Freescale Semiconductor MCF52277 Reference Manual page 720

UART Modules
CHCHK
CHCHK
Place Channel In
Local Loopback
Mode
Enable
Transmitter Clear
Status Word
TxCHK
Is
Transmitter
Ready?
Y
SNDCHR
Send Character
To Transmitter
RxCHK
Has
Character Been
Received?
Y
A
Figure 30-25. UART Mode Programming Flowchart (Sheet 2 of 5)
30-30
N
N
Waited
Too Long?
N
N
Waited
Too Long?
MCF52277 Reference Manual, Rev. 1
Set Transmitter-
Y
Never-ready Flag
Y
Set Receiver-
Never-ready Flag
Freescale Semiconductor
B