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ABRKI
IRQx CAUSED
BY BEGINNING
OF A BREAK
CLEAR CHANGE-IN-
BREAK STATUS BIT
ABRKI1
END-OF-BREAK
IRQx ARRIVED
CLEAR CHANGE-IN-
BREAK STATUS BIT
REMOVE BREAK
CHARACTER FROM
RECEIVER FIFO
REPLACE RETURN
ADDRESS ON SYSTEM
STACK AND MONITOR
WARM START ADDRESS
SIRQR
Figure 7-10. Serial Module Programming Flowchart (4 of 5)
7-44
Freescale Semiconductor, Inc.
SIRQ
WAS
N
?
Y
HAS
N
YET
?
Y
RTE
MC68340 USER'S MANUAL
For More Information On This Product,
Go to: www.freescale.com
INCH
DOES
CHANNEL A
N
RECEIVER HAVE A
CHARACTER
?
Y
PLACE CHARACTER
IN D0
RETURN
MOTOROLA
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