Datasheet

14-40 MCF5407 User’s Manual
Operation
Figure 14-39. UART Mode Programming Flowchart (Sheet 2 of 5)
Y
N
CHCHK
PLACE CHANNEL IN
LOCAL LOOPBACK
MODE
ENABLE
TRANSMITTER CLEAR
STATUS WORD
IS
TRANSMITTER
READY
?
WAITED
TOO LONG
?
WAITED
TOO LONG
?
N
Y
SEND CHARACTER
TO TRANSMITTER
HAS
CHARACTER BEEN
RECEIVED
?
CHCHK
TxCHK
SNDCHR
RxCHK
N
YN
SET TRANSMITTER-
NEVER-READY FLAG
SET RECEIVER-
NEVER-READY FLAG
A
B
Y
Y
N