DSP56307UM 데이터 시트보기 (PDF) - Motorola => Freescale

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DSP56307UM

24-BIT DIGITAL SIGNAL PROCESSOR

Motorola => Freescale 

Signals/Connections

HI08

Table 1-10 Host Interface

Signal Name

H0ÐH7

Type

Input/

Output

State

During

Reset

Signal Description

Tri-stated

Host DataÑWhen 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.

HAD0ÐHAD7 Input/

Output

Host AddressÑWhen 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.

PB0ÐPB7

Input or

Output

Port B 0Ð7ÑWhen 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).

HA0

Input

Input

Note: This signal has a weak keeper to maintain the last state

even if all drivers are tri-stated.

Host Address Input 0ÑWhen 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.

HAS/HAS

Input

Host Address StrobeÑWhen 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.

PB8

Input or

Output

Port B 8ÑWhen 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.

Not Recommended for New Design

1-14

DSP56307 Technical Data

MOTOROLA

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