Motorola MC68328 Technical Information PDF herunterladen (Seite 15)

Hardware Development

FLEX Development Kit

FLEX Alphanumeric Chip MC68175 Interface

2-3

2.1 FLEX DEVELOPMENT KIT

This section briefly describes the following: the FLEX one-way pager development

system; the FLEX Development Kit (FDK), including the FLEX Development Board

(FDB); the receiver; and the MC68328 (Dragonball) Applications Development

Board (ADB).

2.1.1 FLEX Alphanumeric Chip Development Board

The FDB is a decoder module containing the FLEX signal processing decoder IC

combined with a 2-bit floating audio-to-digital converter that is used to decode 4-level

audio signal inputs from the receiver.

The FLEX Alphanumeric Chip IC has eight receiver control lines used for warming up

and shutting down a receiver in stages. The FLEX Alphanumeric Chip also has the

ability to detect a low battery signal during the receiver control sequences. It interfaces

to a host MPU through a standard Serial Peripheral Interface (SPI) and has a 38.4 kHz

clock output capable of driving other devices. Its minute timer offers low-power support

for time-of-day function to the host.

Figure 2-1

illustrates how the FDB interfaces with the receiver and the host

microprocessor. This figure can also be used as a reference design for one-way pagers, or

any other consumer device with paging communication capability.

Figure 2-1

FLEX System Components

SPI

FLEX™

IC Decoder

Audio

API

One-Way Stack

Software

Data

Communication

Receiver

Controls

Analog to

Digital

Converter

Receiver

Host

Microprocessor

AA1418

LCD

FLEX Development Board

Dragonball™

Applications

Development

Board

Chip

Alphanumeric

FLEX

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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