Typewriter User Manual

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7- 44 MC68340 USER’S MANUAL MOTOROLA

WAS

IRQx CAUSED

BY BEGINNING

OF A BREAK

?

CLEAR CHANGE-IN-

BREAK STATUS BIT

HAS

END-OF-BREAK

IRQx ARRIVED

YET

?

CLEAR CHANGE-IN-

BREAK STATUS BIT

REMOVE BREAK

CHARACTER FROM

RECEIVER FIFO

REPLACE RETURN

ADDRESS ON SYSTEM

STACK AND MONITOR

WARM START ADDRESS

RTE

SIRQR

N

Y

N

DOES

CHANNEL A

RECEIVER HAVE A

CHARACTER

?

PLACE CHARACTER

IN D0

N

Y

ABRKI1

ABRKI

Y

INCH

RETURN

SIRQ

Figure 7-10. Serial Module Programming Flowchart (4 of 5)

Frees

cale Semiconductor,

I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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