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SIRQ
ABRKI
WAS
IRQ CAUSED
BY BEGINNING
OF A BREAK
?
Y
CLEAR CHANGE-IN-
BREAK STATUS BIT
ABRKI1
HAS
END-OF-BREAK
IRQ ARRIVED
YET
?
Y
CLEAR CHANGE-IN-
BREAK STATUS BIT
REMOVE BREAK
CHARACTER FROM
RECEIVER FIFO
REPLACE RETURN
ADDRESS ON SYSTEM
STACK AND MONITOR
WARM START ADDRESS
SIRQR
RTE
Figure 16-31. UART Mode Programming Flowchart (Sheet 4 of 5)
N
N
Chapter 16. UART Modules
INCH
DOES
CHANNEL A
N
RECEIVER HAVE A
CHARACTER
?
Y
PLACE CHARACTER
IN D0
RETURN
Operation
16-35
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