DSP56303 datasheet(98/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

5-6

Freescale Semiconductor

Programming the Peripherals

5.5 General-Purpose Input/Output (GPIO)

The DSP56303 provides 34 bidirectional signals that can be configured as GPIO signals or as

peripheral dedicated signals. No dedicated GPIO signals are provided. All of these signals are

GPIO by default after reset. The control register settings of the DSP56303 peripherals determine

whether these signals function as GPIO or as peripheral dedicated signals. This section describes

how signals can be used as GPIO.

Chapter 2, Signals/Connections details the special uses of the 34 bidirectional signals. These

signals fall into five groups and are controlled separately or as a group:

Port B: 16 GPIO signals (shared with the HI08 signals)

Port C: six GPIO signals (shared with the ESSI0 signals)

Port D: six GPIO signals (shared with the ESSI1 signals)

Port E: three GPIO signals (shared with the SCI signals)

Timers: three GPIO signals (shared with the triple timer signals)

5.5.1 Port B Signals and Registers

Each of the 16 Port B signals not used as an HI08 signal can be configured as a GPIO signal.

Three registers control the GPIO functionality of Port B: host control register (HCR), host port

GPIO data register (HDR), and host port GPIO direction register (HDDR). Chapter 6, Host

Interface (HI08), discusses these registers.

Figure 5-2. Port B Signals

DSP56303

Host Interface

(HI08) Port

Non-Multiplexed

Bus

Multiplexed

Bus

Port B GPIO

H[0–7]

HAD[0–7]

PB[0–7]

HA0

HAS/HAS

PB8

PB9

PB10

PB13

PB11

PB12

PB14

PB15

HA1

HA2

HCS/HCS

Single DS

HRW

HDS/HDS

Single HR

HREQ/HREQ

HACK/HACK

HA8

HA9

HA10

Double DS

HRD/HRD

HWR/HWR

Double HR

HTRQ/HTRQ

HRRQ/HRRQ

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