Motorola ColdFire MCF5281 - Manual (Page 453)

UART Modules
Freescale Semiconductor 23-33
Figure 23-25. UART Mode Programming Flowchart (Sheet 4 of 5)
Was
IRQ Caused
By Beginning
Of A Break?
SIRQ
ABRKI
N
Clear Change-in-
Break Status Bit
ABRKI1
N
Has
End-of-break
IRQ Arrived
Yet?
Y
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
N
Y
Does
Channel A
Receiver Have A
Character?
INCH
Place Character
In D0
Return
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3