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3-10 FLEX Alphanumeric Chip MC68175 Interface

Software Development

Porting FLEX One-Way Stack to the MC68328 MPU

Figure 3-6 shows how paging messages are received and handled by FLEX One-Way

Stack.

Figure 3-6 Paging Message Received/Handled by FLEX One-Way Stack

3.2 PORTING FLEX ONE-WAY STACK TO THE MC68328 MPU

The FLEX One-Way Stack software is written in the ANSI C language and is therefore

highly portable. However, in order to run FLEX One-Way Stack on a specific

microprocessor, some work is required. After getting the FLEX One-Way Stack software

from Motorola website, product engineers may have to make a few modifications to

enable the FLEX One-Way Stack software to run on the MC68328. This section describes

the recommended steps to assist product engineer to port FLEX One-Way Stack software

to the MC68328 (Dragonball) microprocessor.

Note: The term “FLEXchip” in code comments refers to the FLEX Alphanumeric

Chip MC68175.

Host

Software

Application

FLEX

FLEX Alphanumeric

Interrupt

Handler

Circular Queue

Raw Data

(From Circular Queue)

SPI Communication

Raw Data

(to Storage)

Check For Paging Messages

(Interrupt Timer or Polling)

Paging Message

(Return to Host Software

for Displaying)

AA1425

One-Way

Chip

Stack

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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