DSP56307SLASHD datasheet(20/156 Pages) NXP

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1-14

DSP56307 Technical Data

MOTOROLA

Signals/Connections

HI08

Table 1-10

Host Interface

Signal Name

Type

State

During

Reset

Signal Description

H0ÐH7

HAD0ÐHAD7

PB0ÐPB7

Input/

Output

Input/

Output

Input or

Output

Tri-stated

Host Data

ÑWhen the HI08 is programmed to

interface a nonmultiplexed host bus and the HI

function is selected, these signals are lines 0Ð7 of the

data bidirectional, tri-state bus.

Host AddressÑ

When HI08 is programmed to

interface a multiplexed host bus and the HI function

is selected, these signals are lines 0Ð7 of the

address/data bidirectional, multiplexed, tri-state

bus.

Port B 0Ð7

ÑWhen the HI08 is configured as GPIO

through the host port control register (HPCR), these

signals are individually programmed as inputs or

outputs through the HI08 data direction register

(HDDR).

Note:

This signal has a weak keeper to maintain the last state

even if all drivers are tri-stated.

HA0

HAS/HAS

PB8

Input

Input or

Output

Input

Host Address Input 0

ÑWhen the HI08 is

programmed to interface a nonmultiplexed host bus

and the HI function is selected, this signal is line 0 of

the host address input bus.

Host Address StrobeÑ

When HI08 is programmed

to interface a multiplexed host bus and the HI

function is selected, this signal is the host address

strobe (HAS) Schmitt-trigger input. The polarity of

the address strobe is programmable but is

configured active-low (HAS) following reset.

Port B 8

ÑWhen the HI08 is configured as GPIO

through the HPCR, this signal is individually

programmed as an input or output through the

HDDR.

Note:

This signal has a weak keeper to maintain the last state

even if all drivers are tri-stated.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

Not Recommended for New Design

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