Microcontroller User's Manual

23-32 MCF5282 User’s Manual MOTOROLA
Operation
Figure 23-26. 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
WA IT ED
TOO LONG
?
N
N
WAI TE D
TOO LONG
?
Y
Y
SET TRANSMITTER-
NEVER-READY FLAG
SET RECEIVER-
NEVER-READY FLAG
B