Motorola MC68306 User Manual page 149

CLEAR CHANGE-IN-
BREAK STATUS BIT
ABRKI1
CLEAR CHANGE-IN-
BREAK STATUS BIT
CHARACTER FROM
REPLACE RETURN
ADDRESS ON SYSTEM
STACK AND MONITOR
WARM START ADDRESS
Figure 6-10. Serial Module Programming Flowchart (4 of 5)
MOTOROLA
SIRQ
ABRKI
WAS
IRQx CAUSED
N
BY BEGINNING
OF A BREAK
?
Y
HAS
N
END-OF-BREAK
IRQx ARRIVED
YET
?
Y
REMOVE BREAK
RECEIVER FIFO
SIRQR
RTE
MC68306 USER'S MANUAL
INCH
DOES
CHANNEL A N
RECEIVER HAVE A
CHARACTER
?
Y
SAVE IN
SYSTEM BUFFER
RETURN
6-41