DSP56824 datasheet(13/62 Pages) FREESCALE

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GPIO Signals

DSP56824 Technical Data

2.6 GPIO Signals

Table 11. Programmable Interrupt GPIO Signals

Signal

Name

Signal

Type

State

During

Reset

Signal Description

PB0–

PB7

Input

Output

Input

Port B GPIO

—These eight pins can be programmed to generate an interrupt for

any pin programmed as an input when there is a transition on that pin. Each pin

can individually be configured to recognize a low-to-high or a high-to-low

transition. In addition, these pins are dedicated General Purpose I/O (GPIO) pins

that can individually be programmed as input or output pins.

After reset, the default state is GPIO input.

Table 12. Dedicated General Purpose Input/Output (GPIO) Signals

Signal

Name

Signal

Type

State

During

Reset

Signal Description

PB8–

PB14

Input

Output

Input

Port B GPIO

—These seven pins are dedicated General Purpose I/O (GPIO)

pins that can individually be programmed as input or output pins.

After reset, the default state is GPIO input.

XCOLF

PB15

Input

Output

Input,

pulled

high

internally

XCOLF

—During reset, the External Crystal Oscillator Low Frequency (XCOLF)

function of this pin is active. PB15/XCOLF is tied to an on-chip pull-up transistor

that is active during reset. When XCOLF is driven low during reset (or tied to a

10 kΩ pull-down resistor), the crystal oscillator amplifier is set to a low

frequency mode. In this low-frequency mode, only oscillator frequencies of 32

kHz and 38.4 kHz are supported. If XCOLF is not driven low during reset (or if a

pull-down resistor is not used), the crystal oscillator amplifier operates in the

Default mode, and oscillator frequencies from 2 MHz to 10 MHz are supported.

If an external clock is provided to the EXTAL pin, 40 MHz is the maximum

frequency allowed. (In this case, do not connect a pull-down resistor or drive

this pin low during reset.)

Port B GPIO

—This pin is a dedicated GPIO pin that can individually be

programmed as an input or output pin.

After reset, the default state is GPIO input.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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