DSP56800 datasheet(9/44 Pages) MOTOROLA

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Introduction

DSP56F826 Preliminary Technical Data

EXTAL

CLOCKIN

Input

External Crystal Oscillator Input—This input can be connected to an

4MHz external crystal. If a 4MHz or less external clock source is used,

EXTAL can be used as the input and XTAL must not be connected. For

more information, please refer to Section 3.5.2.

External Clock Input—This input can be connected to an external 8MHz

clock. For more information, please refer to Section 3.5.

The input clock can be selected to provide the clock directly to the DSP core.

This input clock can also be selected as input clock for the on-chip PLL.

EXTBOOT

Input

External Boot—This input is tied to VDD to force device to boot from off-

chip memory. Otherwise, it is tied to ground.

GPIOB0

Input or Output

Port B GPIO—These eight dedicated General Purpose I/O (GPIO) pins can

be individually programmed as input or output pins.

After reset, the default state is GPIO input.

GPIOB1

GPIOB2

GPIOB3

GPIOB4

GPIOB5

GPIOB6

GPIOB7

GPIOD0

Input or Output

Port D GPIO—These eight dedicated GPIO pins can be individually

programmed as an input or output pins.

After reset, the default state is GPIO input.

GPIOD1

GPIOD2

GPIOD3

GPIOD4

GPIOD5

GPIOD6

GPIOD7

Table 3. DSP56F826 Signal and Package Information for the 100 Pin LQFP

All inputs have a weak internal pull-up circuit associated with them. These pull-up circuits are always enabled.

Exceptions:

When a pn is owned by GPIO, then the pull-up may be disabled under software control.

TCK has a weak pull-down circuit always active.

Signal

Name

Pin No.

Type

Description

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