signals and Registers

Each of the six Port D signals not used as an ESSI1 signal can be configured as a GPIO signal.

Three registers control the GPIO functionality of Port D: Port D control register (PCRD), Port D

direction register (PRRD), and Port D data register (PDRD). Chapter 7, Enhanced Synchronous

Serial Interface (ESSI), discusses these registers.

5.5.4 Port E Signals and Registers

Each of the three Port E signals not used as an SCI signal can be configured as a GPIO signal.

Three registers control the GPIO functionality of Port E: Port E control register (PCRE), Port E

Figure 5-4. Port D Signals

DSP56303

Enhanced Synchronous

Serial Interface Port 0

(ESSI0)

SC0[0–2]

SCK0

SRD0

STD0

Port C GPIO

PC[0–2]

PC3

PC4

PC5

DSP56303

Enhanced Synchronous

Serial Interface Port 1

(ESSI1)

SC1[0–2]

SCK1

SRD1

STD1

Port D GPIO

PD[0–2]

PD3

PD4

PD5

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