Freescale Semiconductor ColdFire MCF52210 - Manual (Page 416)

UART Modules
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
24-30 Freescale Semiconductor
Figure 24-25. UART Mode Programming Flowchart (Sheet 2 of 5)
CHCHK
CHCHK
Place Channel In
Local Loopback
Mode
Enable
Transmitter Clear
Status Word
TxCHK
Is
Transmitter
Ready?
Y
N
SNDCHR
RxCHK
Send Character
To Transmitter
Has
Character Been
Received?
N
Y
A
Waited
Too Long?
N
N
Waited
Too Long?
Y
Y
Set Transmitter-
Never-ready Flag
Set Receiver-
Never-ready Flag
B