Freescale Semiconductor MCF54455 Reference Manual page 825

UART Modules
ABRKI
Clear Change-in-
Break Status Bit
ABRKI1
Clear Change-in-
Break Status Bit
Remove Break
Character From
Replace Return
Address On System
Stack And Monitor
Warm Start Address
SIRQR
Figure 32-25. UART Mode Programming Flowchart (Sheet 4 of 5)
32-31
SIRQ
Was
N
IRQ Caused
By Beginning
Of A Break?
Y
Has
N
End-of-break
IRQ Arrived
Yet?
Y
Receiver FIFO
RTE
INCH
Does
N
Channel A
Receiver Have A
Character?
Y
Place Character
In D0
Return
Freescale Semiconductor